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首页> 外文期刊>Marine biology >Physiological and biochemical responses to thermal and salinity stresses in a sterile mutant of Ulva pertusa (Ulvales, Chlorophyta)
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Physiological and biochemical responses to thermal and salinity stresses in a sterile mutant of Ulva pertusa (Ulvales, Chlorophyta)

机译：无菌百日草（Ulvales，Chlorophyta）对热和盐胁迫的生理生化响应

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摘要

Like other organisms in the marine ecosystem, macroalgae are subjected to intense environmental stresses, particularly in the intertidal zone. The green seaweed Ulva inhabits rocky intertidal zones worldwide, suggesting that this alga may be a good model system for studying environmental stress responses in marine plants. Here, we review the physiological and biochemical responses to thermal and salinity stresses in a sterile mutant of Ulva pertusa. In response to high-temperature stress, the amount of photosynthetic pigments, major free amino acids (AA), and total carbon and nitrogen in U. pertusa increase. Changes in chemical components due to high-temperature stress are consistent with morphological changes in thalli subjected to high temperature and suggest that high-temperature stress mainly affects nitrogen metabolism. Isozyme assays show that the alga expresses a glutamate dehydrogenase isozyme in response to high-temperature stress, and that its expression was regulated at the mRNA transcription level. Chemical component changes due to salinity stress indicate a possibility that the low- and high-salinity conditions affect photosynthesis and carbon and nitrogen metabolism, respectively. In particular, it was observed that thalli exposed to hypersaline conditions rapidly accumulate the organic osmolyte proline, suggesting that free proline accumulation is an important tolerance mechanism in this alga for adapting to hypersaline conditions. Finally, we discuss future directions for the molecular analysis of environmental stress in U. pertusa.
机译：像海洋生态系统中的其他生物一样，大型藻类也承受着强烈的环境压力，特别是在潮间带。绿色海藻Ulva栖息在世界各地的岩石潮间带，这表明该藻类可能是研究海洋植物环境胁迫反应的良好模型系统。在这里，我们回顾了百日草无菌突变体中对热和盐胁迫的生理和生化反应。响应高温胁迫，百日草中光合色素，主要游离氨基酸（AA）以及总碳和氮的含量增加。高温胁迫引起的化学成分变化与高温条件下塔利的形态变化相一致，表明高温胁迫主要影响氮的代谢。同工酶分析表明，藻类响应高温胁迫而表达谷氨酸脱氢酶同工酶，并且其表达在mRNA转录水平受到调节。由于盐分胁迫引起的化学成分变化表明，低盐度和高盐度条件分别影响光合作用和碳氮代谢的可能性。特别地，观察到暴露于高盐条件下的拟南芥迅速积累有机渗透电解质脯氨酸，这表明游离脯氨酸积累是该藻类中适应高盐条件的重要耐受机制。最后，我们讨论了百日草环境胁迫分子分析的未来方向。

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