Showing 30 results for Liu
Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract
The practice of English as a medium for learning academic subjects in academic settings is becoming more popular all over the world. However, its application in music in countries where English is not the first language is controversial. Indeed, English Medium Instruction (EMI) is growing promptly in various territories such as the Middle East and North Africa as a part of internationalization. The application of EMI plays a crucial role in improving learners’ English skills and subject matter which can also affect learners’ achievement. The most important predictor of learners’ performance and success is self-efficacy which is also a relevant concept in the area of music performance. Although self-efficacy is significant, its contribution to music learning and academic accomplishment in EMI courses seems critical. Indeed, it should be taken into consideration as it is in direct relation to learners’ academic achievement. As a result, the main objective of this review is to inspect the contribution of self-efficacy to music students’ academic achievement in a context where English is used as the medium of instruction. In a nutshell, the current paper ends up with some suggestions and recommendations to be used by teaching participants in scholastic situations.
Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract
The insight of storage root formation mechanism under different soil compaction which is one of the vital factors affecting storage rot yield is crucial for the high and stable storage yield of sweet potato (Ipomoea batatas L.). Photosynthetic characters has been proved to be determining factor of crop yield. So field experiments were conducted with 2 varieties in control, loose, and compacted soil conditions, canopy apparent photosynthesis, gas exchange parameters and chlorophyll fluorescence parameters of the functional leaves, storage root yield were determined, and the relationship between yield and photosynthetic characters was studied as well. The results indicated compared to the control, the storage root yield was significantly increased in loose soil with the average increase of 27.03%~38.74%, but decreased in compacted soil with the average reduction of 17.87%~15.92%. The CAP got the similar change law. Loose soil also improved gas exchange parameters of functional leaves, overall performance and donor/recipient side properties of PSII, the reverse was found in compacted soil. The CAP was significantly positively correlated with storage root yield (r= 0.99, P<0.05) and single storage root weight (r= 0.90, P<0.05). As per statistical path analysis, the net photosynthetic rate (Pn) had the most total effect and higher direct effect on increasing CAP. That is, reduce the soil compaction increased Pn of functional leaves, brought higher CAP, resulted in high storage root yield.
Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract
Crown rot, caused by Colletotrichum siamense, is a devastating hemibiotrophic fungal disease that poses a significant threat to the strawberry industry. Salicylic acid (SA) is known to play a critical role in plant defense responses to biotic stress. However, its contribution to mitigating strawberry crown rot remains unclear due to the microbial isolate-specific sensitivity and cultivar/tissue-specific responses in strawberries. In this study, we aimed to investigate how exogenous supply of SA influenced crown rot in strawberry. Exogenous SA application significantly reduced C. siamense infection in strawberry crowns, evidenced by the lesion size and pathological analysis. Transcriptomic data showed that for each sample of SA pretreatment and mock, owing to nearly 50 million reads, the ratio of Q20 ranged from 98% to 99%, and 91.63%-94.29% of the reads mapped to the reference genome. The SA pretreatment up-regulated genes encoding MLO-like protein 2, receptor-like kinase, peroxidase, and caffeic acid 3-O-methyltransferase involved in lignin biosynthesis. The SA pretreatment also down-regulated chalcone isomerase, naringenin 3-dioxygenase, bifunctional dihydroflavonol 4-reductase, anthocyanidin synthase, and anthocyanidin reductase expressions involved in flavonoid biosynthesis during C. siamense infection. Consistent with gene expression changes, the SA pretreatment remarkably enhanced peroxidase activity and lignin content and decreased flavonoid content and chalcone isomerase activity after C. siamense inoculation. The results suggest that exogenous SA enhanced strawberry resistance to crown rot caused by C. siamense by up-regulating defense-related genes and lignin biosynthesis.
