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园艺学报 ›› 2012, Vol. 39 ›› Issue (1): 175-181.

• 研究报告 • 上一篇    下一篇

高温对耐热大葱品种PSⅡ和抗氧化酶活性的影响

梁 雪1,颜 坤2,梁 燕1,张雯婷1,魏佑营1,*,董新纯1,孟庆伟1,赵世杰1,*   

  1. (1作物生物学国家重点实验室,山东省作物生物学重点实验室,山东农业大学生命科学学院,山东泰安271018;2中国科学院烟台海岸带研究所,山东烟台264003)
  • 收稿日期:2011-10-09 修回日期:2011-12-05 出版日期:2012-01-25 发布日期:2012-01-25
  • 通讯作者: 魏佑营,赵世杰

Effects of High Temperature on PSII and Antioxidant Enzymes Activities in Heat-Tolerant Scallion

LIANG Xue1,YAN Kun2,LIANG Yan1,ZHANG Wen-Ting1,WEI You-ying1,*,DONG Xin-chun1,MENG Qing-Wei1,and ZHAO Shi-Jie1,*   

  1. (1State Key Lab of Crop Biology,Shandong Key Laboratory of Crop Biology,College of Life Sciences,Shandong Agricultural University,Tai’an,Shandong 271018,China;2Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai,Shandong 264003,China)
  • Received:2011-10-09 Revised:2011-12-05 Online:2012-01-25 Published:2012-01-25
  • Contact: WEI You-ying, ZHAO Shi-Jie

摘要: 以‘章丘大葱’为对照,研究了25 ~ 50 ℃下耐热大葱品种‘春味’、‘吉叶晚抽’和‘长悦’叶片丙二醛含量,电解质外渗率,叶绿素荧光参数和抗氧化酶活性的变化。结果表明,高温下耐热大葱品种叶片光系统Ⅱ(PSⅡ)最大光化学效率的下降和电解质外渗率的增加幅度小于章丘大葱,说明耐热大葱品种PSⅡ和细胞膜热稳定性高于章丘大葱。高温下,3个耐热大葱品种和章丘大葱叶片超氧化物歧化酶(SOD)、过氧化物酶(CAT)、抗坏血酸过氧化物酶(APX)活性上升,但耐热品种上升幅度显著高于章丘大葱,表明其叶片抗氧化能力较高。因此,耐热大葱品种叶片较高的抗氧化酶活性是其耐热性较强的原因之一。

关键词: 大葱, 耐热性, 叶绿素荧光, 抗氧化酶

Abstract: Using‘Zhangqiu Dacong’scallion as control,changes of malondialdehyde(MDA)content,electrolyte leakage,chlorophyll fluorescence parameters and antioxidant enzyme activities were studied in leaves of heat-tolerant scallion,‘Chunwei’,‘Jiye Wanchou’And‘Changyue’,at 25–50 ℃. The results showed that the extent of decrease in the maximum photochemical efficiency of photosystem Ⅱ and of the increase in electrolyte leakage in leaves of the heat-tolerant scallion was less than that in leaves of the ‘Zhangqiu Dacong’scallion at high temperature,indicating that the thermostability of photosystem Ⅱ and cell membrane was higher in the heat-tolerant scallion than that in the‘Zhangqiu Dacong’scallion. At high temperature,the activities of superoxide dismutase(SOD),catalase(CAT)and ascorbate peroxidase(APX)increased in leaves of the heat-tolerant scallion and‘Zhangqiu Dacong’scallion,but the increase extent was greater in the summer scallion,which suggests that heat-tolerant scallion had a higher antioxidant capacity than the‘Zhangqiu Dacong’scallion did. Having higher antioxidant ability is one of the reasons for higher heat tolerance in the leaves of heat-tolerant scallion.

Key words: summer scallion, heat tolerance, chlorophyll fluorescence, antioxidant enzymes

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