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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Deposition of callose in young ovules of two Taraxacum species varying in the mode of reproduction
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Deposition of callose in young ovules of two Taraxacum species varying in the mode of reproduction

机译：两种蒲公英的幼胚胚中愈伤组织的沉积，其繁殖方式各不相同

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Although callose occurs during megasporogenesis in most flowering plants, the knowledge about its general function and the mechanisms by which the callose layer is formed in particular places is still not sufficient. The results of previous studies suggest a total lack of callose in the ovules of diplosporous plants in which meiosis is omitted or disturbed. This report is the first documentation of callose events in dandelions ovules. We demonstrated the pattern of callose deposition during the formation of megaspores through diplospory of Taraxacum type and during normal meiotic megasporogenesis in apomictic triploid Taraxacum atricapillum and amphimictic diploid Taraxacum linearisquameum. We found the presence of callose in the megasporocyte wall of both diplosporous and sexual dandelions. However, in a diplosporous dandelion, callose predominated at the micropylar pole of megaspore mother cell (MMC) which may be correlated with abnormal asynaptic meiosis and may indicate diplospory of the Taraxacum type. After meiotic division, callose is mainly deposited in the walls between megaspores in tetrads and in diplodyads. In subsequent stages, callose gradually disappears around the chalazal functional megaspore. However, some variations in the pattern of callose deposition within tetrad may reflect variable positioning of the functional megaspore (FM) observed in the ovules of T. linearisquameum.
机译：尽管大多数开花植物在大孢子发生期间都发生call质，但有关其一般功能以及在特定位置形成ose质层的机理的知识仍然不足。先前研究的结果表明，在其中减数分裂被忽略或干扰的二倍体疏松植物的胚珠中完全没有愈伤组织。该报告是蒲公英胚珠中愈伤组织事件的第一个文档。我们证明了通过无性三倍体蒲公英和两性的二倍体线性蒲公英，通过蒲公英类型的双孢子形成大孢子形成和正常减数分裂大孢子发生期间的ose质沉积模式。我们发现在双孢子和有性蒲公英的大孢子细胞壁中都存在of质。然而，在双孢子的蒲公英中，call质在大孢子母细胞（MMC）的毛孔极处占主导，这可能与异常的突触减数分裂有关，并且可能表明蒲公英属的双孢子虫。减数分裂分裂后，愈伤组织主要沉积在四分体和双胞胎中的大孢子之间的壁中。在随后的阶段中，愈伤组织逐渐在功能性大孢子周围消失。但是，四分体内call质沉积模式的某些变化可能反映了在线性等轴线胚珠中观察到的功能性大孢子（FM）的可变位置。

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