Genetics of Panicle Exsertion in Cold‐Tolerant Rice (Oryza sativa)

摘要

AbstractFour cold‐tolerant rice varieties, viz. ‘Khonorullo’, ‘Namyi’, ‘Abor B’ and ‘Meghalaya‐1’ were crossed with two cold‐susceptible ones, viz. ‘Pusa 33’ and ‘Subhadra’ (DR92), in all possible combinations to study the inheritance of gene(s) governing panicle exsertion and their allelic relationship among cold‐tolerant varieties. F1hybrids of all the crosses showed complete panicle exsertion indicating dominance of this trait. Segregation pattern of panicle exsertion in F2and backcrosses show that all the four cold‐tolerant varieties possessed a single dominant gene designated asCtr‐1.Absence of segregation for panicle exsertion in an F2generation obtained from intercrosses of cold‐tolerant varieties suggests that the dominant genes