Volume 0, Issue 0 (9-2025)
Abstract
This study presents the results of a faunistic survey of Trichoptera conducted at four sampling stations in the Ibër River, Kosovo. A total of 22 species from 9 families were recorded, comprising 133 male and 94 female specimens. The most species-rich site was L1, with 11 species, including the first confirmed record of Hydroptila martini Marshall, 1977 in Kosovo. This rare micro-caddisfly, represented by a single male specimen, highlights the importance of the study area for documenting overlooked taxa. Notable findings include the abundance of Rhyacophila nubila Zetterstedt, 1840 at L1, as well as Psychomyia pusilla Fabricius, 1781 and Silo pallipes Fabricius, 1781 at L2, reflecting diverse ecological conditions within the study area. Balkan endemics such as Rhyacophila macedonica Karaouzas, Valladolid & Ibrahimi, 2022 and Ecclisopteryx keroveci Previšić, Graf & Vitecek, 2014 were recorded in low numbers, probably emphasizing the dependence of these two species on water quality. This study emphasizes the importance of increased conservation actions to protect and conserve the vulnerable freshwater ecosystems of Kosovo which support many endemic and rare Trichoptera species.
Volume 5, Issue 1 (3-2016)
Abstract
Rhizoctonia solani is the most serious problem on sugar beet Beta vulgaris L. grown in North Dakota and Minnesota. Picoxystrobin, a quinone outside inhibitor, and penthiopyrad, a succinate dehydrogenase inhibitor, were used alone and in combinations for controlling R. solani AG 2-2 IIIB on sugar beet under greenhouse conditions of 22 ± 2 °C and a 12-h photoperiod. Fungicides were applied in-furrow at planting, followed by inoculation with R. solani grown on barley seeds. The experimental design was a randomized complete block with four replicates and the experiment was repeated three times. Stand counts were taken and roots were evaluated for symptoms using a 0 to 7 scale 21 days after inoculation. Analysis of variance was conducted by the SAS general linear model, and Fisher’s protected least significant difference at α = 0.05 was used to compare treatment means. Fungicides used alone and in mixtures provided effective control of R. solani, which had significantly greater percent survivors than the inoculated check. This research demonstrated that picoxystrobin and penthiopyrad have the potential to be used for providing control of R. solani on sugar beet.
Volume 6, Issue 2 (Spring 2020)
Abstract
Aims: This study aimed to provide more information about the influence of Coronavirus Disease2019 (COVID-19) on infected individuals. The symptoms, conditions, and treatments used may be served as important clues to find out potential medications.
Materials & Methods: Various current papers were reviewed, and the findings were summarized. In addition, other diseases such as severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS), which have similar causes or symptoms in patients, were investigated.
Findings: The most common symptoms in infected patients were fever (98%), dry cough (76%), and dyspnoea (55%). Mechanical ventilation was the main supportive treatment for ICU patients, and the mortality rate of patients with chronic diseases in the intensive care unit (ICU) was high (55%). The virus is highly contagious compared to the previous Betacoronaviruses causing epidemic, but its mortality rate is lower so that most of the infected patients studied had minor symptoms or were asymptomatic. Several treatments, such as antiviral agents and antimalarial drugs, are presently being proposed and tested, but none have yet been proven to be effective.
Conclusions: Seniors and patients with chronic diseases are at higher risk of COVID-19 induced severe consequences and mortality. Currently, supportive treatment is the mainstay for severely ill patients.
Volume 10, Issue 1 (3-2024)
Abstract
This study reports the discovery of Corythucha arcuata (Say), a species previously unrecorded in the Republic of Kosovo. Nine individuals of this species were collected from an Oak tree during the investigation. The findings presented in this study enhance our knowledge of the distribution of C. arcuata within the Balkan region. This discovery underscores the importance of further research to elucidate the factors governing the presence or absence of this species in specific areas. Also, herein we made a list of all known alien-invasive species to Kosovo.
