Path-coefficient analysis of rice panicle characters
1989
Mallik, S. | Aguilar, A.M. | Vergara, B.S. (International Rice Research Inst., Los Banos, Laguna (Philippines). Plant Physiology Dept.)
The relationship between high density (HD) grains (those with specific gravity of 1.20 or higher) and other panicle characters could be an effective selection criterion. Fifty panicles from nine parents, 50 panicles from six F1s, and 250 panicles from F2s were studied. HD grain index (HDI) was calculated by dividing the number of HD grains by the total number of spikelets per panicle on primary and secondary branches. Path-coefficient analysis was used to asses the direct and indirect influence of different panicle characters on HDI on primary branches (HDIPB). The number of primary branches and number of spikelets on primary branches had a strong positive association with HDIPB in all generations. Those characters are probably controlled by an additive gene action. The number of secondary branches and of spikelets on secondary branches was correlated positively with HDIPB only in parents; it was not consistent in the F1 and F2 HDI on secondary branches (HDISB) was correlated positively with and had direct effects on HDIPB in both segregating and nonsegregating generations. In most cases, negative correlations and direct and indirect effects were found between HDISB and sterility. Higher HDI depends on more primary branches and more spikelets on primary branches, and not on number of spikelets on secondary branches. A plant type for increased yield should have more primary branches and spikelets on primary branches, with few secondary branches and spikelets on secondary branches.
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