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不同水平Cl^-对西瓜幼苗膜脂过氧化及活性氧清除系统的影响 被引量:1
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作者 张兆辉 汪李平 陈春宏 《上海农业学报》 CSCD 北大核心 2011年第1期73-76,共4页
以西瓜多代自交系17C04与JX-2为供试材料,研究了不同水平Cl^-对西瓜幼苗膜脂过氧化、保护酶活性及抗氧化剂的影响。结果表明:在Cl^-胁迫条件下,2个品系幼苗叶片中MDA含量和相对电导率均显著高于对照。随着Cl^-浓度升高,2个品系的SOD、PO... 以西瓜多代自交系17C04与JX-2为供试材料,研究了不同水平Cl^-对西瓜幼苗膜脂过氧化、保护酶活性及抗氧化剂的影响。结果表明:在Cl^-胁迫条件下,2个品系幼苗叶片中MDA含量和相对电导率均显著高于对照。随着Cl^-浓度升高,2个品系的SOD、POD活性逐渐升高,均显著高于对照;CAT活性则逐渐降低;2个品系的GSH含量先升高后降低,均显著高于对照;JX-2的AsA含量逐渐增加,而17C04的AsA含量先升高后降低。在相同Cl^-条件下,JX-2幼苗叶片的SOD活性、AsA含量均显著高于17C04;相对电导率则显著低于17C04。 展开更多
关键词 西瓜 Cl^-胁迫 保护酶 抗氧化剂
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Species-specific responses to drought,salinity and their interactions in Populus euphratica and P.pruinosa seedlings 被引量:3
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作者 Lei Yu Haojie Dong +3 位作者 Zhijun Li Zhanjiang Han Helena Korpelainen Chunyang Li 《Journal of Plant Ecology》 SCIE CSCD 2020年第5期563-573,共11页
Aims Drought and salinity are severe abiotic stress factors,which limit plant growth and productivity,particularly in desert regions.In this study,we employed two desert poplars,Populus euphratica Oliver and Populus p... Aims Drought and salinity are severe abiotic stress factors,which limit plant growth and productivity,particularly in desert regions.In this study,we employed two desert poplars,Populus euphratica Oliver and Populus pruinosa Schrenk seedlings,to compare their tolerance to drought,salinity and combined stress.Methods We investigated species-specific responses of P.euphratica and P.pruinosa in growth,photosynthetic capacity and pigment contents,nonstructural carbohydrate concentrations,Cl−allocation,osmotic regulation and the accumulation of reactive oxygen species(ROS)under drought,salinity and the combined stress.Important Findings Populus pruinosa exhibited greater growth inhibitory effects,photosynthesis decline,stomatal closure and ROS accumulation,and lower antioxidant enzyme activities and osmotic regulation compared with P.euphratica under drought,salinity and especially under their combined stress.On the other hand,salt-stressed P.euphratica plants restricted salt transportation from roots to leaves,and allocated more Cl−to coarse roots and less to leaves,whereas salt-stressed P.pruinosa allocated more Cl−to leaves.It was shown that there is species-specific variation in these two desert poplars,and P.pruinosa suffers greater negative effects compared with P.euphratica under drought,salinity and especially under the combined stress.Therefore,in ecological restoration and afforestation efforts,species-specific responses and tolerances of these two poplar species to drought and salinity should be considered under climate change with increasing drought and soil salinity developing. 展开更多
关键词 desert poplars drought and salinity Cl−allocation and transportation coarse and fine roots tolerance
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