Volume 10, Issue 3 (9-2024)
Abstract
Caddisfly sampling conducted during 2023 in the Bistrica e Shalës River, belonging to the Ibër basin and in the Mirusha River, belonging to the Drini i Bardhë (White Drin) basin, revealed the first record of Stactobiella risi (Felber, 1908) for Kosovo and for Ecoregion 5 (Dinaric Western Balkans). Previously, this species had only been known from few localities in Europe. The morphology of the male genitalia in the collected specimens generally corresponds to the described species, with the exception of a less apically elongated inferior appendages in lateral view, which may be attributed to geographical variability. This discovery increases the knowledge about the distribution of family Hydroptilidae in Kosovo and the Balkans. In addition to this we provide a list of sympatric species in both localities including few rare species such as Hydropsyche botosaneanui Marinković Gospodnetić, 1966 and Rhyacophila macedonica Karaouzas, Valladolid & Ibrahimi, 2022.
Volume 11, Issue 2 (6-2025)
Abstract
In this study, we present new faunistic data on spiders (Arachnida: Araneae) from the Western Balkans. Our findings include the first records of six genera and 23 species for Kosovo: Micaria (2 species), Nomisia (2 species), Allagelena (1 species), Alopecosa (1 species), Ballus (1 species), Cheiracanthium (1 species), Clubiona (1 species), Dipoena (1 species), Enoplognatha (1 species), Eresus (1 species), Hoplopholcus (1 species), Icius (1 species), Mendoza (1 species), Mimetus (1 species), Myrmarachne (1 species), Talavera (1 species), Tegenaria (1 species), Trochosa (1 species), Walckenaeria (1 species), Zodarion (2 species), and Zora (1 species). Additionally, two genera and two species are newly recorded for Albania. One species each is newly recorded for Serbia and North Macedonia. Photographs of the habitus and copulatory organs are provided for all treated species, supporting identification and taxonomic comparisons.
Volume 12, Issue 4 (October & November 2021 2021)
Abstract
One of the concepts of "even", which is the reporter of human experiential work, has been found in the Qurchr('39')an, is to explain its impact on Quranic conceptualizations, hence, among the various roles of the letter, even of attention to the texture and different applications are obtained, the role of which leads to the transmission of a route from the state, position or rank to another state and order. This is described by descriptive-analytic method and by explaining the main and focal meaning of the letter and extraction of verses in which even the abstract concept of "transference" is explained in a metaphorical way, provides a more detailed analysis of the function of this verse in the verses and the basis for constructing this concept, which is shaped by the physical and human experiences, is to illustrate the methodological importance in the more actual interpretation of the Qurchr('39')anic words, including the letters.
1. Introduction
The letter "Hatta" (even) in the Qur'an is used with high frequency to indicate the end of the hypothetical end, and in fact indicates the process of formation of the end point. But in different applications, another meaning is formed around this prototype meaning. Due to the ambiguous nature of the letter "Hatta" (even), this word was chosen as an example to examine its various conceptual maps. The main secondary and peripheral meanings obtained; were metaphorical; That is, due to the local meaning of the letter, "Hatta" (even) in a specific incomprehensible concept is objectively manifested in the destination domain by mapping to the origin domain or illustrated through schemas without occurring mapping of concepts. Accordingly, the first branch of the conceptual network of this letter is the all-meaning branch, which has found semantic commonalities with the two words "when" and "otherwise". The second radial periphery of this letter is the metaphorical secondary meanings, which include "accumulation", "transfer", "cover", etc. The third branch has even taken on the task of schematic design, which depicts volumetric, kinetic, power, and directional schemas that have been examined with Qur'anic evidence.
2. Research purposes
Therefore, the purpose of this article is to discover the semantic periphery of the letter "Hatta" (even) and how it is plotted in the verses of the Qur'an, in this way, a more accurate interpretation of this word is presented in the verses and the shortcomings in understanding the verses are eliminated.
3. Research Questions
The present article seeks to answer the following questions:
1. According to the cognitive approach, how can the sample preview of meaning of the preposition of the letter "Hatta" (even) be explained?
