Abstract: The genus Klebsormidium (Klebsormidiales, Streptophyta) has a worldwide distribution in terrestrial habitats. In the present study, we focused on two strains of Klebsormidium flaccidum, the type species of the genus. The isolates used in this study were isolated from soil and freshwater habitats. Photosynthetic activity was evaluated under different controlled gradients of light, temperature and desiccation. The data clearly indicate that both isolates of K. flaccidum exhibit conspicuously different photosynthetic response patterns to photon fluence rate, temperature and desiccation, and thus can be related to their different habitats. Although both strains represent the same species, their physiological response patterns to abiotic gradients as well as their morphology differed to some extent. This indicates high phenotypic plasticity of K. flaccidum, which was maintained even after long-term culture and thus can be explained by the formation of physiologically distinct ecotypes.

中文翻译：

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陆地和淡水生境的绿藻 Klebsormidium flaccidum (Streptophyta) 的光合可塑性

摘要：克雷布氏菌属（Klebsormidiales，Streptophyta）在陆地生境中广泛分布。在本研究中，我们重点研究了该属的模式种 Klebsormidium flaccidum 的两种菌株。本研究中使用的分离物是从土壤和淡水栖息地中分离出来的。在光、温度和干燥的不同受控梯度下评估光合活性。数据清楚地表明，K. flaccidum 的两种分离株对光子通量率、温度和干燥表现出明显不同的光合响应模式，因此可能与其不同的栖息地有关。虽然这两种菌株代表相同的物种，但它们对非生物梯度的生理反应模式以及它们的形态在一定程度上有所不同。