摘要
研究了在水培条件下,外源施加0.3,0.6,0.9,1.2 mmol/L水杨酸(SA)对150 mmol/L NaCl胁迫下杭白菊幼苗生长及生理特性的影响。结果表明:施加不同浓度的水杨酸均能有效缓解盐胁迫对杭白菊幼苗生长的抑制,使得NaCl胁迫下杭白菊幼苗株高、鲜重和干重均相应增加;提高了NaCl胁迫下杭白菊超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)等抗氧化酶活性和脯氨酸含量,抑制了盐胁迫诱导的活性氧(ROS)和丙二醛(MDA)含量的上升,缓解了氧化胁迫损伤;提高了叶片中叶绿素含量和根系活力,抑制了对Na^+和Cl^-的吸收,从而促进其光合生产能力和对K、Ca、Mg等矿质元素的吸收能力,减轻了盐胁迫的毒害。说明外源施加水杨酸在提高杭白菊幼苗抗盐胁迫的生理过程中起重要作用。试验各处理以0.9 mmol/L水杨酸处理缓解杭白菊幼苗盐胁迫的效果最佳。
The effects of salicylic acid(SA)with concentrations of 0.3,0.6,0.9 and 1.2 mmol/L on the growth and physiological properties of chrysanthemum seedlings under 150 mmol/L NaCl stress were studied with the methods of spraying exogenous SA on leaves of chrysanthemum.The results showed that SA alleviated the inhibitory effect of salt on the growth of chrysanthemum seedlings,which increased the plant height,fresh weight,dry weight,root activity and chlorophyll content of chrysanthemum seedlings under NaCl stress.The application of SA enhanced activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)and ascorbate peroxidase(APX)activities,and increased the content of proline and soluble protein,but decreased the content of malondialdehyde(MDA)and reactive oxygen species(ROS),and reduced Na^+,Cl^-accumulation and K^+,Ca^2+,Mg^2+loss,indicating that extraneous SA can alleviate salinity injury by improving photosynthetic efficiency and ROS scavenging ability,and keeping ion balance and osmosis balance of chrysanthemum seedlings under salt stress.These results showed that exogenous SA played an important role in improving salt tolerance of chrysanthemum seedlings.Treatment of 0.9 mmol/L SA was the most prominent in the effect of relieving salt stress.
作者
赵宝泉
邢锦城
王静
朱小梅
刘冲
洪立洲
ZHAO Baoquan;XING Jincheng;WANG Jing;ZHU Xiaomei;LIU Chong;HONG Lizhou(Jiangsu Coastal Shoalbased Agricultural Engineering Research Center,Institute of Agricultural Sciences in Coastal Area of Jiangsu Province,Yancheng 224002,China;China Rural Technology Development Center,Beijing 100045,China)
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2020年第4期370-379,共10页
Journal of Jilin Agricultural University
基金
江苏省农业科技自主创新基金项目[CX(17)1004]
国家自然科学基金项目(31800525)
农业部沿海盐碱地科学观测实验站开放课题(YHS201608)
江苏省自然科学基金项目(BK20151301)
江苏省盐土生物资源研究重点实验室开放课题(JKLBS2015010)
江苏省海洋滩涂生物化学与生物技术重点建设实验室开放项目(K2016-01)
苏北科技专项(SZ-YC2018059,SZ-YC2018060)。
关键词
杭白菊
盐胁迫
水杨酸
抗氧化酶
离子代谢
Chrysanthemum morifolium Ramat
salt stress
salicylic acid
antioxidant enzyme
ion metabolism
