Variation in Competitve Ability among Rice Varieties (Phylogenetic Differentiation in Cultivated Rice XIX)
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概要
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This paper deals with the results of various competition experiments with rice. The results are summarized below:- 1. Varieties of the Indica or the Continental type generally have higher competitive abilities than those of the Japonica or the Insular type. 2. Among lines derived from hybrids between distantly related varieties, those from bulk propagation of hybrid populations tenaed to have a higher competitive ability than those from pedigree propagation. This indicates that genotypes with high competitive ability increase in hybrid populations. 3. Among hybrid-derived lines, the competitive ability shoeed no significant correlation with various agronomic characters. However, the characters differentiating the Indica and Japonica types were found to be correlated with competitive ability in the way that lines resembling in a character the Indica type tended to have a higher competitive ability than those resembling the Japonica type. This may be explamed by the tendency generally recognizable toward restriction of character recombination in hybrids between distantly related rice varieties. 4. The inheritance of competitive ability in an intervarietal cross was investigated by using Mather's method of partitionin variance components. The results indicate that competitive ability might be controlled by Mendelian genes. 5. An Indica and a Japonica variety were mix-propagated for three generations under different growing conditions. It was found that the competitive ability of one a variety to the other might become higher under conditions rather unfavorable to it. 6. Varieties of the Indica or Continental type showed higher competitive ability or resistance against weeds than those of the Japonica or Insular type.
- 日本育種学会の論文
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