2. Where are the semantic periphery of the letter "Hatta" (even?
3. 3. How are the interpretive omissions of the verses analyzed by determining the semantic radii?
This letter seems to have been used to illustrate the hypothetical end of the process of gradual formation of verb. To pay attention to this letter plays an important role in explaining the more accurate interpretation of the verses in which this letter is used. Therefore, it can be said that the study of this letter gives several meanings that are connected in the meaning of the sample; therefore, it forms a periphery of meanings around the central meaning.
4. Methodology
Regarding the research approach, the researchers' view to obtain the semantic periphery of letters, even in the verses of the Qur'an, is a view that pays attention to the findings of cognitive linguistics. In fact, from the point of view of cognitive linguists such as Lakoff and Johnson, the authors have analyzed the content of verses in which the word has even been used. Regarding the research method, it should be said that the method used in this paper is conceptual analysis. Conceptual analysis is a method that is used to express the meaning and concept of words and phrases, in order to discover the hidden intentions of the speaker behind his statements.
5. Result
According to the studies conducted in the text of the article, the letter "Hatta" (even) in the Qur'an has a central meaning with the concept of a hypothetical end. But the function, even in the applied context of the verses, has not only conceptualized the same meaning, but has also encoded a periphery of other radial meanings by being placed in different structures. Accordingly, the letter even has a periphery of meanings, not a specific meaning. Therefore, sometimes with all the meanings of Ki and Ella, it is included in the inclusive expansion of its meaning, in some cases, it explains metaphorical meanings such as impossibility, result, condition and aggregation, and so on. In this way, by using this letter, a tangible and physical domain is the basis of the abstract domain, so that through this, complex revelatory concepts are brought closer to the audience's mind, in other words, they are in the domain of recognizing them. Finally, a conceptual analysis of letter "Hatta" (even) using the method of cognitive semantics showed that this word sometimes drew schemas such as volumetric, kinetic and power schemas to simplify non-empirical concepts. With the discovery of this semantic periphery, another consequence was the correction of misunderstandings and interpretive tolerances that arose from ignoring the diversity of the conceptual role of this word in Qur'anic expressions.
Volume 15, Issue 3 (5-2013)
Abstract
Due to the complex structure of the pressure-adjusting device used in most sprinklers for variable irrigation, it is not possible to observe the flow behavior of the water passing through the flow field. In this paper, an integral three dimensional (3D) numerical model based on the structural characteristics of the fluidic sprinkler was constructed to simulate the flow field distribution using computational fluid dynamics (CFD). A new type of fluid sprinkler (BPXH) was used in the experiments. The main stream region and the variable velocity regions were clearly distinguished, and the details of the variations in pressure are discussed. The results indicated that the simulation methodology generated sufficient data to analyze the sprinkler pressure and outlet velocity changes. The minimum error of the difference between the simulation and the test pressure values was 0.049, with a maximum of 0.14. The turbulence model could accurately predict the relationship between the outlet velocity and the wetted radius. The outlet velocity ranged from 12.6 to 17.9 m s-1 during the simulation under the variable inlet boundary conditions of the sprinkler. Both the simulation and test values of the wetted radius increased gradually with the sprinkler rotating angle. The absolute error of the simulation and the test ranged from 0.07 to 0.16. Computational fluid dynamics provides a promising tool to help in the design of pressure-adjusting devices using a new type of variable-rate fluidic sprinkler.
