Component analysis of duration from seeding to heading in rice by the basic vegetative phase and the photoperiod-sensitive phase |
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| Authors: | Te-Tzu Chang Cheng-Chang Li Benito S Vergara |
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| Institution: | (1) The International Rice Research Institute, Los Baños, Laguna, Philippines |
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| Abstract: | Summary Inheritance of the duration from seeding to heading in rice was analyzed by dividing the vegetative growth period into the basic vegetative phase (b.v.p.) and the photoperiod-sensitive phase (p.s.p.). Concurrent determination of the two physiologic phases on pure lines and hybrids was facilitated by testing vegetative tillers of the same plant under two photoperiods.In nine crosses of photoperiod-sensitive by insensitive arieties where the parents differed appreciably in b.v.p. estimates obtained under a 10-hour photoperiod, two to three Ef genes of relatively discrete effect controlled the F2 variation in b.v.p. Short b.v.p. was controlled by dominant genes of cumulative but unequal effect. In three other sensitive × insensitive crosses where the parents differed less in b.v.p., the F2 segregation could be ascribed to two to four pairs of metrical alleles with equal or unequal effect.Concurrent data obtained from sensitive × insensitive crosses grown under a 16-hour photoperiod indicate the action of one or two (duplicate) dominant Se genes in controlling strong sensitivity to a long photoperiod. One insensitive variety appeared to carry a recessive inhibitor, i-Se. The Se gene(s) is epistatic to the Ef genes in the expression of earliness under a short photoperiod. Pooled data also suggest an association between photoperiod sensitivity and a short b.v.p. in a large proportion of F2 plants.Field data on the two principal components of the vegetative growth period obtained under natural daylength generally indicated agreement with duplicate plantings grown under controlled photoperiods. Segregation for the optimum photoperiod and critical photoperiod under a changing photoperiod in the field plantings probably resulted in modified expression of the Se and Ef genes.Research supported in part by grant GB-2417 from the U.S. National Science Foundation. |
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