水杨酸对NaCl胁迫下菊芋幼苗光合作用及离子吸收的影响  

Effects of salicylic acid on photosynthesis and ion absorption Helianthus tuberosus seedlings under NaCl stress

作　　者：王磊[1] 隆小华[1] 孟宪法[1] 刘兆普[1] 晋利[2] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏省海洋生物学重点实验室,南京210095 [2]中国环境管理干部学院环境工程系,河北秦皇岛066004

出　　处：《生态学杂志》2011年第9期1901-1907,共7页Chinese Journal of Ecology

基　　金：国家科技支撑项目(2008BAD95B05、2009BADA3B04-8和2009BADA8B01);公益性行业(农业)科研专项经费项目(200903001-05)资助

摘　　要：为探明水杨酸(SA)对NaCl胁迫下菊芋耐盐生理的调控作用,研究了100μmol·L-1水杨酸对不同浓度NaCl胁迫下菊芋幼苗光合响应特征及离子吸收运输的影响。结果表明:施用水杨酸不仅能够有效缓解NaCl胁迫对菊芋光合作用的抑制,促进NaCl胁迫下菊芋幼苗各种光合色素含量、净光合速率、蒸腾速率、气孔导度和水分利用效率的增加,降低细胞间隙CO2浓度,同时也能明显降低NaCl胁迫下菊芋体内Na+的积累,促进菊芋幼苗对K+和Ca2+的吸收和向上运输,其中在100mmol·L-1NaCl处理下施用水杨酸处理的菊芋叶片中K+和Ca2+含量分别比未施用水杨酸处理增加了12.9%和14.7%,而Na+含量则降低了30.6%。由此证明,一定浓度外源水杨酸的施用有利于促进NaCl胁迫下菊芋幼苗光合功能的改善,以及有效维持菊芋幼苗体内矿质营养元素含量平衡,从而增强菊芋对NaCl胁迫的抗性,提高NaCl胁迫下的生产力。In order to understand the regulative effect of salicylic acid （SA） on the salt tolerance physiology of Helianthus tuberosus under NaCl stress, this paper studied the effects of 100 μmol.L^-1 salicylic acid （SA） on the photosynthesis and ion absorption of 11. tuberosus seedlings under the stress of different concentration NaCl. Applying SA not only effectively alleviated the NaCl stress on the inhibition of H. tuberosus photosynthesis, increased the pigments content, photosynthetic and transpiration rates, stomatal conductance, and water use efficiency, decreased the intercellular CO2 concentration significantly, but also decreased the Na＋ accumulation, and promoted the uptake and upward transport of K^＋ and Ca^2＋. For example, compared with no SA application under 100 mmol·L^-1 NaCl stress, applying 100 μmol · L^-1 of SA decreased the Na^＋ accumulation by 30.6% , and increased the uptake of K^＋ and Ca2＋ by 12. 9% and 14. 7% , respectively, suggesting that applying definite concentration SA could help to improve the photosynthesis of H. tuberosus seedlings under NaCl stress, maintain the balance of mineral nutrients, and enhance the salt resistance and production of H. tuberosus under NaCl stress.

关 键 词：菊芋 NACL胁迫 光合响应 离子吸收 

分 类 号：Q945.78[生物学—植物学]