荔枝(litchi chinensis Sonn.)花发育过程中雌蕊中钙的分布变化及细胞程序性死亡。

植物生理与分子生物学学报 Pub Date : 2006-12-01
Xiang-Ping Wang, Li-Xun Su, Jin-Wei Su
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引用次数: 0

摘要

采用焦锑酸钾沉淀法研究了荔枝雄花和雌花雌蕊发育过程中钙的分布和细胞超微结构的变化。结果表明,雌花大孢子母细胞时期,钙沉淀主要分布在细胞壁和内被胞间隙靠近珠孔和花柱细胞处,液泡内钙沉淀较少。维管组织中也含有较多的钙沉淀。在雄花微珠附近的内被细胞中,液泡中含有大部分钙沉淀。雄花花柱细胞和维管组织中钙沉淀稀少,很少见到。大孢子母细胞减数分裂后,雌蕊继续生长,雄花雌蕊流产。在雌花中,钙沉淀浓度降低,钙沉淀可能被运送到未来花粉萌发和受精的地方。细胞壁钙沉淀在靠近珠孔的内被细胞中浓度升高。钙沉淀浓度由上花柱细胞向下花柱细胞增加。在雄花中,靠近珠孔的内被膜细胞发生了程序性细胞死亡(PCD):钙从液泡流入细胞核可能触发了PCD过程。核周间隙与细胞质膜腔之间形成连续通道,钙在核膜与质膜之间自由流动。在一定的时间和位置,钙沉淀在一些细胞器如内质网、线粒体和过氧化物酶体中新出现。这种钙在细胞内的重新分配可能触发和调节PCD的过程。在雄花中,没有钙沉淀的花柱细胞很快开始退化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distribution changes of calcium and programmed cell death in the pistil of litchi (Litchi chinensis Sonn.) flower during its development.

Potassium pyroantimonate precipitation method was used for investigating calcium distribution and cell ultrastructure change during development of pistils of litchi male and female flower. The results showed that at the megasporocyte stage of female flowers, calcium precipitates was located mainly at cell wall and intercellular space of inner integument near the micropyle and style cells, and to a lesser extent in vacuoles. Vascular tissues also contained much calcium precipitates. In inner integument cells near the micropyle of male flowers, the vacuole contained most of the calcium precipitates. Calcium precipitates in style cell and vascular tissues of male flowers was sparse and seldom seen. After meiosis of megasporocyte, pistils of female flowers continued to grow and those of male flowers aborted. In female flowers, calcium precipitates concentration became lower and calcium precipitates was probably transported to the places for future pollen bourgeoning and fertilization. Cell wall calcium precipitates concentration increased in the inner integument cells near the micropyle. Calcium precipitates concentration increased from topper style cells to lower ones. In male flowers, inner integument cells near the micropyle underwent the programmed cell death (PCD): flow of calcium from vacuoles into nucleus might had triggered the PCD process. A continuous channel was formed between perinuclear space and cytoplasm membrane lumen, and calcium flowed freely between nuclear membrane and plasma membrane. At certain time and locations, calcium precipitates was newly appeared at some organelles like endoplasimic reticulum, mitochondria and peroxisomes. This calcium redistribution in cells might trigger and regulate the process of PCD. In male flowers, style cells containing no calcium precipitation soon began to degenerate.

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