水稻染色体片段的定向重复

水稻染色体片段的定向重复 THE STUDIES REPEATING A GIVEN CHROMOSOMAL SEGMENT IN RICE 张廷璧 Zhang Tingbi 1 first-author 武汉大学生物系 武汉大学生物系 Department of Biology, Wuhan University Department of Biology, Wuhan University 本研究发现水稻初级三体（2n+1）在繁殖过程中出现个别二倍体植株带有特定染色体片段重复的现象,这为定向重复染色体片段,进而定向重复基因位座奠定了基础。由于特定染色体片段重复,出现了大穗、大粒,叶内卷等性状,为构建产量性状基因群探明了道路。 Chromosomal fusion and fission are sometimes called "Robertsonian ch-anges"。 These studies discovered that a duplication of a given chromosomal seg-ment could regularly appear in a few diploid !plants derived from a giventrisomic. The observation of chromosomes at paehytene stage showed that the ch-romosomes with repetitive segment were longer than ones without repetitive segment in common diploid and have more chromomeres. The observation of morphology also showed that the diploid with repeti-tive segment of chromosome-5 had fine hairs on surface of leaf analogy to triplo-5, the diploid with repetitive segment of chromosome-8 had rolled leaf analogy to triplo-8, the diploid with repetitive segment of chromosome-9 had big grains analogy to triplo-9 and the diploid with repetitive segment of ch-romosome-12 appeared a great increase of spikelets per panicle analogy to triplo-12. This phenomenon showed that constructing gene groups of yield traits could be realized by duplication of a given chromosomal segment or genelocus. 初级三体 部分同源配对 染色体片段重复 primary trisomic partial pairing of homo-chromosome duplication of chromosomal segment 国家自然科学基金(61672102);国家科委资助的课题 1989-02-01 2021-04-01 2