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首页> 外文期刊>Cell biology international. >A differential phenotypic expression of a divergent spindle mutation in interspecific Brachiaria hybrids.
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A differential phenotypic expression of a divergent spindle mutation in interspecific Brachiaria hybrids.

机译：种间Brachiaria杂种中不同纺锤体突变的差异表型表达。

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摘要

Several mutations are known to alter the normal progression of meiosis and can be correlated with defects in microtubule distribution. The dv mutation affects the spindle organization and chromosomes do not converge into focused poles. Two Brachiaria hybrids presented the phenotypic expressions of dv mutation but exhibited many more details in the second division. Bivalents were distantly positioned and spread over a large metaphase plate and failed to converge into focused poles. Depending on the distance of chromosomes at the poles, telophase I nuclei were elongated or the chromosomes were grouped into various micronuclei of different sizes in each cell. The first cytokinesis occurred. However, when there were micronuclei, a second cytokinesis immediately took place dividing the prophase II meiocytes into three or four cells. In each meiocyte, meiosis progressed to the second division. Slightly elongated nuclei or micronuclei were recorded in telophase II. After a third cytokinesis, hexads or octads were formed. Pollen grains of different sizes were generated. One of these hybrids presented a higher frequency of abnormal cells than when previously analyzed. The fate of these hybrids as genitors or as candidates for cultivars in the Brachiaria breeding program is discussed.
机译：已知几种突变会改变减数分裂的正常进程，并可能与微管分布缺陷有关。 dv突变会影响纺锤体的组织，并且染色体不会汇聚成聚焦极。两个腕带杂种表现出dv突变的表型表达，但在第二部分显示更多细节。二价体在远处定位并散布在较大的中期板上，未能汇聚成聚焦极。根据极点处染色体的距离，延长了末期I核或将染色体分为每个细胞中大小不同的各种微核。发生第一次胞质分裂。但是，当存在微核时，立即发生第二次胞质分裂，将前期II肌细胞分为三个或四个细胞。在每个减数分裂细胞中，减数分裂进行到第二分裂。在末期II中记录了稍拉长的核或微核。第三次胞质分裂后，形成了六联体或八联体。产生了不同尺寸的花粉粒。这些杂种之一表现出比先前分析更高的异常细胞频率。讨论了这些杂种作为腕足动物育种计划的繁殖者或候选品种的命运。

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