Photoacclimatory Responses of Zostera marina in the Intertidal and Subtidal Zones.
Photoacclimatory Responses of Zostera marina in the Intertidal and Subtidal Zones.
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DOI：
10.1371/journal.pone.0156214
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Lee KS
中科院分区：
文献类型：
--
作者：
Park SR;Kim S;Kim YK;Kang CK;Lee KS
通过测定两个海湾系统中海草大叶藻叶绿素a荧光参数、光合色素、叶片δ 13 C值和枝条形态，研究了大叶藻在潮间带和潮下带的光适应性反应。潮间带植物有较高的类胡萝卜素浓度比潮下带植物，以避免在白天过度光照条件下的光损伤。潮间带植物的最大相对电子传递速率（rETRmax）和最小饱和辐照度（Ek）高于潮下带植物，而潮下带植物的光合效率（α）和最大量子效率（Fv/Fm）高于潮下带植物。潮间带植物也有显着更大的Stern-Volmer非光化学猝灭（NPQ）比潮下带植物。这些结果表明，潮下带植物的光适应，以更有效地利用有限的光，和潮间带植物表现出光合反应，以尽量减少光损伤在过量的辐照。潮间带植物叶片的δ 13 C值比潮下带植物的δ 13 C值更负，表明潮间带植物在萌发过程中利用大气或溶解态CO2进行光合作用。潮间带植物的有效量子产额（Δ F/Fm ′）在萌发后的下降速度比潮下带植物慢，表明潮间带植物具有更强的耐干燥性。潮间带植物也比潮下带植物更快地从干燥伤害中恢复，这表明光合作用对干燥胁迫的适应。光合可塑性的研究表明，Z.在应对多变的环境条件的码头，最有可能让这个物种出现在潮间带和潮下带。
Photoacclimatory responses of the seagrass Zostera marina in the intertidal and subtidal zones were investigated by measuring chlorophyll a fluorescence parameters, photosynthetic pigments, leaf δ13C values, and shoot morphology in two bay systems. Intertidal plants had higher carotenoid concentrations than subtidal plants to avoid photodamage under excess light conditions during the day. The maximum relative electron transport rate (rETRmax) and minimum saturation irradiance (Ek) of the intertidal plants were higher than those of the subtidal plants, whereas photosynthetic efficiency (α) and maximum quantum yield (Fv/Fm) were higher in subtidal plants. The intertidal plants also had significantly greater Stern–Volmer non-photochemical quenching (NPQ) than that of the subtidal plants. These results suggest that the subtidal plants photoacclimated to use limited light more efficiently, and the intertidal plants exhibited photosynthetic responses to minimize photodamage at excess irradiance. The δ13C values of leaf tissues were more negative in the intertidal plants than those in the subtidal plants, suggesting that the intertidal plants used atmospheric or dissolved CO2 for photosynthesis during emersion. Effective quantum yield (ΔF/Fm´) in the intertidal plants decreased more slowly after emersion than that in the subtidal plants, indicating higher desiccation tolerance of the intertidal plants. The intertidal plants also recovered more rapidly from desiccation damage than the subtidal plants, suggesting photosynthetic adaptation to desiccation stress. The photosynthetic plasticity of Z. marina in response to variable environmental conditions most likely allows this species to occur in the intertidal and subtidal zones.