THE ULTRASTRUCTURE OF DERBESIA TENUISSIMA (DE NOTARIS) CROUAN. I. ORGANIZATION OF THE GAMETOPHYTE PROTOPLAST, GAMETANGIUM, AND GAMETANGIAL PORE 1, 2, 3
THE ULTRASTRUCTURE OF DERBESIA TENUISSIMA (DE NOTARIS) CROUAN. I. ORGANIZATION OF THE GAMETOPHYTE PROTOPLAST, GAMETANGIUM, AND GAMETANGIAL PORE 1, 2, 3
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DERBESIA TENUISSIMA (DE NOTARIS) CROUAN 的超微结构。
DOI：
10.1111/j.1529-8817.1974.tb02723.x
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发表时间：
1974
影响因子：
2.9
通讯作者：
J. Z. Page
中科院分区：
文献类型：
--
作者：
A. Wheeler;J. Z. Page
描述了细小德贝氏菌营养配子体和生殖配子体的超微结构。配子囊的发育和配子的释放过程如下：(1)配子囊形成的初始阶段，配子释放前24小时，细胞核、叶绿体和其他细胞器的积累和增殖。(2)随后用配子膜将配子囊与植物的其余部分分离；细胞器在释放前12小时开始分离成配子，这一过程在释放前2.5小时完成。(3)酶促孔壁溶解发生在正常开灯前2.5~12小时之间。(4)释放机制似乎是光诱导的瞬时压力增加，破坏了壁上弱化的孔洞区域，并导致配子被强行排出。(5)释放后，气孔被细胞器碎片和配子角质膜封闭。额外的壁层被认为是由迁移到该地区的营养原生质在堵塞的毛孔内部铺设的。
The fine structure of vegetative and reproductive gametophytes of Derbesia tenuissima is described. Development of the gametangium and release of the gametes progress as follows: (1) In initial stages of gametangium formation, prior to 24 hr before gamete release, there is an accumulation and proliferation of nuclei, chloroplasts, and other organelles. (2) This is followed by separation of the gametangium from the rest of the plant by a gametangial membrane; segregation of organelles into gametes has begun by 12 hr before release and the process is completed by 2.5 hr before release. (3) Enzymatic wall dissolution of the pore area occurs between 2.5 and, 12 hr before normal lights‐on time. (4) The release mechanism appears to be an instantaneous light‐induced increase in lurgor pressure rupturing the weakened pore area, of the wall and causing a forcible expulsion of the gametes. (5) Following release, the pore is sealed by organellar debris and the gametangial membrane. Additional wall layers are presumed to be laid down internal to the plugged pore by the vegetative protoplasm which migrates into the area.