Physiological adaptations of the submerged macrophyte Vallisneria spinulosa in response to water level fluctuations
Physiological adaptations of the submerged macrophyte Vallisneria spinulosa in response to water level fluctuations
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DOI：
10.1007/s10452-020-09808-3
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发表时间：
2020-11
期刊：
影响因子：
1.8
通讯作者：
M. Ding;Ruixue Zhou;Tenlong Chen;Liang He;E. Jeppesen;Lei Li
中科院分区：
文献类型：
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作者：
M. Ding;Ruixue Zhou;Tenlong Chen;Liang He;E. Jeppesen;Lei Li
由于气候变化，预计未来浅水湖泊的水位波动(WLFS)将增加。这种波动显著影响沉水植物的生长和繁殖，但WLF在植物生理机制中的作用还远不清楚。我们的目的是通过测试(1)叶绿体色素、(2)抗氧化酶的反应、(3)碳(C)、氮(N)和磷(P)的浓度以及(4)植物化学计量比(C/N、C/P和N/P)的变化来研究WLF对沉水植物Vallisneria Spulosa的影响。在室外中胚层中，植物受到两个幅度和两个频率的WLF，并以稳定的水位为对照。与对照相比，波动处理表现出较高的叶绿素a和b浓度。增加幅度和频率可促进过氧化物酶(POD)活性。棘果，表明对氧化应激的反应，但超氧化物歧化酶(SOD)保持不变。此外，与对照相比，WLF普遍提高了植物叶片的磷含量，并相反地影响了叶片的C/P和N/P比值。水分胁迫后，植株体内的C、N含量相对稳定，但随着水分胁迫幅度的增加，植株对P的吸收(即叶片P含量)增加。促进了刺菜的生长。我们的结果表明，V。洪泛区刺梨的成功生长可能与其根据WLF的变化而采取的生理适应策略有关。为了维持浅水湖系统的健康和可持续性，应进一步研究多种水文因素对浅水湖系统的综合影响。
Due to climate change, water level fluctuations (WLFs) in shallow lakes are expected to increase in the future. Such fluctuations significantly affect the growth and reproduction of submerged macrophytes, but the role of WLF on plant physiological mechanisms is far from clear. Our aims are to examine the effects of WLF on the submerged macrophyteVallisneria spinulosaby testing changes in (1) chloroplast pigments, (2) the response of antioxidant enzymes, (3) the concentrations of carbon (C), nitrogen (N) and phosphorus (P) and (4) plant stoichiometry (ratios of C/N, C/P and N/P). In outdoor mesocosms, plants were subjected to two amplitudes and two frequencies of WLF, with stable water level as a control. Generally, compared with the control, the fluctuation treatments showed higher chlorophyll a and b concentrations. Increased amplitude and frequency promoted peroxidase (POD) activity inV. spinulosa, indicating a response to oxidative stress, but superoxide dismutase (SOD) remained unchanged. Moreover, compared with the control, WLF generally increased leaf P and reversely affected the leaf C/P and N/P ratios of plants. The C and N contents in the plants were relatively stable following WLF, but with increasing WLF amplitude, P absorption (i.e. leaf P content) byV. spinulosawas promoted. Our results indicate that the ability ofV. spinulosato successfully grow in floodplains may be related to the physiological adaptive strategies according to the alterations in WLF. Combined effects of several hydrological factors on shallow lake should be further studied in order to maintain the health and sustainability of shallow lake systems.