ELECTRON-MICROSCOPIC STUDY OF OOSPORE MATURATION AND GERMINATION IN AN EMASCULATE ISOLATE OF SAPROLEGNIA-FERAX .2. WALL DIFFERENTIATION
ELECTRON-MICROSCOPIC STUDY OF OOSPORE MATURATION AND GERMINATION IN AN EMASCULATE ISOLATE OF SAPROLEGNIA-FERAX .2. WALL DIFFERENTIATION
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DOI：
10.1139/b80-021
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发表时间：
1980-01-01
期刊：
影响因子：
--
通讯作者：
BEAKES, GW
中科院分区：
文献类型：
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作者：
BEAKES, GW
本文报道了S. ferax和与发芽相关的变化进行了描述。成熟的卵原细胞壁有明显的初生层和次生层，由于次生壁沉积的局部缺失而产生凹坑。成熟卵孢子壁具有0.1 μ m厚的外壁，其与2.0 μ m厚的内壁被薄的（40 nm）电子致密的多层层隔开。在内壁内是由颗粒和膜状材料组成的光学致密（0.5 μ m）内区。在萌发开始时，大部分微纤丝内壁被消化和重吸收，并且在原生质体周围分泌新的萌发壁。当孢子膨胀时，残留的卵孢子或破裂或解体，芽管由萌发壁的生长发育而成。在孢子膨大期，出现了复杂的质膜体复合体，成熟胚壁增厚，并含有丰富的层膜体和栓状的内突。卵孢子壁的形态发生在水霉属进行了比较，在其他卵菌和讨论有关休眠的可能机制。
The fine structure of oogonium and oospore walls of S. ferax and the changes associated with germination are described. Mature oogonium walls have well defined primary and secondary layers with pits arising as the result of the localized absence of secondary wall deposition. The mature oospore wall has a 0.1 .mu.m-thick outer wall separated from a 2.0 .mu.m-thick inner wall by a thin (40 nm) electron-dense, multilaminate layer. Within the inner wall is an optically dense (0.5 .mu.m) inner zone composed of particulate and membranous material. At the onset of germination most of the microfibrillar inner wall is digested and reabsorbed and a new germination wall is secreted around the protoplast. As the spores swell the vestigial oospore remnants either rupture or disintegrate and germ tubes develop by the outgrowth of the germination wall. Elaborate plasmalemmasome complexes appear during the period of spore swelling and the mature germling walls become thickened and contain abundant lomasomes and peglike ingrowths. Oospore wall morphogenesis in Saprolegnia is compared with that in other oomycetes and discussed in relation to the possible mechanisms of dormancy.