Advances in rice genetics by D S Brar; B Hardy

By D S Brar; B Hardy

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Results indicated that only 32% of the restorers were able to restore complete fertility in hybrids, implying that the restoration is governed by more than one gene. Nearly 14% of the crosses involving new restorers showed significant heterosis over the original hybrid from which they were derived, indicating that heritable genetic factors are responsible for heterosis. The genetic gains in yield and yield stability offered by heterosis have prompted the use of hybrids in several crops. The magnitude of heterosis depends on the choice of appropriate parental lines.

The genetic mechanisms underlying heterosis are largely unknown. We report on the relationship between the distribution of restorers and heterosis and also on the inheritance of genes responsible for heterosis from the heterotic hybrid to its progenies in selfed generations. Materials and methods The materials for the first set of experiments comprised 116 known restorers whose hybrid combinations have been evaluated over the years in national tests in various network centers in India. The 116 restorers were evaluated in the field in a randomized block design during the 1995 and 1996 wet seasons (WS).

The three segregation ratios had a goodness of fit to the expected monogenic (3F:1S), digenic (15F:1S), and trigenic (63F:1S) ratios. Resolution of sterility segregation Four pairs of TGMS near-isogenic lines (NILs) in elite genetic backgrounds were developed and pair-crossed. 61 °C. At heading, some of the panicles in each plant were removed to promote late tiller formation and heading at different dates to meet the condition of different environmental temperatures. Results indicated distinct groups of fertile plants from sterile plants in the F2 populations of crosses UPTRI 95140TGMS/UPRI 95-140NIL, UPTRI 95-141NILTGMS/UPRI 95-141, and UPTRI 95-140TGMS/UPRI 95-141.

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