Volume 15, Issue 3 (5-2013)
Abstract
Trichosanthes kirilowii, an important economic plant in China, is sensitive to chilling. To investigate the effect of abscisic acid (ABA) treatment on the chilling tolerance of Trichosanthes kirilowii Maxim, different concentrations of ABA were sprayed on Trichosanthes kirilowii leaves and the resulting catalase (CAT) and superoxide dismutase (SOD) activities and the malondialdehyde (MDA) content in the leaves were determined. The results indicated that at 4 ºC, the CAT and SOD activities increased at first and then decreased with increasing ABA concentration. By contrast, the MDA content decreased at first and then increased. They both had an extreme value when sprayed with 5.0 or 7.5 mg L-1 ABA. A real-time polymerase chain reaction was performed to investigate the influence of exogenous ABA on the CAT gene expression of Trichosanthes kirilowii leaves. The results indicated that at 4 ºC, the CAT relative gene expression showed a high degree of positive correlation with the enzyme activities of CAT and SOD, and a negative correlation with MDA content. These results led to three conclusions. First, exogenous ABA exhibits significant effect on the chilling tolerance of Trichosanthes kirilowii. Second, exogenous ABA significantly increases the enzyme activities of CAT and SOD under cold environments. Finally, under cold environments and the effect of ABA, the relative gene expression of catalase 2 (CAT2) gene was found to play an important role in the enhancement of the chilling tolerance of Trichosanthes kirilowii leaves.
Volume 16, Issue 1 (1-2014)
Abstract
A stable Agrobacterium-mediated transformation system was established using bialaphos as the selective agent in soybeans [Glycine max (L.) Merr.]. The cotyledonary node explants of the soybean cultivar ‘NY-1001’ were inoculated with the Agrobacterium tumefaciens strain EHA105, harboring the vector pCAMBIA3301 containing the gus gene as the reporter gene and the bar gene conferring bialaphos resistance. The highest frequency of GUS transient expression (92%) was obtained after inoculation and 4-day co-cultivation with A. tumefaciens strain EHA105. Efficient GUS expression was observed in regenerated shoots from explants after 4-day co-cultivation combined with culturing on shoot induction medium (SIM) without bialaphos for 7 days followed by 4 mg.L-1 bialaphos for 2 weeks. Bialaphos (4 mg.L-1 in SIM; 2 mg.L-1 in shoot elongation medium (SEM)) effectively selected the transformants. The putative transformants and escapes could be exactly distinguished by using a half-leaf GUS assay method to detect GUS expression in the elongated resistant shoots, which resulted in the shortening of culture period for the early detection of transformed shoots. The transformation efficiency of this system was 1.06%. The transgenic plants were verified by polymerase chain reaction (PCR), Southern blotting, and herbicide-resistant responses. All four T0 transgenic plants were fertile and transmitted the phenotypes of both gus and bar in a 3:1 ratio to their progeny. These results indicate that the established system is suitable for further breeding of herbicide-resistant transgenic cultivars, as well as for functional genomics studies of soybeans.
Volume 17, Issue 1 (1-2015)
Abstract
Virtual water adds a new dimension to crop trades and provides a new way of thinking about water scarcity. A systematic analysis of virtual water flows requires integration of all critical drivers of virtual water flows under a single consistent framework. The aim of this study was to assess virtual water flows related to trades of grain crops (wheat, corn, rice, and coarse cereals) and their influencing factors in Hetao irrigation district, China during 1981-2010. Results indicated that: (1) volume of virtual water export decreased from 2.08×109 m3 in 1981 to 1.27×109 m3 in 2010. Volume of virtual water import fluctuated around 621.48×106 m3 during study period; (2) Cultivated area per capita and total population were the major influencing factors for virtual water export in Hetao irrigation district. Volume of virtual water import was mainly influenced by consumption and retail price index of grain crops. Combination of large volume of virtual water export and severely constrained water resources confronted Hetao irrigation district with great challenges in its sustainable development. Decreasing virtual water export is a mean to alleviate regional water shortage pressure, and may be achieved by measures that constrain continued population expansion.
