A strategy of Ca2+ alleviating Na+ toxicity in salt-treated Cyclocarya paliurus seedlings: photosynthetic and nutritional responses
A strategy of Ca2+ alleviating Na+ toxicity in salt-treated Cyclocarya paliurus seedlings: photosynthetic and nutritional responses
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Ca2+减轻盐处理青钱柳幼苗Na毒性的策略：光合和营养反应
DOI：
10.1007/s10725-012-9723-1
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发表时间：
2012-06
影响因子：
4.2
通讯作者：
Nichols J Dol
中科院分区：
文献类型：
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作者：
姚瑞玲;方升佐;Nichols J Dol
以青钱柳（Cyclocarya paliurus）幼苗为材料，研究了85 mM NaCl和0、6、12和18 mM Ca（NO3）2处理对青钱柳生长、光合参数以及有机和无机溶质分布和积累的影响。未加Ca（NO3）2处理的植株出现Na+毒害症状，而添加12 mM Ca（NO3）2显著促进了新梢生长，同时叶绿素含量、光合速率、光系统II（PSII）最适量子效率（以Fv/Fm比值和色素含量为代表）以及脯氨酸和可溶性糖含量显著增加。Ca（NO_3）_2的供应增加了K ~+和Ca ~（2+）的浓度，但抑制了Na ~+向地上部的运输。Ca（NO_3）_2处理的植株地上部K ~+/Na ~+比值显著增加。根的X射线显微分析表明，在12 mM Ca（NO3）2浓度下，K+、Ca 2+和Na+主要在根的表皮细胞和皮层细胞中积累，而在中柱薄壁细胞中积累较少，表明外源Ca 2+可能诱导或加强了凯氏带对离子转运的影响。结果表明，Ca（NO3）2通过增强Na+的屏障效应，增加了地上部和叶片中无机和有机溶质的积累，限制了Na+向地上部的运输，从而减轻了盐害，这可能是Ca 2+缓解盐胁迫的一种策略。paliurus幼苗经受盐胁迫。
Cyclocarya paliurus seedlings were subjected to 85 mM NaCl and 0, 6, 12 or 18 mM Ca(NO3)2 treatments to study changes in plant growth, photosynthetic parameters and distribution and/or accumulation of organic and inorganic solutes. Na+ toxicity symptoms were observed in plants non-treated with Ca(NO3)2, while 12 mM Ca(NO3)2 supplementation produced a significant promotion of shoot growth; meanwhile chlorophyll content, photosynthetic rate and optimum quantum yield of photosystem II (PSII), represented by the Fv/Fm ratio and pigments content as well as proline and soluble sugars, significantly increased. Ca(NO3)2 supply increased K+ and Ca2+ concentration, whereas the Na+ transport to the shoot was inhibited. There was a strong increase in the K+/Na+ ratio in shoot of Ca(NO3)2-treated plants. X-Ray microanalysis of roots showed that K+, Ca2+ and Na+ accumulated mainly in the epidermal cells and cortical cells of roots with 12 mM Ca(NO3)2 supply, and low accumulation was observed in stelar parenchyma, indicating exogenous Ca2+ possibly induced or strengthened effects of Casparian bands on ion transport. These results suggest that Ca(NO3)2 supplement increased inorganic and organic solutes accumulation in shoot and leaf, and restricted Na+ transport to the shoot by reinforcing barrier effects for attenuating salt injuries in plants, which could be a strategy of Ca2+ alleviating Na+ toxicity in C. paliurus seedlings subjected to salt stress.
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DOI：
10.1007/978-3-642-79354-7_3
发表时间：
1994
期刊：
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影响因子：
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作者：
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影响因子：
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DOI：
10.1007/978-1-4020-3218-9
发表时间：
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