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首页> 外文期刊>Journal of genetics >Male and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.
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Male and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.

机译：雄性和雌性减数病evince在Chiasma形成中的差异模式 - 一种观赏植物，Delphinium Ajacis L.

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Chromosomal behaviour during megasporogenesis and microsporogenesis has been studied in ornamental Delphinium ajacis L. Meiosis in female sex cell initiates later than male. The floral buds which carry egg mother cell (EMC) at diplotene stage has pollen mother cells (PMCs) at tetrad stage of meiosis suggesting protandry. Although the 16 chromosomes formed regular eight bivalents in both the sex cells, they differed in overall chiasma frequency which was 32.95% higher in EMCs and found to be 18.52 +/- 2.12 per cell. In PMCs, the average chiasma frequency recorded was 13.93 +/- 1.40 per cell. Interestingly, this variation in chiasma frequency was largely confined to the two large bivalents which shared 42.61% chiasma per EMC. The use of Q-Q plot, Box plot and Whisker plot showed departure in the chiasma frequency distributions in EMCs and PMCs from the normal distribution pattern. The difference in chiasma frequency in the two sex cells was significant at all levels as indicated by the low P values of 3.094 x 10(-11) obtained from nonparametric test, i.e. Wilcoxon rank-sum test. It is suggested that the two different mechanisms of recombination are operational in the two sex cells, and the sex differences of chiasma frequency could have arisen due to differential epigenetic modifications of the chromatin which pattern the double-strand breaks, and the position and frequency of crossing over visible as chiasmata.
机译：对观赏飞燕草大孢子发生和小孢子发生过程中的染色体行为进行了研究。在减数分裂的四分体阶段，携带卵母细胞（EMC）的花芽有花粉母细胞（PMCs），这表明花粉母细胞是前雄蕊。尽管这16条染色体在两个性细胞中形成了规则的八个二价体，但它们在整体交叉频率上存在差异，在EMC中的交叉频率高出32.95%，并且发现每个细胞的交叉频率为18.52+/-2.12。在PMCs中，记录的平均交叉频率为13.93+/-1.40个细胞。有趣的是，这种交叉频率的变化主要局限于两个大的二价体，它们在每个EMC中共享42.61%的交叉。Q-Q图、箱图和须图的使用表明，EMC和PMC中的交叉频率分布偏离正态分布模式。从非参数检验（即Wilcoxon秩和检验）得到的低P值3.094 x 10（-11）表明，两个性细胞的交叉频率在所有水平上都存在显著差异。有人认为，这两种不同的重组机制在两个性细胞中是可操作的，交叉频率的性别差异可能是由于染色质的不同表观遗传修饰引起的，染色质是双链断裂的模式，交叉的位置和频率可视为交叉。

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