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以一品红‘天鹅绒’幼苗为试材,利用人工气候箱研究了昼45℃/夜38℃高温胁迫处理对植株叶片相对电导率、O2.-产生速率、H2O2和丙二醛(MDA)含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性的影响。结果表明,在高温胁迫下,CAT、APX、SOD活性先升高,然后各自在0.5、1、2d时分别转为下降趋势;而POD活性则一直增加;相应地,2d内一品红的膜透性变化不大,2d后急剧增大;MDA含量2d内先升后降,2d后大幅度上升;O2.-产生速率、H2O2含量在2d后均快速上升。2d是‘天鹅绒’一品红耐受昼45℃/夜38℃高温胁迫的极限时间。
The relative conductivity, O2.- production rate, H2O2 and malondialdehyde (MDA) content of the leaves of poinsettia ’velvet’ were studied using artificial climate chamber at 45 ℃ / night at 38 ℃. The activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX). The results showed that under high temperature stress, CAT, APX and SOD activity increased at first, then decreased at 0.5, 1 and 2 d, respectively, while POD activity increased continuously. Correspondingly, the membrane permeability of poinsettia After 2 days, the content of MDA increased rapidly and then decreased significantly after 2 days. The production rate of O2.- and H2O2 increased rapidly after 2 days. 2d is the ’velvet’ poinsettia tolerance to high temperature stress of 45 ° C / night at 38 ° C.