Genetic Enhancement and Genetic Analysis of Resistance to Asian Soybean Rust in India

Abstract

Background: Asian soybean rust caused by PhakopsorapachyrhiziSyd. is a major threat for production and expansion of soybean in India. Understanding the nature of inheritance of rust resistance in DSb 21 will help in estimating the number of genes involved in governing the resistance mechanism and thus will be helpful in designing a suitable breeding method. Methods: Utilizing JS 335 and EC 241778, in a long term breeding programme, a highly rust resistant variety, DSb 21 has been released from University of Agricultural Sciences Dharwad, Karnataka. To study the genetics of rust resistance in DSb 21, F2 and F3 generation of two crosses involving susceptible x resistant (JS 335 x EC 241778) and resistant x susceptible (DSb 21 x JS 335) were used. Result: The F2 segregation analysis in both the crosses revealed the same segregation ratio of three resistant to one susceptible phenotype based on chi square test indicating rust resistance is controlled by a single dominant gene. In both the crosses the F2 results were confirmed by studying the F3 progenies for reaction to rust.

Understanding Phakopsora pachyrhizi in soybean: comprehensive insights, threats, and interventions from the Asian perspective

“…In another study conducted during the Kharif season of 2008 in Dharwad, India, 84 soybean genotypes were tested for ASR resistance in natural epiphytic environments, and these two germplasm lines (EC-241778 and EC-241780) were found as resistant genotypes ( Khan and Tyagi, 2013 ). However, the first rust-resistant cultivar developed in India is DSb 21 (JS 335 × EC 241778), which was developed by the University of Agricultural Sciences, Dharwad, and released in 2015 ( Immadi et al, 2022 ). Apart from demonstrating resistance to ASR, DSb 21 also yields 10–12% more than the popular cultivar JS 335.…”

“…True color and false color multiband imagery of soybean field developed to create crop health index, and spectral curve for healthy and Asian soybean rust diseases canopy at BSMRAU experimental field. Hossain et al 10.3389/fmicb.2023.1304205 Frontiers in Microbiology 12 frontiersin.org released in 2015 (Immadi et al, 2022). Apart from demonstrating resistance to ASR, DSb 21 also yields 10-12% more than the popular cultivar JS 335.…”

Influence of Bioformulations on Productivity, Profitability and Quality in Soybean under Rainfed Condition of Northern Transition Zone of Karnataka

“…Soybean is mainly grown for their seeds and it is the second largest oil seed after groundnut in India. Soybean seeds contain 43.2% protein, 19.5% fat, 20.9% carbohydrate and a good amount of other nutrients like calcium, phosphorus, iron and vitamins (Gupta et al, 2003 andImmadi et al, 2021). In India it is grown over an area of 11.44 million hectare with a production of 12.04 million ton nes an d average p roductivity of 10 50 kg ha -1 (Anonymous, 2022).…”