The effect of calcium on the antioxidant systems in the halophyte Cakile maritima under salt stress
The effect of calcium on the antioxidant systems in the halophyte Cakile maritima under salt stress
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DOI：
10.1007/s11738-009-0420-2
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发表时间：
2010-05-01
影响因子：
2.6
通讯作者：
Abdelly, Chedly
中科院分区：
文献类型：
--
作者：
Ben Amor, Nader;Megdiche, Wided;Abdelly, Chedly
研究了盐生植物Cakile maritima在0、100、200和400 mM盐胁迫下，不同浓度的钙离子(0、3.5和20 mM)对其抗氧化系统的影响。中等钙(3.5 mM)和盐分(100 MM)处理的植株生长量最大，在营养基质中添加20 mM的钙对中等盐分处理下的生长没有显著的抑制作用。缺钙与高盐浓度相关，导致生物质产量的强烈下降。Maritima对中等盐度和钙的耐受性与指示氧化胁迫的参数(丙二醛、电解质渗漏和过氧化氢浓度)的最低值有关。伴随着较高的过氧化物酶、超氧化物歧化酶、抗坏血酸过氧化物酶、单脱氢抗坏血酸还原酶、脱氢抗坏血酸还原酶和谷胱甘肽还原酶的活性。相比之下，在没有钙的情况下，这些酶在所有盐处理下显示出最低的活性。总体上可以看出，适量的钙浓度可以提高藻类的耐盐性，但缺钙对海藻的耐盐性影响较大。
The purpose of the current investigation was to study the effect of Ca2+ (0, 3.5 and 20 mM concentrations) on the antioxidant systems in the halophyte Cakile maritima under NaCl stress (0, 100, 200 and 400 mM NaCl). Plants treated with both moderate calcium (3.5 mM) and salt levels (100 mM) showed the maximum growth, and the addition of 20 mM calcium to the nutrient media did not significantly reduce the growth under the moderate salt treatment. The absence of calcium associated with high salt concentration induced a strong reduction of biomass production. The tolerance of C. maritima at moderate salinity and calcium was related with the lowest values of the parameters indicative of oxidative stress (malondialdehyde, electrolyte leakage and hydrogen peroxide concentration). This was accompanied with a higher peroxidase, superoxide dismutase, ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase and glutathione reductase activities. In contrast, in the absence of calcium, those enzymes showed the lowest activities under all salt treatments. As a whole, it can be noticed that salt tolerance was improved by moderate calcium concentration; however, the absence of calcium has a drastic effect on C. maritima.