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Morphological observations are made on several populations of Hoplolaimus indicus and Hoplolaimus seinhorsti, recovered from rhizosphere of mango, tamarind, sour orange and sugarcane from the southern regions of Iran. Detailed studies on the two species Hoplolaimus dubius and H. indicus being separated from each other based on some morphological characters, revealed each of them having intra-specific and overlapping variations in morphology and morphometric ranges, enough for not separating two closely related aforementioned species and as a result, H. dubius is considered as a junior synonym of H. indicus. Observations on H. seinhorsti also supported the Siddiqi’s decision on the synonymy of Hoplolaimus sheri with H. seinhorsti. The results of the phylogenetic analyses using D2-D3 expansion segments of 28S rRNA gene were in agreement with the results of previous works, i.e. the classic scheme for assigning species of the genus into two "ancestral" and/or "derived" groups was supported. In phylogenetic trees inferred, using different analysis methods, the Iranian populations of H. indicus were located in the same clade with H. seinhorsti and H. columbus, belonging to "derived" group of species of the genus characterized by having six nuclei in pharyngeal glands, less than four incisures at each lateral field and anteriorly situated position of excretory pore to hemizonid.

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During a survey, five known species of plant-parasitic nematodes of the families Tylenchidae and Dolichodoridae (Tylenchomorpha: Tylenchoidea) were collected and identified from several locations in Golestan, Guilan, Kurdistan, and Fars provinces. Paratrophurus kenanae, Tylenchus elegans and T. ritae, as new records for Iranian nematode fauna, with the two previously reported species Filenchus butteus and Tylenchorhynchus leviterminalis are illustrated and described. The similarity of several species of Paratrophurus with those of the closely related genus, Tylenchorhynchus, is also discussed. 

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In order to identify the plant parasitic nematodes associated with Polianthes tuberosa in Dezful Regions, Iran, 300 soil and root samples were collected from different parts of the region, during 2012-2014. The samples were washed and the nematodes were extracted by centrifugal flotation technique. The nematodes were fixed and transferred to glycerin, and then the permanent slides of the nematode specimen were prepared. After microscopic observation, the measurements (morphological and morphometrical characters) were made using a drawing tube attached to light microscope. In this study, 17 species belonging to nine genera of the family Tylenchidae were identified as: Atetylenchus graminus, A. abulbosus, Basiria aberrans, B. tumida, Boleodorus thylactus, Filenchus elegantulus, F. sandneri, F. vulgaris, F. andrassyi, F. facultativus, Irantylenchus vicinus, Lelenchus leptosoma, Neopsilenchus magnidens, Psilenchus hilarulus, P. iranicus, P. vinciguerrae and Tylenchus capitatus. Among them, A. graminus, L. leptosome and T. capitatus, are new reports and were first described in Iran. This is the first report of male of A. graminus in the world.

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Systemic Acquired Resistance (SAR) as a management strategy for plant parasitic nematode is a state of resistance increased after a previous infection of plant to a biotic pathogen. Induction of SAR is accompanied by local and systemic enhancement of Salicylic Acid (SA). SA increase in plant is concomitant with PR1 expression. We examined the effect of three chemicals including SA, Abscisic Acid (ABA), and DL-β-Amino-n-Butyric Acid (BABA) on the root-knot nematode Meloidogyne incognita on tomato plants. The expression of PR1 genes and 9-Cis-Epoxycarotenoid Dioxygenase (NCED) as markers for SAR and ABA-related activity genes was investigated in growth chamber conditions. Results showed that all elicitors reduced the population of nematode as compared to the control. Shoot length, shoot fresh and dry weight of nematode infected tomatoes pre-treated with BABA increased by 20, 25, and 8 % and number of eggs, galls, egg masses and reproduction factor decreased by 33, 18, 18, and 20%, respectively. All elicitors increased the expression of PR1 and NCED genes in nematode infected tomato. These data suggest that SA, BABA and ABA activate similar defenses in tomato plants, which is partly SA- and ABA-related. SA, BABA, and ABA pretreated tomatoes infected with M. incognita trigger a SAR-response and lead to the control of the nematode under controlled conditions.