Photosynthesis Characteristics of Tall Fescue under Snow-Melting Agent, Acid Precipitation and Freeze-Thaw Stress
Photosynthesis Characteristics of Tall Fescue under Snow-Melting Agent, Acid Precipitation and Freeze-Thaw Stress
复制标题
融雪剂、酸降水和冻融胁迫下高羊茅的光合特性
DOI：
10.1134/s1021443720030036
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发表时间：
2020-05-01
影响因子：
1.4
通讯作者：
Zhu, S. N.
中科院分区：
文献类型：
--
作者：
Bao, G. Z.;Tang, W. Y.;Zhu, S. N.
为探讨植物光合作用在酸降水胁迫(A胁迫)、融雪剂胁迫(S胁迫)和冻融胁迫(F胁迫)及其不同组合下的生理响应特征，测定了高羊茅(Festuca arundinacea Schreb.)分别在这三种应力作用下，测量了四种组合应力。评价了不同类型胁迫对光合作用参数的影响，并推测了影响胁迫间互作的主要因素的主要机制。实验结果表明，NAR和WUE在所有胁迫下都显著降低，Ci在所有胁迫下显著增加，Gs在F胁迫下上升，但在A胁迫和S胁迫下下降。光合作用效率随着温度的降低而显着下降，随着温度的升高没有明显的恢复。在低温下，A胁迫和S胁迫组合对光合作用的影响小于S单独胁迫，而F胁迫对光合作用的影响相似。其主要调控机制很可能是光系统II的强烈抑制和酸沉淀产生的抗氧化酶的促进以及氯化钠的存在，从而增强了植物的抗寒性。
To explore the physiological response characteristics of plant photosynthesis under acid precipitation stress (A stress), snow-melting agent stress (S stress), and freeze-thaw stress (F stress) as well as their various combinations, the net assimilation rate (NAR), intercellular CO2 concentration (Ci), stomatal conductance (Gs) and water use efficiency (WUE) of tall fescue (Festuca arundinacea Schreb.) under these three stresses respectively and four kinds of combined stresses were measured. The effects of these different kinds of stresses on the photosynthesis parameters were then evaluated, and the major mechanisms of main factors affecting the interactions between stresses were speculated. The experimental results indicated that both NAR and WUE decreased significantly in response to all stresses and Ci increased dramatically in response to all stresses, while Gs ascended under F stress but descended in response to A stress and S stress. The photosynthetic efficiency significantly decreased as the temperature decreased and did not clearly recover as the temperature increased. Moreover, the combination of A stress and S stress had fewer effects on photosynthesis than did the S stress alone, while the effects resulting from F stress were similar at low temperature. The major controlling mechanism is most likely the strong inhibition of photosystem II and the promotion of antioxidant enzymes resulting from acid precipitation as well as NaCl may strengthen the freezing tolerance of plants.