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

Influence of Calcium on the Plant Height,Photosynthesis,Fluorescence and Chlorophyll Content of Calligonumarborescensunder NaCl Stress

作　　者：王静静[1] 张文鹏[1] 徐当会[1] 

机构地区：[1]兰州大学生命科学学院/草地农业生态系统国家重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2015年第1期167-174,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(31370423;30900171);中国博士后科学基金特别资助项目(20100340)

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、Fv/Fm、叶绿素含量均呈下降趋势;8g·L-1 NaCl浓度时,添加CaCl2后植株的净光合速率、Fv/Fm、叶绿素含量均高于同浓度Ca(NO3)2的处理,而16g·L-1 NaCl浓度时,Ca(NO3)2对NaCl胁迫的缓解作用好于CaCl2;当钙浓度为5mM时CaCl2对应的植株高度高于Ca(NO3)2,当钙浓度为10、15、20mM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。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 arborescensunder 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,Fv/Fmand 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 Fv/Fm,chlorophyll content of C.arborescensafter 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)2might 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.

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 

分 类 号：S793.1[农业科学—林木遗传育种]