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首页> 外文期刊>Journal of Experimental Botany >Evidence for phenotypic plasticity in the Antarctic extremophile Chlamydomonas raudensis Ettl. UWO 241
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Evidence for phenotypic plasticity in the Antarctic extremophile Chlamydomonas raudensis Ettl. UWO 241

机译：南极极端嗜衣藻衣原体等表型可塑性的证据。乌沃241

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摘要

Life in extreme environments poses unique challenges to photosynthetic organisms. The ability for an extremophilic green alga and its genetic and mesophilic equivalent to acclimate to changes in their environment was examined to determine the extent of their phenotypic plasticities. The Antarctic extremophile Chlamydomonas raudensis Ettl. UWO 241 (UWO) was isolated from an ice-covered lake in Antarctica, whereas its mesophilic counterpart C. raudensis Ettl. SAG 49.72 (SAG) was isolated from a meadow pool in the Czech Republic. The effects of changes in temperature and salinity on growth, morphology, and photochemistry were examined in the two strains. Differential acclimative responses were observed in UWO which include a wider salinity range for growth, and broader temperature- and salt-induced fluctuations in F-v/F-m, relative to SAG. Furthermore, the redox state of the photosynthetic electron transport chain, measured as 1-q(P), was modulated in the extremophile whereas this was not observed in the mesophile. Interestingly, it is shown for the first time that SAG is similar to UWO in that it is unable to undergo state transitions. The different natural histories of these two strains exert different evolutionary pressures and, consequently, different abilities for acclimation, an important component of phenotypic plasticity. In contrast to SAG, UWO relied on a redox sensing and signalling system under the growth conditions used in this study. It is proposed that growth and adaptation of UWO under a stressful and extreme environment poises this extremophile for better success under changing environmental conditions.
机译：极端环境下的生活给光合生物带来了独特的挑战。检查了极端嗜热藻类及其遗传和嗜温等同物适应环境变化的能力，以确定其表型可塑性的程度。南极极端嗜衣藻衣原体等。 UWO 241（UWO）是从南极一个冰雪覆盖的湖泊中分离出来的，而其中温对应物C. raudensis Ettl。 SAG 49.72（SAG）是从捷克共和国的一个草甸水池中分离出来的。检查了两个菌株中温度和盐度变化对生长，形态和光化学的影响。相对于SAG，在UWO中观察到了不同的适应性响应，其中包括更广的盐度增长范围，以及温度和盐引起的F-v / F-m波动。此外，在极端嗜热菌中调节了光合电子传输链的氧化还原状态（以1-q（P）表示），而在嗜温菌中未观察到。有趣的是，首次显示SAG与UWO类似，因为它无法进行状态转换。这两个菌株的不同自然历史施加不同的进化压力，因此具有不同的适应能力，这是表型可塑性的重要组成部分。与SAG相比，UWO在本研究中使用的生长条件下依赖于氧化还原感测和信号系统。建议在压力和极端环境下UWO的生长和适应使这种极端微生物蓄势待发，可以在不断变化的环境条件下获得更好的成功。

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