Effects of salinity and clonal integration on the amphibious plant Paspalum paspaloides: growth, photosynthesis and tissue ion regulation
Effects of salinity and clonal integration on the amphibious plant Paspalum paspaloides: growth, photosynthesis and tissue ion regulation
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盐度和克隆整合对两栖植物雀稗的影响：生长、光合作用和组织离子调节
DOI：
10.1093/jpe/rtx061
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Yu Fei Hai
中科院分区：
文献类型：
--
作者：
Xing Ya Ping;Wei Guan Wen;Luo Fang Li;Li Chao Yang;Dong Bi Cheng;Ji Jie Shan;Yu Fei Hai
目的克隆整合可以提高克隆植物在环境胁迫下的性能，许多湿地的克隆植物通常面临伴随盐度的洪水胁迫。然而，很少有研究测试克隆整合在两栖植物从陆地扩展到水生盐水生境中的作用。方法将雀稗克隆片段的基部（较老）分株种植在土壤中以模拟陆地生境，而将其顶端（较年轻）分株放置在含有0、50、150和250 mmol的盐水表面。 l−1 氯化钠 模仿水生栖息地的不同盐度水平。连接顶端和基部分株的匍匐茎要么完整（连接）以允许克隆整合，要么被切断（断开）以阻止整合。重要发现增加盐度水平显着降低了P的顶端分株的生长。雀稗，并且在处理 60 天后，这种对叶子生长的影响没有匍匐茎连接比有匍匐茎连接要高得多。同时，高盐处理下连接的顶端分株与断开的顶端分株的叶质量和总质量比高于低盐处理。相应地，在高盐处理中，有匍匐茎连接的顶端分株的Fv/Fm和F/Fm'高于无匍匐茎连接的分株。结果表明，克隆整合有利于顶端分株从陆地土壤传播到盐水中，并且积极作用随着盐度的增加而增加。然而，克隆整合并没有显着影响整个片段的生长。由于克隆整合，Na + 可以从顶端转移到基部分株，以减轻顶端分株的离子毒性。我们的结果表明克隆整合有利于 P 的扩展。通过保持光合能力和改变生物量分配模式，雀稗从陆地到水生盐生栖息地。
AimsClonal integration can increase performance of clonal plants suffering from environmental stress, and clonal plants in many wetlands commonly face stress of flooding accompanied by salinity. However, few studies have tested roles of clonal integration in amphibious plants expanding from terrestrial to aquatic saline habitats.MethodsBasal (older) ramets of clonal fragments ofPaspalum paspaloideswere grown in soil to simulate terrestrial habitats, whereas their apical (younger) ramets were placed at the surface of saline water containing 0, 50, 150 and 250 mmol l−1NaCl to mimic different salinity levels in aquatic habitats. Stolons connecting the apical and basal ramets were either intact (connected) to allow clonal integration or severed (disconnected) to prevent integration.Important FindingsIncreasing salinity level significantly decreased the growth of the apical ramets ofP. paspaloides, and such effects on the leaf growth were much higher without than with stolon connection after 60-day treatment. Meanwhile, leaf and total mass ratios of the connected to the disconnected apical ramets were higher at high than at low saline treatments. Correspondingly, Fv/Fm and F/Fm′ of the apical ramets were higher with than without stolon connection in highly saline treatments. The results suggest that clonal integration can benefit the spread of apical ramets from terrestrial soil into saline water, and that the positive effects increase with increasing salinity. However, clonal integration did not significantly affect the growth of the whole fragments. Due to clonal integration, Na+could be translocated from the apical to the basal ramets to alleviate ion toxicity in apical ramets. Our results suggest that clonal integration benefits the expansion ofP. paspaloidesfrom terrestrial to aquatic saline habitats via maintained photosynthetic capacities and changed biomass allocation pattern.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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