HETEROTHALLIC SEXUALITY AND DENSITY DEPENDENT ENCYSTMENT IN THE CHRYSOPHYCEAN ALGA SYNURA PETERSENII KORSH. 1
HETEROTHALLIC SEXUALITY AND DENSITY DEPENDENT ENCYSTMENT IN THE CHRYSOPHYCEAN ALGA SYNURA PETERSENII KORSH. 1
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金藻 SYNURA PETERSENII KORSH 中的异宗性和密度依赖性包囊。
DOI：
10.1111/j.1529-8817.1986.tb04165.x
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发表时间：
1986
影响因子：
2.9
通讯作者：
Joseph I. Flanagin
中科院分区：
文献类型：
--
作者：
C. D. Sandgren;Joseph I. Flanagin
通过对特定培养物中生长的克隆分离株的观察，描述了常见浮游金藻植物 Synura petersenii 的有性繁殖。有性融合是同配和异配的，来自相容克隆的具有正常外观的细胞作为全配子。诱导性行为不需要特殊的培养条件；当与来自相容克隆的足够数量的细胞混合时，活跃生长的细胞群似乎持续接受交配。据记录，一个双极交配组包含所测试的七个克隆中的五个。发现合子静孢子是双核的，成熟时含有 4 个叶绿体。即使是兼容性最高的克隆，接合孢子的生产率也很低，在所用培养条件下，分批培养产量为最终细胞密度的 1-20%。所测试的六个克隆也能够产生频率非常低（0.001-0.01%）的同宗静孢子，但这些包囊的繁殖意义仍然是个谜。性包囊的动态表明，该过程在人口活跃增长时期进行，并且与密度相关。基于胞囊诱导和包囊动力学的特征，得出的结论是，金藻鞭毛虫可能具有与大多数浮游硅藻、甲藻和绿藻完全不同的多年生策略，而大多数浮游硅藻、甲藻和绿藻的休眠胞囊产生需要外源触发，通常与生理应激和负生长期相关。
Sexual reproduction of the common planktonic chrysophyte Synura petersenii is described from observations made on clonal isolates grown in defined culture. Sexual fusion was isogamous and heterothallic, with cells of normal appearance from compatible clones serving as hologametes. No special culture conditions were required to induce sexual behavior; actively growing cell populations appeared to be continually receptive to mating when mixed with a sufficient number of cells from a compatible clone. A single, bipolar mating group was documented containing five of the seven clones tested. Zygotic statospores were found to be binucleate and to contain 4 chloroplasts at maturity. Production rates of zygospores were low for even the most highly compatible clones, with batch culture yields ranging from 1‐20% of final cell density under the culture conditions utilized. Six of the clones tested were also capable of very low frequency (0.001‐0.01%) homothallic statospore production but the reproductive significance of these cysts remains enigmatic. The dynamics of sexual encystment suggest that the process proceeds during periods of active population growth and is density dependent. Based on the characteristics of cyst induction and encystment dynamics, it is concluded that chrysophycean flagellates may have a perennation strategy quite different from that of the majority of planktonic diatoms, dinoflagellates, and green algae for which resting cyst production requires an exogenous trigger usually associated with physiological stress and periods of negative growth.