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首页> 外文期刊>Cell biology international. >Cytoskeletal mechanisms in positioning of the second-division spindles and meiotic restitution in tobacco (Nicotiana tabacum L.) microsporogenesis
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Cytoskeletal mechanisms in positioning of the second-division spindles and meiotic restitution in tobacco (Nicotiana tabacum L.) microsporogenesis

机译：在烟草（Nicotiana Tabacum L.）微孢子发生中的第二分区主轴和减数分裂原状定位的细胞骨架机制

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Microsporogenesis patterns of the polyploid (2n = 4x = 96) and diploid (2n = 2x = 48) Nicotiana tabacum L. (cv. Havana Petit line SR1) plants have been analyzed and compared. Four types of abnormal positions of the second-division spindlestripolar, parallel, proximal, and fused-have been observed. Of these abnormalities, only tripolar (2.4%) and parallel (1.4%) spindles are observable in diploid plants. As for polyploids, the increased ploidy is accompanied by an increase in the incidence of tripolar (22.8%) and parallel (8.1%) spindle orientations and emergence of two remaining abnormalities (proximal and fused spindles, 3.3%). As has been shown, the spindle position abnormalities in diploid plants have no effect on the meiotic products, whereas both dyads and triads are detectable among the tetrads in polyploid plants. Analysis of cytoskeletal remodeling has allowed for the insight into the role of interzonal radial microtubule system in spindle positioning during the second division. The reason underlying the change in spindle positioning is disturbed polymerization-depolymerization processes and interdigitation of microtubule plus ends within the interzonal cytoskeleton system in late telophase I-interkinesis and prophase II. As has been demonstrated, fused second-division spindles are formed as a result of fused cytoskeletal structures in prophase-prometaphase II in the case when the nuclei are drawn abnormally close to one another.
机译：多倍体（2N = 4x = 96）和二倍体（2N = 2x = 48）尼古利亚纳Tabacum L.（CV.Avana Petit Line SR1）植物的微微孢血孢血孢血细胞生成图案。已经观察到第二分阶段Spindlestripolar，平行，近端和融合的四种类型的异常位置。在这些异常的情况下，在二倍体植物中只能观察到大疣（2.4％）和平行（1.4％）主轴。对于多倍体，增加的倍性倍增性伴随着黎罗尔（22.8％）和平行的发病率（8.1％）主轴取向和两种剩余异常的出现（近端和熔合主轴，3.3％）。如图所示，二倍体植物中的主轴位置异常对减数分裂产物没有影响，而二元和三合会在多倍体植物中的四肢中可检测到。分析细胞骨架重塑已经允许深入了解第二划分期间主轴定位中的界带径向微管系统的作用。主轴定位变化的原因是受干扰的聚合 - 解聚过程和微管骨末端的末端在后期簇绒I-interkinesis和PROPHase II中的界面细胞骨架系统内的末端。如已经证明的，当核被彼此异常接近时，在预防序列 - Prometaphase II中的熔融细胞骨骼结构的结果形成熔融的第二分割主轴。

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