臭氧与干旱胁迫对华南地区3种绿化树种荧光生理的影响

    Effects of ozone and drought on fluorescence physiology of seedlings of three afforestation tree species in South China

    • 摘要:
      目的 了解尖叶杜英Elaeocarpus apiculatus、米老排Mytilaria laosensis和藜蒴Castanopsis fissa的抗臭氧和干旱生理机制,为华南地区筛选抗逆树种提供参考.
      方法 以3种幼苗为研究对象,进行人工臭氧熏气和干旱处理后,测定其叶绿素荧光参数时间动态.
      结果和结论 随着胁迫处理时间的延长最小初始荧光(F0)先升后降,PSⅡ最大光化学效率(Fv/Fm)保持稳定;臭氧胁迫的PSⅡ实际光量子效率Y(Ⅱ)先降后升,其余处理的保持稳定;尖叶杜英的非光化学淬灭(NPQ)保持稳定,其余幼苗的先升后降.主成分分析表明,幼苗抗臭氧胁迫和干旱胁迫的能力为:黎朔>尖叶杜英>米老排,幼苗抗臭氧和干旱交叉胁迫的能力为:尖叶杜英>黎朔>米老排.总体来看,臭氧胁迫和干旱胁迫下,3种幼苗能够启动光保护作用的调节机制,具有一定的抗臭氧或干旱的能力.

       

      Abstract:
      Objective This study was conducted to demonstrate the fluorescent physiology of ozone resistance and drought physiology mechanism in the seedlings of three native tree species and provide reference for screening stress-resistant tree species in South China.
      Method Seedlings of Elaeocarpus apiculatus, Mytilaria laosensis and Castanopsis fissa were treated with ozone fumigation and drought condition, and their chlorophyll fluorescence parameters were determined.
      Result and conclusion The results showed that with increasing treatment time, minimal initial fluorescence (F0) of the three seedling types increased and then decreased, and their PSⅡ maximum photochemical efficiency (Fv/Fm) remained stable; active quantum efficiency of PSⅡY (Ⅱ) treated with ozone stress decreased, followed by an increase and other treatments remained stable; non-photochemical quenching (NPQ) of E. apiculatus seedlings remained stable and other seedling types increased and then decreased. Principal component analyses showed that resistance of the three seedling types to ozone stress and drought stress was C. fissa > E. apiculatus > M. laosensis, whereas their resistance to intercross stress of ozone and drought was E. apiculatus > C. fissa >M. laosensis. In general, the three seedling types have a certain ability to resist ozone or drought by starting an adjustment mechanism of photoprotection under ozone stress or drought stress.

       

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