Rust resistance and inheritance pattern to stripe and leaf rust in elite wheat germplasm from North Hills of India
Wheat crop is attacked by three rust diseases of which stripe rust, caused by Puccinia striiformis f. sp. tritici and leaf rust, caused by Puccinia triticina, are the most common causing greater yield losses. Thirty genotypes were studied for (APR) adult plant resistance and were evaluated in field conditions and controlled conditions. HPW 373, VW 20145, VL 3002, RKVY 231, VL 907, PBW 698 and HS 507 were found to be highly resistant to yellow rust at both seedling and adult plant stages. While, genotypes HS 490, HPW 314, HPW 360, RKVY 133, Raj 4362, DBW 113 and HPW 403 showing very low AUDPC values were found to be moderately resistant under field conditions. These lines are suggested for use in breeding program and some are in network trials for their direct release. Inheritance studies were carried out to decipher the genetics of seedling rust resistance in elite germplasm line HPW 373. The F2s were evaluated for seedling resistance against yellow rust (46S119, 78S84) and leaf rust (77-5-North American equivalent THTTM) races. Resistance in HPW 373 is controlled by single dominant gene against leaf rust (77-5) and stripe rust (78S84). Against stripe rust (46S119), resistance of HPW 373 is controlled by recessive gene. The findings are expected to contribute towards enriching diversity for leaf and stripe rust resistance in bread wheat improvement programmes.