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Sexual processes and life cycle transitions of the tropical Pacific Alexandrium minutum (Dinophyceae)
Phycological Research ( IF 1.5 ) Pub Date : 2021-05-26 , DOI: 10.1111/pre.12460
Guat Ru Liow 1 , Winnie Lik Sing Lau 1 , Ing Kuo Law 1 , Haifeng Gu 2 , Chui Pin Leaw 1 , Po Teen Lim 1
Affiliation  

Resting cysts of harmful marine dinoflagellates, including Alexandrium species, play an important role in their bloom dynamics, where massive cyst germination is regarded as the natural phenomenon that initiates blooms. The life cycle of Alexandrium minutum from the temperate region has been intensively studied, however, related studies on its tropical counterparts are scarce. In this study, sexual reproduction of a toxigenic A. minutum (tropical Pacific ribotype) was investigated in a laboratory setting. Gamete expression was observed in both compatible cross-mating and self-crossed cultures, but sexual induction was observed only in the compatible cross-mating cultures, confirming the heterothallic nature of the species. Resting cysts were successfully produced in 41 out of 91 pairwise combinations of cross-mating strains. The crossing matrix results showed that the mating system of the tropical Pacific A. minutum was complex, with at least four distinct mating groups observed. The resting cysts had a relatively shorter dormancy period (5–8 days). The rapid encystment-excystment processes and a short cyst dormancy period in this tropical Pacific A. minutum are believed to play crucial roles in governing the bloom and its dynamics in the tropical coastal region.

中文翻译:

热带太平洋亚历山大藻(Dinophyceae)的性过程和生命周期转变

包括亚历山大藻在内的有害海洋甲藻的休眠包囊在它们的绽放动态中发挥着重要作用,其中大量包囊萌发被认为是引发藻华的自然现象。温带地区小亚历山大藻的生命周期已被深入研究,但对其热带同类的相关研究很少。在这项研究中,产毒A. minutum 的有性繁殖(热带太平洋核糖型)在实验室环境中进行了研究。在相容的交叉交配和自交培养物中均观察到配子表达,但仅在相容的交叉交配培养物中观察到性诱导,证实了该物种的异种性质。在交叉交配菌株的 91 个成对组合中的 41 个中成功产生静息包囊。交叉矩阵结果表明,热带太平洋小刺猬交配系统复杂,至少观察到四个不同的交配群。静息囊肿的休眠期相对较短(5-8天)。在这个热带太平洋A. minutum 中的快速包囊 - 包囊过程和短暂的囊肿休眠期 被认为在控制热带沿海地区的水华及其动态方面发挥着至关重要的作用。
更新日期:2021-07-02
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