Abstract
Sclerotinia stem rot is one of the utmost important disease of mustard, causing considerable losses in seed yield and oil quality. The study of the genetic and proteomic basis of resistance to this disease is imperative for its effective utilization in developing resistant cultivars. Therefore, the genetic pattern of Sclerotinia stem rot resistance in Indian mustard was studied using six generations (P1, P2, F1, F2, BC1P1, and BC1P2) developed from the crossing of one resistant (RH 1222-28) and two susceptible (EC 766300 and EC 766123) genotypes. Genetic analysis revealed that resistance was governed by duplicate epistasis. Comparative proteome analysis of resistant and susceptible genotypes indicated that peptidyl-prolyl cis-trans isomerase (A0A078IDN6 PPIase) showed high expression in resistant genotype at the early infection stage while its expression was delayed in susceptible genotypes. This study provides important insight to mustard breeders for designing effective breeding programs to develop resistant cultivars against this devastating disease.
Highlights
India is the fourth largest producer of oilseeds just after the USA, China, and Brazil, accounting for about 19% of the global area and 2.7% of global production [1]
Information regarding the pattern of inheritance as well as the nature of gene action involved in resistance against Sclerotinia sclerotiorum helps crop geneticists and breeders to elect appropriate selection methods for breeding resistant cultivars
Previous studies have revealed that inheritance of Sclerotinia stem rot resistance varies from crop to crop being monogenic in Vicia faba [55] while polygenic in B. napus [23,32]
Summary
India is the fourth largest producer of oilseeds just after the USA, China, and Brazil, accounting for about 19% of the global area and 2.7% of global production [1]. India needs 25 million tons (MT) of vegetable oils, of which merely 10.5 MT is produced domestically. India is the world’s largest consumer and importer of vegetable oils and meets up to 60% of its domestic demand through imports, costing it up to USD 10 billion annually [2,3]. The domestic edible oils demands will increase in the coming years since per capita consumption of vegetable oil is on a steady rise in. The low productivity of oilseed crops is the major reason behind such a huge imbalance between demand and supply of edible oils in.
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