Volume 17, Issue 3 (5-2015)
Abstract
This study was conducted to determine the effects of the combined use of rain shelters (RS) and deficit irrigation (DI) on tomato yield and quality characteristics. Two experiments with different treatments were conducted in the southern China during the growing season in 2011 and 2012. The crops were irrigated to field capacity once average soil water content at the 0-60 cm layer in the treatment decreased to 80% of field capacity under open-field (T1, the control) and RS (T2), and 30, 40, and 50% decreased water of T2 as treatments T3, T4, and T5, respectively. The results showed that T2 increased the yield and irrigation water use efficiency (IWUE) by 13 and 11.5% in the two years, and improved fruit firmness (FF), total soluble solids (TSS), soluble sugar (SS), and vitamin C (VC) compared to T1. Under RS conditions, DI reduced the yield, but increased IWUE of tomato relative to T2 from 25 to 52% in 2011, and from 26 to 41% in 2012. The effects of DI on fruit quality were generally the inverse of those on fruit yield. FF, TSS, SS, VC, organic acid, and color index were positively affected by DI. With regard to the rank of comprehensive quality index (CQI) calculated by the analysis hierarchy process and modified technique for order preference by similarity to an ideal solution, it exhibited good fitness to the rank of single quality attributes. The highest CQI was obtained in treatment T4 in 2011, and T3 in 2012.
Volume 17, Issue 4 (7-2015)
Abstract
To clarify the underlying physiological mechanism of gibberellic acid (GA) in cold tolerance, the effects of exogenous GA3 on malondialdehyde (MDA), osmoregulation substances and endogenous hormones levels in the tiller nodes of two wheat cultivars, namely, Dongnongdongmai 1 (a cold insensitive cultivar) and Jimai 22 (a cold sensitive cultivar), were investigated at three periods of cold winter (0, -10, -25°C). The results showed that low concentrations of GA3 (0.1 and 1 µM) decreased the endogenous GA concentration in both cultivars, but only increased the abscisic acid (ABA)/GA ratio in Dongnongdongmai 1. High concentrations of GA3 (10 and 100 µM) increased the MDA level, retarded the accumulation of soluble protein and sugar in both cultivars, but decreased the content of ABA and the ratio of ABA/GA only in Dongnongdongmai 1 and had no influence on those in Jimai 22. The re-greening rate of Dongnongdongmai 1 decreased as the concentration of exogenous GA3 increased. Correlation analyses showed that MDA was negatively correlated with re-greening rate, while soluble protein, sugar ABA content, and ABA/GA ratio were positively correlated with re-greening rate. In conclusion, low exogenous GA3 level could decrease endogenous GA content and elevate ABA/GA ratio and soluble protein content, which help to improve cold tolerance. However, high exogenous GA3 level decreased the ABA content and ABA/GA ratio, resulting in lower soluble sugar and protein content and aggravated oxidative damage, and finally weakened cold tolerance. The endogenous GA metabolism and ABA/GA balance play central roles in exogenous GA3 mediated cold tolerance.
Volume 17, Issue 6 (11-2015)
Abstract
In this study, the milk-derived GalactoOligoSaccharides (GOS) were produced by Lactobacillus delbrueckii subsp. bulgaricus and refined by an ultrafiltration-nanofiltration continuous membrane. By further investigation, we found that the GOS product purified by gel permeation chromatography mainly contained low molecular weight disaccharide and trisaccharide, that is, 4-β-galactobiose and tri-galacto-oligosaccharides. The cellular immune activity of the purified GOS was evaluated by using Intestinal Epithelial Cells (IECs). Results showed that GOS could significantly (P< 0.05) promote IECs proliferation in a dose and time dependent manner, and the relative proliferation rate after 24 hours culture was high up to 158% at the concentration of 100 μg mL-1, which was three time the value after 4 hours culture without GOS. Moreover, the production of IL-6 was observably increased and up to 133.54 ng L-1 with addition of 100 μg mL-1 GOS. These data implied that the purified GOS might have a role in promoting the immune adjustment, which could be utilized as a novel and natural immunoregulatory agent in the field of medicine and functional food. This work also revealed that the employment of transgalactosylation activity of β-galactosidase derived from the fermentation of probiotics such as Lactobacillus delbrueckii subsp. bulgaricus would enhance the value of the milk product due to the form of GOS.
