摘要
采用水培法,研究了外源添加2.5 mmol/L GABA(γ-氨基丁酸)对NaCl胁迫下‘金棚一号’番茄(Lycop-ersicon esculentum Mill.)幼苗活性氧(ROS)代谢及叶绿素荧光参数的影响。结果表明:NaCl胁迫处理导致番茄幼苗ROS积累,同时抗氧化酶(SOD、CAT)活性显著提高,但抗氧化酶活性的提高幅度低于ROS的积累速度,最终导致幼苗光合能力降低;外源GABA处理缓解了NaCl胁迫对幼苗生长的抑制作用,叶片和根系O2.-产生速率、MDA含量显著低于NaCl处理,且SOD、POD、CAT活性以及Fv/Fm、ΦPSII和qP显著提高,但NPQ显著降低。表明外源添加GABA对增强番茄幼苗耐盐性具有重要作用。
The paper investigated the effects of exogenous GABA application to salinized nutrient solution on reactive oxygen species（ROS） metabolism and chlorophyll fluorescence parameters in the seedlings of one tomato cultivar ＇Jin Peng No.1＇ under NaCl stress.The results showed that seedlings grown in nutrient solution salinized with NaCl increased O·-2productive rate,MDA content and antioxidant enzyme（SOD,CAT） activities,but the increasing range of antioxidant enzyme activities was lower than ROS productive rate,which lead to decreased capability of photosystem in tomato seedlings.Exogenous GABA application treatments relieved the harm of NaCl stress to seedlings growth,meanwhile O·-2 productive rate and MDA content in leaves and roots with were significantly lower than NaCl treatment.Compared with NaCl treatment,the activities of SOD,POD,CAT and Fv/Fm,ΦPSII,qP were significantly increased,but NPQ was obviously decreased with GABA application.The findings suggested that exogenous GABA application played an important role for enhancing salt tolerance in tomato seedlings.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2011年第3期37-40,84,共5页
Journal of Hebei Agricultural University
基金
国家自然科学基金资助项目(30900994)
