Genetic improvement for blast resistance in high-yielding cold-tolerant rice (Oryza sativa L.) cultivar Himalaya 741 by marker-assisted backcross breeding.

ABSTRACT: Blast disease and cold stress are two major yield-limiting factors for rice under temperate climates. Marker-assisted backcross breeding approach (MABB) was employed for the improvement of blast resistance in a popular cold-tolerant variety 'Himalaya741' by introgressing a broad-spectrum resistance locus Pi9 from a Basmati donor PB1637. A combined use of phenotypic selection and marker-based genotypic selection ensured speedy reconstitution of the recurrent parent genome (RPG) in backcross progenies; RPG recovery in most of the progenies was > 96% with three progenies namely, HPU-1-33, -38 and -49 showing complete recovery of recurrent parent genome. Notwithstanding a very higher recovery rate of RPG in introgression lines, the lines still inherited a large linkage block > 13.3 Mb w

SUBMITTER: Rathour R 

PROVIDER: S-EPMC9276897 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature