6-BA预处理对低温弱光胁迫下辣椒幼苗叶绿素a荧光参数和膜脂过氧化的

研究6-BA预处理对低温（15℃/5℃）弱光（100μmol·m^-2·s^-1）下辣椒品种‘湘研16号’幼苗叶片中叶绿素a荧光参数和膜脂过氧化影响。结果表明，0．08mmol·L^-16-BA减缓低温弱光下辣椒幼苗光系统II（PSII）最大光化学效率（Fv/Fm）、PSH实际光化学效率（ΦPSII）和PSII反应中心光能捕获效率（Fv’/Fm’）的下降以及叶片膜透性和丙二醛（malondialdehyde，MDA）含量的增加，但是提高了超氧化物歧化酶（superoxidedismutase，SCD）、过氧化物酶（peroxidase，POD）、过氧化氢酶（catalase，CAT）以及抗坏血酸过氧化物酶（ascorbate peroxidase，APX）的活性。

Effects of 6-BA Pretreatment on Chlorophyll Fluorescence Parameter and Lipid Peroxodatio in Pepper Seedlings under Low Temperature and Weak Light Stress

The effects of 6-BA pretreatment on chlorophyll fluorescence parameters and lipid peroxodation in pepper seedling leaves under low temperature and weak light （15℃/5℃, 100μmol·m^-2·s^-1） stress were investigated. The results showed that 0.08 mmol·L^-16-BA pretreatment alleviated the decreases of the maximal photochemical efficiency of photosystem II （Fv/Fm）, the actual photochemical efficiency of photosystem II （Opsii） and the efficiency of open photosystem II centers （Fv＇/Fm＇） in chilled pepper seedling leaves under weak light. Furthermore, 0.08 mmol-L16-BA pretreatment decreased the increase of the permeability cell membrane and the malondialdehyde （MDA） production in chilled pepper seedling leaves under weak light. But 0.08 mmol·L^-1 6-BA pretreatment enhanced the activities of antioxidant enzymes including superoxide dismutase （SOD）, peroxidase （POD）, catalase （CAT） and ascorbate peroxidase （APX） in the chilled pepper seedling leaves under weak light stress.