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作 者 ：黄瑞复 虞泓

期 刊 ：云南植物研究 1996年 18卷 S8期 页码：1-3

关键词：韭；育性；子代；核型；整倍性变异；

Keywords:Allium tuberosum,

摘 要 ：自然三倍体韭预期的育性仅为1／8192，但实际育性为1／5882，比预期的高。在其子代中可发现有染色体数为16，24和32的个体，其核型公式分别为:2n=2x=16=14m＋2st（SAT）；2n=3x=24=21m＋3st（SAT）；2n=4x=32=28m＋4st(SAT)。3种倍性出现的比数为：13个二倍体：20个三倍体：12个四倍体，这与预期比数1：2：l相符合。表明自然三倍体韭是同源三倍。

Abstract:Euploidic variation in filial generation of spontaneous triploid Allium tuberosum Rottler ex Spreng. was studied in this paper. Spontaneous triploid A.tuberosum is highly sterile because of the difficulties involved in chromosome pairing and disjunction during meiosis. Its ex-pected value of fertility is only 1/8192, but the practical value of fertility is 1 / 5882. It is higher than its expected one. The plants in filial generation of the triploid with a basic haploid number of 8, have members with chromosome numbers of 16, 24 and 32. The karyotypes of these plants were analysed. Their karyotype formulas are 2n = 2x = 16 = 14m + 2st(SAT), 2n = 3x = 24 = 21m + 3st(SAT), 2n=4x=32=28m + 4st(SAT). They are diploid, triploid and tetraploid respectively, and have become a euploidic series. Three kinds of euploid are in a ratio of 13 diploids: 20 triploids: 12 tetraploids. It approximately coincides with expected ratio of 1: 2: 1. It is proved that this spontaneous triploid A. tuberosum is an autotriploid.

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