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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Study of male sterility in Taiwania cryptomerioides Hayata (Taxodiaceae)
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Study of male sterility in Taiwania cryptomerioides Hayata (Taxodiaceae)

机译：台湾隐花Hay（Taxodiaceae）雄性不育的研究

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摘要

A study of male sterility over a period of three consecutive years on a conifer species endemic to Taiwan, Taiwania cryptomerioides Hayata (Taxodiaceae), was done for this article. With the aids of fluorescence and electron microscopic observations, the ontogenic processes in the fertile and sterile microsporangia are compared, using samples collected from Chitou Experimental Forest and Yeou-Shoei-Keng Clonal Orchard of the National Taiwan University, Nantou, Taiwan. The development of male strobili occurred from August to the end of March. Microsporogenesis starts with the formation of the archesporium and ends with the maturation of 2-celled pollen grains within the dehiscing microsporangium. Before meiosis, there was no significant difference in ultrastructure between the fertile and sterile microsporangia. Asynchronous pollen development with various tetrad forms may occur in the same microsporangium of either fertile or sterile strobili. However, a callose wall was observable in the fertile dyad and tetrad, but not in the sterile one. After dissolution of the callose wall, the fertile microspores were released into the locule, while some sterile microspores still retained as tetrads or dyads with intertwining of exine walls in the proximal faces. As a result, there was no well developed lamellated endexine and no granulate ectexine or intine in the sterile microspores. Eventually, the intracellular structures in sterile microspores were dramatically collapsed before anthesis. The present study shows that the abortion in pollen development is possibly attributed to the absence of the callose wall. The importance of this structure to the male sterility of T. cryptomerioides is discussed.
机译：本文针对台湾特有的针叶树种台湾阔叶树（Taxodiaceae）连续三年进行了雄性不育研究。借助荧光和电子显微镜观察，使用从台湾南投的Chitou实验林和国立台湾大学Yeou-Shoei-Keng克隆果园收集的样品，比较了可育和无菌小孢子囊的发生过程。从8月到3月底发生了可塑性。小孢子发生始于原型孢子囊的形成，并以开裂的小孢子囊内的2细胞花粉粒的成熟结束。减数分裂前，可育和无菌小孢子囊在超微结构上没有显着差异。具有多种四联体形式的异步花粉发育可能发生在可育或无菌可塑性的同一微孢子囊中。但是，在可育的二倍体和四倍体中可观察到ose壁，但在无菌壁中则不可见。 ose壁溶解后，可育的小孢子释放到小室中，而一些无菌小孢子仍保留为四分体或二联体，外壁壁缠绕在近端。结果，在无菌小孢子中没有发育良好的层状内啡肽，也没有颗粒状的艾塞西汀或肌醇。最终，无菌小孢子中的细胞内结构在花期前急剧倒塌。本研究表明花粉发育中的流产可能归因于the壁的缺乏。讨论了这种结构对隐孢子虫雄性不育的重要性。

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