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Mehta, Samridhi; Dhawi, Faten; Garg, Pooja; Rao, Mahesh; Bhattacharya, R. C; Akthar, Jameel; Yadav, Rashmi; Singh, Mamta; Singh, Kartar; Nallathambi, P; Maheswari, C. Uma; Meena, P. D; Meena, Hari Singh; Rai, P. K; Pant, Usha; Harun, Mohd; Choudhary, Ravish; Matic, Slavica; Gupta, Ashish Kumar
Agronomy (Basel), 04/2023, Letnik: 13, Številka: 5Journal Article
The existing resistance genes against white rust disease are often ineffective due to racial variation of the causal fungal pathogen, Albugo candida. Therefore, new sources of resistance effective against multiple races are needed for durable resistance. Large-scale phenotyping of advanced introgressed (ILs), mutant, and resynthesized (RBJ) lines of Brassica juncea L., under artificial inoculation at cotyledonary and true leaf stages, against thirteen diverse isolates of Albugo candida and simultaneously at the adult plant stage under multi-location field evaluation from 2019-2022, revealed significant differences in white rust reactions. Amongst 194 introgressed lines, three lines, namely ERJ 39, ERJ 12, and ERJ 15, and three lines among 90 resynthesized and 9 mutant lines, including RBJ 18, DRMR 18-36-12, and DRMR 18-37-13, were identified as potential sources of resistance against multiple isolates at all three developmental stages of the plant. Furthermore, correlation and principal component analysis revealed a positive correlation between white rust resistance at true leaf and adult plant stages for ILs as well as mutant and RBJ lines. These novel sources of host resistance will play vital roles are required for the mustard improvement program and to establish a strong genetic and molecular foundation for identifying white rust resistance linked marker(s), QTLs, or gene(s) for sustainable disease management in India.
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