THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
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DINOBRYON Divergens Imhof 的静孢子：亚北极湖中的形成和萌发 1
DOI：
10.1111/j.1529-8817.1975.tb02760.x
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发表时间：
1975
影响因子：
2.9
通讯作者：
T. Sawa
中科院分区：
文献类型：
--
作者：
R. Sheath;J. A. Hellebust;T. Sawa
研究了亚北极浅水湖Dinobrion disgenus的种群动态和定孢子发育和萌发的序列。在1973年6月19日至7月3日期间，D.disgens的营养细胞数量急剧增加，随后在6月26日至7月3日期间迅速形成定态孢子。在孢子产生后不久，该物种在浮游植物中急剧下降至不显著水平。统计孢子的形成始于单细胞向洛里卡口的迁移，并通过细胞质的聚集进行。随后在细胞质的较大部分(包括细胞核)周围形成不相等的卵裂，形成硅壁，并在胞核发育后解体胞外细胞质。定孢子在整个发育过程中都是单核的，孢子的形成是无性的。1973年7月20-21日在20和80 cm深度的附生植物样品中观察到定孢子的萌发，次年早些时候在沉积物中观察到定孢子的萌发。在萌发过程中，定孢子孔形成纤维素室，随后孢子内细胞质分裂，大约4个子代原生质体迁移到纤维素室，最终脱离纤维素室。本研究认为，黄金藻的无性和内源产生的定孢子应被认为是与那些同性和自交形成的不同的实体，但不一定是内源的。由有性过程产生的后一种定态孢子称为合孢子。
The population dynamics and the sequences of statospore development and germination of Dinobryon divergens from a shallow subarctic lake were examined. D. divergens showed a sharp increase in the vegetative cell population between June 19 and July 3, 1973, followed by a rapid formation of statospores from June 26 to July 3. Shortly after spore production, this species decreased sharply to an insignificant level in the phytoplankton. Statospore formation to as initialed by migration of the monad cell to the lorica mouth and proceeded by rounding up of the cytoplasm. There was then an unequal cleavage, silica wall formation around the larger portion of the cytoplasm including the nucleus and disintegration of the extracystic cytoplasm after development of the plug. The statospore was uninucleate throughout its development, and it was concluded that spore formation occurred asexually. Germination of statospores was observed in periphyton samples at depths of 20 and 80 cm on July 20–21, 1973 and in the sediments earlier the following year. During germination a cellulose chamber was produced from the pore of the statospore, followed, by cleavage of the cytoplasm within the spore and migration of approximately 4 daughter protoplasts into the cellulose chamber from which they eventually escaped. The present study proposes that chrysophycean statospores arising asexually and endogenously should be recognized as separate entities from those formed isogamously and autogamously but not necessarily endogenously. The latter statospores resulting from the sexual process have been given the term zygospore.