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Showing 2 results for Krishnaveni
Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract
Bacterial leaf blight (BLB) is one of the most devastating diseases of rice (Oryza sativa L.), causing substantial yield losses and posing a serious threat to food and livelihood security across rice-dependent regions of Asia and Africa. In this study, 71 rice genotypes developed through crosses among elite and improved lines, were evaluated for bacterial leaf blight (BLB) resistance using artificial clip inoculation at maximum tillering stage, with resistant (Improved Samba Mahsuri) and susceptible (Taichung Native-1, Krishnaveni) checks, under field conditions at Bapatla and Maruteru, Andhra Pradesh, India. Phenotypic screening identified nine genotypes exhibiting disease reaction towards resistance (disease scores 1–3) at both sites. Molecular screening for five BLB resistance (R) genes, Xa21, xa13, xa5, Xa4, and Xa2, revealed BPT-3170 carried four R genes (xa13+xa5+Xa4+Xa2), while eight genotypes had two genes, and 30 genotypes carried one gene. Phylogenetic analysis using 14 R gene-linked markers grouped the genotypes into three major clusters. BPT-3170 exhibited phenotypic resistance along with multiple R genes, indicating its potential to confer broad spectrum resistance and can serve as a valuable donor in BLB resistance breeding. The study also revealed the breakdown of single-gene resistance and low frequencies of xa5, xa13, and Xa21. These findings highlight the importance of pyramiding multiple R genes to achieve durable resistance against BLB.
Volume 24, Issue 1 (1-2022)
Abstract
Tamilnadu is one of the leading turmeric producing states in India. The turmeric productivity of the state has been declining for the last three years. Many small-scale farmers start shifting turmeric cultivation to other crops due to various reasons that need to be explored. The study has identified the reasons for this shifting among the small-scale farmers where the invading gets doing. Data for this study have been collected from 50 farmers randomly selected from Kanjikoil Village of Erode district using a pre-tested interview schedule. The study reveals that the major causes of shifting turmeric cultivation to other crops are competitive producers from other states (90%), lowering of selling price (88%), lack of technological usage (66%), postharvest losses (72%), higher labour and operation cost (70%), and lack of knowledge on pest control (70%). Based on the results, the feasible recommendations are derived to enhance the turmeric crop growth in the state.