STUDIES ON SCREENING AND GENETICS OF WIDE COMPATIBILITY IN RICE (ORYZA SATIVA L.)

Abstract

The hybrids of intersubspecific crosses involving indica (I) and japonica (J) rices show semisterility, while those with wide compatible varieties (WCVs) show normal fertility. A set of 42 varieties representing four varietal groups were evaluated in two diverse environments in testcrosses with three indica and japonica testers each for wide compatibility trait and its inheritance. and relationship with the marker gene in four newly identified varieties were studied. Twelve varieties were identified as compatible, two intermediate and 28 narrow compatible varieties. Inheritance of WC in RP 1579-1704-1318, UPR 1279-1-4-1, Pusa 560-2-203-338 and UPRI-95-170 was controlled by single gene with dominance of wide compatibility over narrow compatibility. Wide compatibility gene (S~ ) showed loose linkage with chromogen (C+) gene on chromosome 6 with a recombination value of 34.2%.