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不同光质对木荷、杉木幼苗叶片叶绿素荧光参数和抗氧化酶活性的影响

刘青青1,2,马祥庆1,2,黄智军1,2,李艳娟1,2,庄正1,2,朱晨曦1,2,刘博1,2*   

  1. 1福建农林大学林学院, 福州 350002;2国家林业局杉木工程技术研究中心, 福州 350002)
  • 出版日期:2018-03-10 发布日期:2018-03-10

Effects of light quality on leaf chlorophyll fluorescence parameters and antioxidant enzyme activities of Schima superba andCunninghamia lanceolataseedlings.

LIU Qing-qing1,2, MA Xiang-qing1,2, HUANG Zhi-jun1,2, LI Yan-juan1,2, ZHUANG Zheng1,2, ZHU Chen-xi1,2, LIU Bo1,2*   

  1. (1College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2State Forestry Administration Engineering Research Center of Chinese Fir, Fuzhou 350002, China).
  • Online:2018-03-10 Published:2018-03-10

摘要: 以南方主要造林树种木荷和杉木幼苗为试验材料,研究了红光、蓝光和白光处理对幼苗叶片叶绿素荧光参数和抗氧化酶活性的影响。结果表明,木荷幼苗叶片初始荧光(Fo)、最大荧光(Fm)、可变荧光(Fv)和稳态荧光(Ft)均以白光最高,光系统Ⅱ(PSⅡ)最大光化学效率(Fv/Fm)、PSⅡ潜在光化学效率(Fv/Fo)和PSⅡ的天线转换效率(Fv′/Fm′)均以白光最高,蓝光次之,红光最低。与白光处理相比,蓝光处理增强木荷幼苗叶片超氧化物歧化酶(SOD)活性,红光和蓝光降低过氧化氢酶(CAT)活性,增强过氧化物酶(POD)活性,提高叶片丙二醛(MDA)含量。杉木幼苗叶片FoFt以红光最高,FmFv以白光最高,Fv/FmFv/FoFv′/Fm′均以白光最高,蓝光次之,红光最低。不同处理间杉木幼苗叶片SOD、CAT活性和MDA含量均无显著差异,而POD活性差异显著,以白光处理最高。光质对2种树种幼苗的生长均具有调控作用,其中红光和蓝光处理均造成木荷和杉木幼苗叶片的潜在活力发生不同程度的下降,造成光胁迫,同时破坏幼苗叶片抗氧化酶系统的平衡,不利于幼苗生长。

关键词: 小麦, 水分利用, 光合特性, 产量, 水肥一体化

Abstract: This study explored the effects of different light qualities (red, blue, and white) on chlorophyll fluorescence parameters and antioxidant enzyme activities in leaves of Schima superba andCunninghamia lanceolata seedlings. The results showed that original fluorescence (Fo), maximal fluorescence (Fm), variable fluorescence (Fv) and steady state fluorescence (Ft) ofS. superba seedling leaves were the highest under the white light. The photochemical efficiency (Fv/Fm), potential activity (Fv/Fo) and antenna transfer efficiency (Fv′/Fm′) of PSII reaction center under different treatments followed trend: white light > blue light > red light. Compared to the white light, the blue light significantly increased the activity of superoxide dismutase (SOD). The red and blue light decreased the activity of catalase (CAT) but increased the activities of peroxidase (POD) and the content of malonaldehyde (MDA).Foand Ft ofC. lanceolata seedlings were the highest under the red light.Fm andFv were the highest under the white light.Fv/Fm,Fv/Fo andFv′/Fm′ratios were the highest under the white light, followed by the blue and red light treatments. Light quality had no significant effect on SOD activity, CAT activity and MDA content ofC. lanceolata seedling leaves, while it had significant effects on POD activity, with a highest value under the white light. In short, light quality would regulate the seedling growth of both tree species examined here. The potential vitality of S. superba andC. lanceolata seedlings decreased under red and blue light treatments due to light stress and unbalanced antioxidant enzyme system. Consequently, red and blue light would be unfavorable for seedling growth.

Key words: water use, water-fertilizer integration, photosynthetic characteristics, grain yield, wheat