Inheritance of tillering ability in three crosses of upland [rice] varieties [in Senegal].
1987
Faye A. | Gningue M. | Mane O.
Tiller number at 40 d after seeding (DAS) is indicative of the early growth vigor essential to an early-maturing genotype. Allelic relationships, estimates of heritability, and residual heterosis were studied for number of tillers at 40 DAS in 3 F2 populations of crosses with upland rice varieties that included traditional Abdoulaye Mano, and Barafita from Senegal. In all F2 populations, heritability exceeded 50% for the character studied. In the IR 12624-65-2/IRAT 144 F2, more plants showed tiller numbers closer to the IR12624-65-2 parent, which has the higher tillering potential, than to the IRAT 144 parent. The distribution of F2 plants was bimodal. Adjusting observed data to the theoretical level for 1 gene segregation (75-25%) gives a highly significant X square. In IRAT 144/Abdoulage Mano, environmental variance undoubtedly contributed to the continuous variation in the F2 plants, which corresponds to parental values. The weak expression of the tiller number character seems to influence moderate tiller number most. This explains why the residual heterosis was negative. In the IRAT 144/Barafita F2, tiller numbers at 40 DAS varied continuously. Data could not be used to test goodness of fit with expected segregation ratio. The distribution skewed more toward higher tiller numbers than it did in Barafita.
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