Mesodinium rubrum 对蓝绿隐花植物细胞器的保留及其对光生理学和生长的影响。

IF 2.1 4区 生物学 Q3 MICROBIOLOGY
Holly V Moeller, Amelie L'Etoile-Goga, Lucas Vincenzi, Andreas Norlin, Gina S Barbaglia, Gabriel C Runte, Jonatan T Kaare-Rasmussen, Matthew D Johnson
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引用次数: 0

摘要

随着叶绿体偷盗或 "隐生宙 "类群越来越依赖于偷盗来的机器,它们也倾向于对获取这些机器的猎物更加专业化。例如,纤毛虫 Mesodinium rubrum 95% 以上的碳来自光合作用,并专门从隐花植物 Teleaulax 支系中获取质体。不过,在自然界中有时也能观察到红栉水母含有其他隐花植物的质体。在这里,我们报告了红玛瑙藻大量摄取蓝绿隐花植物 Hemiselmis pacifica 的情况,这导致红玛瑙藻细胞器的保留和生长速度的短暂提高。然而,显微镜数据表明,H. pacifica 细胞器并没有经历与 Teleaulax amphioxeia 细胞器相同的重新排列和整合。我们测量了 M. rubrum 的功能反应,量化了生长效益的大小和持续时间,并估算了链格孢子体的光合速率。因此,虽然蓝绿隐花植物在自然环境中可能是一个微不足道的猎物来源,但它们可能会帮助红褐栉水母在没有蛛形纲猎物的情况下存活下来。此外,这些结果也是操纵红铃龟细胞生物学和光生理学的有用工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Retention of blue-green cryptophyte organelles by Mesodinium rubrum and their effects on photophysiology and growth.

As chloroplast-stealing or "kleptoplastidic" lineages become more reliant on stolen machinery, they also tend to become more specialized on the prey from which they acquire this machinery. For example, the ciliate Mesodinium rubrum obtains > 95% of its carbon from photosynthesis, and specializes on plastids from the Teleaulax clade of cryptophytes. However, M. rubrum is sometimes observed in nature containing plastids from other cryptophyte species. Here, we report on substantial ingestion of the blue-green cryptophyte Hemiselmis pacifica by M. rubrum, leading to organelle retention and transient increases in M. rubrum's growth rate. However, microscopy data suggest that H. pacifica organelles do not experience the same rearrangement and integration as Teleaulax amphioxeia's. We measured M. rubrum's functional response, quantified the magnitude and duration of growth benefits, and estimated kleptoplastid photosynthetic rates. Our results suggest that a lack of discrimination between H. pacifica and the preferred prey T. amphioxeia (perhaps due to similarities in cryptophyte size and swimming behavior) may result in H. pacifica ingestion Thus, while blue-green cryptophytes may represent a negligible prey source in natural environments, they may help M. rubrum survive when Teleaulax are unavailable. Furthermore, these results represent a useful tool for manipulating M. rubrum's cell biology and photophysiology.

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来源期刊
CiteScore
4.30
自引率
4.50%
发文量
85
审稿时长
6-12 weeks
期刊介绍: The Journal of Eukaryotic Microbiology publishes original research on protists, including lower algae and fungi. Articles are published covering all aspects of these organisms, including their behavior, biochemistry, cell biology, chemotherapy, development, ecology, evolution, genetics, molecular biology, morphogenetics, parasitology, systematics, and ultrastructure.
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