NaCl胁迫下钙对沙拐枣(Calligonum arborescens)株高及光合特性的影响

doi:10.7522/j.issn.1000-694X.2013.00453

摘要/Abstract

摘要：

研究了在NaCl胁迫下添加钙盐对沙拐枣(Calligonum arborescens)株高、净光合速率、PSII光化学效率、叶绿素含量等的影响,探讨了外源钙盐对植物在NaCl胁迫下的缓解作用.结果表明:随着NaCl浓度的升高,在未添加钙盐的情况下,植株的株高、净光合速率、F_v/F_m、叶绿素含量均呈下降趋势;8 g·L^-1NaCl浓度时,添加CaCl₂后植株的净光合速率、F_v/F_m、叶绿素含量均高于同浓度Ca(NO₃)₂的处理,而16 g·L^-1NaCl浓度时,Ca(NO₃)₂对NaCl胁迫的缓解作用好于CaCl₂;当钙浓度为5 mM时CaCl₂对应的植株高度高于Ca(NO₃)₂,当钙浓度为10、15、20 mM时Ca(NO₃)₂对株高的作用好.相对于生理指标而言,沙拐枣形态指标对NaCl胁迫不敏感;钙对NaCl胁迫的缓解作用与NaCl浓度有关,即存在一个最佳的钠/钙比值,高过或低于这个比值,钙盐的缓解作用就会下降;CaCl₂和Ca(NO₃)₂对NaCl胁迫缓解作用取决于NaCl的浓度,当植物处于中等程度NaCl胁迫时,CaCl₂对生理胁迫的缓解作用比Ca(NO₃)₂好,若植物所受NaCl胁迫程度比较严重,则Ca(NO₃)₂的缓解作用好.

关键词: NaCl胁迫, 钙盐, 沙拐枣(Calligonum arborescens), 株高, 光合速率, PSII光化学效率, 叶绿素含量

Abstract:

NaCl stress can restrain plant growth. Studies have shown that application calcium can alleviate NaCl stress to some extent, so as to promote plant growth. In this paper, we studied the plant height, net photosynthetic, PSII photochemical efficiency, chlorophyll content of Calligonum arborescens under NaCl stress when different calcium sources are added, so as to study the alleviation of NaCl stress by calcium. The results indicate that in the case of not adding calcium salt, plant's height, net photosynthetic, F_v/F_m and chlorophyll content declined with the increasing of sodium chloride concentration; After adding calcium chloride and calcium nitrate, the above indicators all showed a trend of decline after rising first; When NaCl concentration was 8 g·L^-1 the net photosynthetic and F_v/F_m, chlorophyll content of C. arborescens after adding calcium chloride were higher than that of calcium nitrate, however adding calcium nitrate will be better if the NaCl concentration was 16 g·L^-1; When the calcium concentration was 5 mM the plant supplied with CaCl₂ was higher than those supplied with Ca(NO₃)₂, nevertheless, Ca(NO₃)₂ might be a better choice when calcium concentration was 10 mM,15 mM and 20 mM. The above results showed that the morphological indicators relative to the physiological indexes, was not sensitive to NaCl stress. The relief effect of calcium to NaCl stress was related to the concentration of sodium chloride, in other words, there is an optimal ratio of sodium/calcium, higher or lower than which, calcium salt relief effect would fall; The different relief effect between calcium chloride and calcium nitrate depends on the outside of the concentration of NaCl, when plants were under moderate NaCl stress the relief effect of calcium chloride was better than calcium nitrate, however, the calcium nitrate relief well when the plants were under serious NaCl stress.

Key words: NaCl stress, calcium salt, Calligonum arborescens, plant height, net photosynthetic, PSII photochemical efficiency, chlorophyll content

中图分类号:

Q945.78

王静静, 张文鹏, 徐当会. NaCl胁迫下钙对沙拐枣(Calligonum arborescens)株高及光合特性的影响[J]. 中国沙漠, 2015, 35(1): 167-174.

Wang Jingjing, Zhang Wenpeng, Xu Danghui. Influence of Calcium on the Plant Height, Photosynthesis, Fluorescence and Chlorophyll Content of Calligonum arborescens under NaCl Stress[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(1): 167-174.

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