Genetic assessment of blast resistance in Red × Basmati and Red × White rice crosses under North Hill Zone of India
Keywords:
Blast resistance, chi square test, duplicate gene interaction, red riceAbstract
A total of 11 parent lines and 24 hybrids were assessed for blast resistance at RWRC, Malan during Kharif 2022 and 2023. The experiments were conducted under both field conditions and controlled conditions. Among parents, eight red rice lines were found susceptible for both leaf and neck blast and all the hybrids exhibited resistant reaction due to the presence of dominant resistance genes in three testers utilized in crossing program during Kharif 2022 whereas, during Kharif 2023 the disease incidence was very low in parents as well as in hybrids due to less pathogen load built up as a result of various environmental factors. F2 progenies resulting from ten cross combinations were systematically screened under controlled conditions at Palampur (H.P.) to investigate the genetic inheritance of resistance against blast isolate RML-29. The analysis revealed that genotypes Pusa Basmati 1637 and DHR 9 carried a single blast resistance gene against blast isolate RML-29, while RB 13 possessed two independently segregating blast resistance genes against the same isolate.
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