Genetic Relation Between an Earliness Gene Ef-1 and Anther Length in Rice, Oryza sativa L..
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概要
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An isogenic line of Taichung 65 harboring the earliness gene Ef-1 (T65 · ER-1) produced short anthers compared with those of Taichung 65 (T65). To examine the genetic relation between the Ef-1 gene and the anther length, a linkage analysis was performed using F2 plants of a cross, T65 · ER-1/T65, and BIFI plants of the crosses, T65 -ER-1/T65//T65 · ER-1 and T65 · ER-1/T65//T65. Since the anther length was affected by the temperature, segregation of the anther length was examined basing on the ranges of the anther length of two lines, T65 and T65 ·ER-1, and their F1 hybrids, collected during the same period. The results showed that the anther length was controlled by a single gene, and that the short anther trait was incompletely dominant over the long one. No recombinants with early heading and a long anther or with late heading and a short anther segregated in the 973 BIFI Individuals of the cross, T65 · ER-1/T65//T65 and 487 F2 plants. It was, then, concluded from the BIFI data that the recombination value between a gene shortening the anther length and the Ef-1 gene did not exceed 0.5 %, assuming that the anther length is controlled by a gene different from Ef-1 Smaller recombination values than 0.5 % were reported in rice. Consequently, it is possible that the gene that shortens the anther length is present and tightly links with the Ef-1 gene. However, it is also possible that the effect of the Ef-1 gene on the shortening of the anther length is pleiotropic. It was, then, deemed important to identify new earliness genes that do not shorten the anther length for the improvement of the cool tolerance capacity at the booting stage, because it was considered that anther length was positively correlated with the degree of tolerance.
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