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題名 | 稻品種臺中65號種子經X-射線誘發之早抽穗基因Ef-1 的研究 |
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作者姓名(中文) | 張素華; 胡念臺; 蔡國海; | 書刊名 | 農林學報 |
卷期 | 44:4 1995.12[民84.12] |
頁次 | 頁19-29 |
分類號 | 434.114 |
關鍵詞 | 稻; 誘發早抽穗性基因; 複合構造; 同源基因系; Rice; Induced early-heading gene; Compound structure; Isogenic lines; |
語文 | 中文(Chinese) |
中文摘要 | �瓟_品種臺中65號種子經X-射線照射誘變之早抽穗系統(O)E�k具誘發之顯性早 抽穗基因 Ef-1 �k(屬於第 10 染色體)。 此突變體繼續回交臺中 65 號 9 次育成同源基 因系 (9)E �k。 (O)E �k系統較臺中 65 號早抽穗約 12 日,減短株高約 8cm,而 (9)E �k 系統早抽穗 7 日,短稈 14cm。經估計 Ef-1 �k基因座具誘發之 2 個遺傳單位,其中 1 個 單位早抽穗作用大,另 1 個較弱。複合構造性質之 Ff-1 �k基因座經回交 9 次,除去部分 Ef-1 �k基因結果減弱早抽穗作用,惟強化對株高之多效性作用。(9)E �k與 (O)E �k系統間 雜種 F �祟煻J期產生遺傳的變異可能肇因於 Ef-1 �k基因座內之相互作用, 本雜種分離出 隱性 ef-1 表現型後裔,可能係遺傳單位之間產生重組現象所致。 (9)E �k系統與其他回交 多次 Ef-1 系統間早抽穗性作用或若干性狀間之表現相似,表示經多次回交結果,此等系統 間 Ef-1 基因之純質程度已相當高。 |
英文摘要 | The Ef-1 locus has several dominant isoalleles, which locates on the 10th chromosome. One of them, the Ef-1 �k -gene was carried in a mutant, T65(O)Ef-1 �k [(O)E �k ], obtained from an X-rayed seed of a rice variety, Taichung 65 carrying the recessive allele, ef-1. The original mutant, (O)E �k ,was backcrossed by T65 nine times and an isoline, T65 (9)Ef-1 �k [(9)E �k ],was established. The (9)E �k - line has lower heading advancing effect, but stronger pleiotropic effect on shortening height than those of the (O)E �k -line. The induced Ef-1 �k locus probably has a compound structure with two estimated-units of effective factors for early-heading. The (9)E �k -line showed the similar early-heading behavior as those shown in other E-lines established by additional backcrosses indicating that these lines had the purified Ef-1 alleles in common. An amount of genetic variance (V �I�� >V ) for heading behavior was found in the F �� of a cross, (9)E �k x (O)E �k. Such genetic variance was presumably produced as a result of allelic interaction within the Ef-1 �k -locus. Moreover, T65-like plants (ef-1 like offtype) were occurred from the above cross combination, suggesting the possibility of intralocus recombination. |
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