Volume 17, Issue 7 (Supplementary Issue - 2015)
Abstract
A four-year field experiment was conducted to understand the characters of nutrient accumulation and distribution in maize under different yield levels, so as to provide scientific guidance for effective utilization of mineral fertilizers, and eventually for high yield of spring maize. The grain yield, nutrient (nitrogen, phosphorous, potassium) accumulation and uptake efficiency were evaluated under different agronomic managements and nitrogen application treatments. The data showed that the two-year average grain yield under high Yield Management (HY) was significantly increased by 35.3% as compared with Traditional Farming management (FP). Interestingly, the increased range of grain yield may be associated with harvest ear numbers, indicating that high planting density could lead to high maize production. Moreover, the total amounts of nitrogen, phosphorous and potassium in maize significantly increased and the ratio of accumulation after flowering was also improved under HY management. Our results suggested that the high grain yield and nutrient use efficiency would ultimately be achieved through integrating and optimizing high yield cultivation techniques, which not only improve biomass and harvest index, but also promote the growth and nutrient accumulation of maize.
Volume 18, Issue 2 (3-2016)
Abstract
Paris polyphylla Smith var. yunnanensis (Liliaceae) is an important traditional medicinal plant of the Yunnan Province in China. However, the genomic information regarding this plant is limited. To further understand its molecular background, we conducted Illumina HiSeq 2000 second-generation sequencing of this plant species. Approximately 30,198,679 reads with an average length of 202 bases were obtained from its root cells. These reads were assembled into 56,095 unique sequences and approximately 49.7% of the unique sequences were annotated by Basic Local Alignment Search Tool (BLAST) similarity searches against public sequence databases. Most of these unigenes were mapped to carbohydrate metabolism, energy metabolism, and secondary metabolite biosynthetic pathways. Additionally, 3,853 EST-SSRs were identified as potential molecular markers in our unigenes. Of these, 9 nuclear SSR markers were employed to assess genetic diversity and structure of 11 geographically disjunct populations. The present study revealed a moderate genetic diversity (He= 0.527) and low genetic differentiation (Fst= 0.103), which may be ascribed to an earlier period of more pronounced gene flow when the species had a more continuous distribution. The 11 studied populations were divided into two clusters based on the UPGMA dendrogram, which were not congruent with their geographical distributions. Overall, the root transcriptome sequences generated in this study reveal novel gene expression profiles and offer important clues for further study of the molecular mechanism of Paris’ root secondary metabolite synthesis and population genetics. The EST-SSR markers identified will also facilitate marker-assisted selection in Paris breeding.
Volume 18, Issue 3 (5-2016)
Abstract
Five demersal trawl surveys were conducted in the Pakistani waters in October, November 2009 and August, October, November 2010. A total of 819 length-weight and 7,240 length-frequency data of Atrobucca alcocki were collected, the length ranged from 10 cm to 45 cm with the dominant length group from 19 to 29 cm. The total weight ranged from 14 to 928 g. The length-weight relationship can be expressed as W= 0.012*L2.925 (R2= 0.972). Using the ELEFAN program in FiSAT computer package, the calculated von Bertalanffy growth function parameters were = 47.25cm, K= 0.180 yr-1. Total mortality (Z) was computed using the length-converted catch curve analysis at Z= 1.07 yr-1. Natural mortality was computed as M= 0.494 yr-1 at an annual average sea surface temperature of 26°C, hence, the fishing mortality was computed as F=Z-M= 0.576 yr-1. The Exploitation ratios (E) were computed as Emax = 0.421, E10 =0.355, E50 =0.278. Yield per recruit analysis revealed that when tc was assumed to be 2, Fmax was calculated at 0.75 and F0.1 at 0.6. When tc was assumed to be 1, Fmax was calculated at 0.55 and F1.0 at 0.45. Current age at first capture was about 1 year and Fcurrent was 0.576, therefore, Fcurrent was larger than F0.1 and Fmax. When biological reference point was Fopt equal to M (0.494), current fishing mortality rate of 0.576 was larger than the target biological reference point.