Photosynthetic and ultrastructural adaptability of Anemone shikokiana leaves to heterogeneous habitats
Photosynthetic and ultrastructural adaptability of Anemone shikokiana leaves to heterogeneous habitats
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DOI：
10.1007/s40415-020-00645-0
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发表时间：
2020-12
影响因子：
1.6
通讯作者：
Pang Yujuan;Liu Lixia;Bian Fuhua
中科院分区：
文献类型：
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作者：
Pang Yujuan;Liu Lixia;Bian Fuhua
海葵Shikokiana(Maina)Maina分布于山顶灌丛和针阔混交林两种异质生境。为了更好地理解YA使用的机制。对不同环境条件下的莽草素叶片的光合作用效率、叶绿素荧光和超微结构进行了研究。结果表明，在相同的光量子通量密度下，山顶灌丛叶片的净光合速率显著高于混交林，而气孔导度、胞间CO2浓度和蒸腾速率显著低于混交林。针阔混交林的光系统II有效量子效率(PSII)、光化学猝灭系数、非光化学猝灭系数和电子传递速率显著低于山顶灌丛植物。然而，PSII的最大量子效率在两种生境之间没有显著差异。透射电子显微镜显示，山顶灌木叶肉细胞的叶绿体和线粒体数量以及叶绿体的淀粉粒数均高于针阔混交林。此外，4、5、6月份呈现逐月上升的趋势。这表明，温度升高增加了它们的数量。这些发现说明了这一点。四栖动物高效地利用环境有限的资源来适应不同的生活环境。这项研究揭示了作为反应基础的机制是OFA。异质生境涉及到光合作用和超微结构的变化，为今后的研究提供了理论基础。
Anemone shikokiana(Makina) Makina is distributed in two heterogeneous habitats, including mountaintop shrubland and conifer and broad-leaf mixed forest. To better understand the mechanisms used byA. shikokianain adapting to these different environments, the photosynthetic efficiency, chlorophyll fluorescence and ultrastructure of the leaves were investigated. The findings revealed that, under the same optical quantum flux density, the net photosynthetic rate in the leaves of mountaintop shrubland was significantly higher than that found in the mixed forest, but the stomatal conductance, intercellular CO2concentrations and transpiration rate were lower. The effective quantum yield of photosystem II (PSII), photochemical quenching coefficient, non-photochemical quenching coefficient and electron transfer rate in the conifer and broad-leaf mixed forest were significantly lower than those values determined for plants in mountaintop shrubland. However, the maximal quantum yield of PSII exhibited no significant difference between the two habitats. Transmission electron micrographs revealed that the numbers of chloroplasts and mitochondria per mesophyll cell and starch grains per chloroplast in the mountaintop shrubs were higher than those found in the conifer and broad-leaf mixed forest samples. Moreover, they showed an increasing trend month by month in April, May and June. It indicated that elevated temperature increased their numbers. These findings illustrate thatA. shikokianaefficiently uses environmentally limited resources to adapt to different living environments. The study reveals that the mechanisms that underlie the response ofA. shikokianato heterogeneous habitats involve photosynthetic and ultrastructural variations, thus providing a theoretical basis for future study.