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首页> 外文期刊>Journal of genetics >Desynapsis and precocious cytokinesis in Brachiaria humidicola (Poaceae) compromise meiotic division
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Desynapsis and precocious cytokinesis in Brachiaria humidicola (Poaceae) compromise meiotic division

机译：臂锈菌（禾本科）的去突触和早熟胞质分裂影响减数分裂分裂

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摘要

The forage grass species Brachiaria humidicola is native to African savannas. Owing to its good adaptation to poorly drained and infertile acid soils, it has achieved wide utilization for pastures in Brazilian farms. Among the 55 accessions of B. humidicola analysed from the Embrapa Beef Cattle collection, one (H022), presented desynapsis and an abnormal pattern of cytokinesis in the first meiotic division. Among 28 inflorescences analysed in this accession, 12 were affected by the anomaly. In affected meiocytes, the first cytokinesis occurred in metaphase I and was generally perpendicular to a wide-metaphase plate, dividing the genome into two parts with an equal or unequal number of chromosomes. The normal cytokinesis after telophase I did not occur, and the meiocytes entered metaphase II, progressing to the end of meiosis with the occurrence of the second cytokinesis. As the first cytokinesis occurred precociously, whereas the second was normal, tetrads were formed but with unbalanced chromosome numbers in microspores. Abnormal cytokinesis occurred only in those meiocytes that underwent desynapsis after diakinesis. The implications of this abnormality in the Brachiaria breeding programme are discussed.
机译：饲草物种Brachiaria humidicola原产于非洲大草原。由于它对排水不良和贫瘠的酸性土壤具有良好的适应性，因此已广泛用于巴西农场的牧场。从Embrapa牛肉牛收集物中分析的55份湿地芽孢杆菌种中，一种（H022）在第一次减数分裂中表现出突触和胞质分裂的异常模式。在该种中分析的28个花序中，有12个受到异常的影响。在受影响的单核细胞中，第一次胞质分裂发生在中期I，通常垂直于宽中期板，将基因组分为两个部分，具有相等或不相等的染色体数。末期I后未发生正常的胞质分裂，并且肌细胞进入了中期II，随着第二次胞质分裂的发生而进展至减数分裂结束。由于第一次胞质分裂发生较早，而第二次是正常的，因此形成了四分体，但在小孢子中染色体数目不平衡。细胞动力学异常仅发生在运动异常后经历去突触的那些肌细胞中。讨论了这种异常在臂臂繁殖计划中的含义。

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