GENOME STRUCTURE OF INTERMEDIATE WHEATGRASS
GENOME STRUCTURE OF INTERMEDIATE WHEATGRASS
复制标题
DOI：
10.1093/oxfordjournals.jhered.a107196
复制
发表时间：
1962-01-01
影响因子：
3.1
通讯作者：
DEWEY, DR
中科院分区：
文献类型：
--
作者：
DEWEY, DR
对源自双生苗的六倍体，2n=42和多单倍体，2n=21，进行细胞学分析以确定该物种的基因组结构。六倍体中间A.在中期I定期形成21个二价体，但也观察到偶尔的四价、三价和单价关联。多单倍体植物中的减数分裂是高度不规则的，其典型特征是单价体、滞后体、桥和片段以及几个减数分裂阶段的省略。多单倍体中中期 I 的染色体关联平均每个细胞有 14.5 个单价、3.1 个二价和 0.1 个三价。六倍体和多倍体植物中的染色体配对关系表明，A. intermedium 是节段同源六倍体，可以用基因组式A1A1A2A2BB 表示。
Hexaploid, 2n=42, and polyhaploid, 2n=21, Agropyron intermedium derived from twin seedlings were analyzed cytologically to determine the genome structure of this species. Hexa-ploid A. intermedium regularly formed 21 bivalents at metaphase I, but occasional quadrivalent,trivalent,and univalent associations were also observed. Meiosis in the polyhaploid plant was highly irregular and was typified by univalents, laggards, bridges, and fragments and by the omission of several meiotic stages. Chromosome associations at metaphase I in the polyhaploid averaged 14.5 univalents, 3.1 bivalents, and 0.1 trivalents per cell. Chromosome pairing relations in the hexa-ploid and polyploid plants indicate that A. intermedium is a segmental autoallohexaploid and may be represented by a genome formula of A1A1A2A2BB.