A Study of Microsporogenesis and Male Gametogenesis in Psammosilene tunicoides (Caryophyllaceae)
A Study of Microsporogenesis and Male Gametogenesis in Psammosilene tunicoides (Caryophyllaceae)
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DOI：
10.5735/085.047.0302
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Yanli Qu;Hong Yu;Xiang Zhou;Yunfeng Xie;Xinqi Chen
中科院分区：
文献类型：
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作者：
Yanli Qu;Hong Yu;Xiang Zhou;Yunfeng Xie;Xinqi Chen
首次报道了金铁锁的小孢子发生和雄配子发生。本种具有石竹科的基本胚胎学特征，如四孢囊花药、纤维状药室内壁、腺质绒毡层、两个绒毡层细胞、花粉母细胞同时胞质分裂和三细胞花粉粒。大部分小孢子为四面体四分体，但有一个居群中观察到菱形四分体。绒毡层的退化在不同居群间存在显著差异。早期或晚期退化都可能导致雄性不育，随后导致生殖失败。两个居群的绒毡层均为二型。我们还包括有关该物种的繁殖系统的数据，并讨论了其对保护目的的影响。
Microsporogenesis and male gametogenesis in Psammosilene tunicoides (Caryophyllaceae) were studied and described for the first time. This species possesses essential embryological features of Caryophyllaceae, such as tetrasporangiate anthers, fibrous endothecium, glandular tapetum, two tapetal cells, simultaneous cytokinesis of pollen mother cells, and three-celled pollen grains. A majority of the microspores were arranged in tetrahedral tetrads, but rhomboidal tetrads were observed in one population. Notable differences in the tapetum degeneration were observed in different populations. Early or late degeneration may both lead to male sterility and subsequently to reproductive failure. The tapetum was dimorphic in two populations. We also included data concerning the breeding system of the species and discussed its implications for conservation purposes.