摘要
光抑制现象普遍存在于自然条件下生长的植物中,为了物种的延续,植物在长期的适应和进化过程中,形成了多种光抑制防御机制。臭柏（Sabina vulgaris Ant.）是毛乌素沙地唯一的天然常绿针叶灌木,在沙漠强光环境下完成更新,其热耗散等光抑制防御机制必然发挥重要作用。通过简要综述植物光抑制现象,以及强光下植物主要的光抑制防御机制,对臭柏光抑制防御机制研究现状进行梳理和展望。总体而言,有关臭柏光抑制防御机制的研究尚属初步探索阶段,臭柏应对光抑制的生理机理和分子机制尚不明确,从分子层面研究毛乌素沙地臭柏抵御光抑制的机制,可揭示臭柏是如何通过光抑制防御机制来适应恶劣的沙漠环境。
Photoinhibition is common in plants which grow under natural conditions. For the duration of species,plants have developed a variety of photoinhibition defense mechanisms during their long-term adaptation and evolution,such as the exercise to avoid light by leaves and chloroplasts,photorespiration,active oxygen scavenging system,conversion of light harvesting pigment,protection by phenolic compounds（ anthocyanin,for example）,increasing non-photochemical dissipation,depending on the xanthophyll cycle thermal dissipation,and accelerating the turnover of D1 protein. Sabina vulgaris Ant. is the only natural evergreen coniferous shrub in the Mu Us Sandland,it has a strong vitality,a wide range of adaptability,good ecological function and high medical value. The photoinhibition defense mechanisms,such as the heat dissipation mechanism,play an important role during the natural regeneration of S. vulgaris in the desert with strong light environment. In this paper,the photoinhibition of plants and the main photoinhibition defense mechanisms in plants under strong light were reviewed. Light energy is the power source and the basic driving force of photosynthesis,energy shortage restricts photosynthesis,and photoinhibition of photosynthesis caused by light energy exceeds the photosynthesis need. Under strong light stress,photosynthetic pigment antenna absorbing the excessive solar light causes photoinhibition,and then affects the photosynthetic metabolism. Although the light is the direct reason of plant photoinhibition,drought and low or high temperature stress caused by saline and seasonal change lead indirectly to plant photoinhibition. There are two situations for photoinhibition： One is that plant can recover after suffering from photoinhibition,strong light provides more photochemical effect than the leaf photosynthesis,and photosynthesis process overload could cause lower photonutilization and lower photosynthetic quantum yield,this situation occurs often in the sun plants,which depends on the energy dissipatio
作者
张金玲
陈海鹏
程达
李玉灵
ZHANG Jin-ling;CHEN Hai-peng;CHENG Da;LI Yu-ling(College of Forestry,Agricultural University of Hebei,Baoding 071000,Hebei,China)
出处
《干旱区研究》
CSCD
北大核心
2018年第4期882-890,共9页
Arid Zone Research
基金
河北省自然科学基金(C2011204096)
国家林业局林业公益性行业科研专项(201404214)
