Lin Y J
Cytobios. 1980;27(106):113-28.
Rhoeo spathacea var. variegata is unusual in that its twelve chromosomes are arranged in a ring at meiosis. The order of the chromosomes has been established, and each chromosome arm has been designated a letter in accordance with the segmental interchange theory. Chromosomes are often irregularly orientated at metaphase I. Chromosomes at anaphase I are generally distributed equally (6-6, 58.75%) although not necessarily balanced. Due to adjacent distribution, 7-5 distribution at anaphase I was frequently observed (24.17%), and due to lagging, 6-1-5 and 5-2-5 distributions were also observed (10.83% and 3.33% respectively). Three types of abnormal distribution, 8-4, 7-1-4 and 6-2-4 were observed very infrequently (2.92% total), and their possible origins are discussed. Irregularities, such as adjacent distribution and lagging, undoubtedly reduce the fertility of the plant because of the resulting unbalanced gametes.
紫叶鸭跖草的变种斑叶紫叶鸭跖草很特别，因为其12条染色体在减数分裂时呈环状排列。染色体的顺序已经确定，并且根据染色体片段互换理论，每条染色体臂都被指定了一个字母。在中期I，染色体常常不规则地定向。后期I的染色体通常平均分配（6 - 6，占58.75%），尽管不一定平衡。由于相邻分布，后期I出现7 - 5分布的情况很常见（占24.17%），并且由于滞后现象，也观察到了6 - 1 - 5和5 - 2 - 5分布（分别占10.83%和3.33%）。三种异常分布类型，8 - 4、7 - 1 - 4和6 - 2 - 4很少被观察到（总共占2.92%），并对其可能的起源进行了讨论。相邻分布和滞后等不规则现象无疑会因为产生不平衡的配子而降低植物的育性。
