1Division of Genetics, Indian Agricultural Research Institute, New Delhi-110 012.
2NRC on Plant Biotechnology, Indian Agricultural Research Institute, New Delhi-110 012.
*Author for Correspondence: E-mail: dkygenet@gmail.com
White rust, caused by Albugo candida is one of the major diseases of Indian mustard in India, causing heavy yield losses ranging from 17 to 34%. The breakdown of resistance is the prime concern to search for new genes to develop a durable resistance against white rust in mustard. A stable donor Bio-YSR (INGR No. 04099) has been developed indigenously, which need genetical characterization. Bio-YSR, the resistant donor germplasm line was crossed with popular, widely grown and high yielding susceptible cultivars Varuna and Bio-902 (Pusa Jai Kisan), to study the mode of inheritance of white rust resistance gene. The F1 plants of these crosses were resistant indicating the dominant nature of the resistance. The segregation pattern in F2 of the crosses fits well in 3 resistant (R): 1 susceptible (S) ratio indicating Bio-YSR carries a single dominant gene. This monogenic dominant nature was confirmed from the results of backcross populations as well. Hence, the major gene governing white rust resistance in the indigenous germplasm line Bio-YSR, will be of immense use in breeding for durable resistance by the way of diversification of resistant sources and gene pyramiding.
Indian mustard, Indigenous germplasm, Inheritance, Resistance, White rust
