《植物生理学报》 2012, 48(3): 232-240

两种热带雨林树苗对环境光强变化的生理响应和适应机制

王博轶*, 马洪军, 苏腾伟, 刘涛, 王齐

云南林业职业技术学院生物多样性保护与利用系, 昆明650224

通信作者：王博轶；E-mail: kingboywon@yahoo.com.cn；Tel: 0871-5010738

摘　要：

干季末雨季初以西双版纳热带雨林中木奶果和玉蕊2种树苗为材料, 研究了将生长于12.5%自然光(相当于小林窗的光强)和36%自然光(相当于大林窗的光强)下的这2种树苗分别移至36%自然光和12.5%自然光下之后各自叶片最大净光合速率(Pmax)、叶绿素荧光参数、光合色素含量、比叶重(LMA)以及叶片悬挂角(MA)的变化过程, 探讨了2种植物幼苗在生长环境光强改变后其形态和生理生态特性做出的相应调整以适应新的光环境的过程与机制。结果表明, 这2种树苗均不适宜生长在大林窗的强光环境下, 但木奶果对光环境的增强表现出一定的耐受力, 光合适应潜力强于玉蕊, 2种树苗对低光环境都能较好地适应；新叶的生成在整株植物对生长光环境变化的适应过程中也起到至关重要的作用。

关键词：光抑制; 光适应; 光合作用; 叶绿素荧光; 热带雨林树苗

收稿：2011-11-08   修定：2012-02-01

资助：国家自然科学基金(31100248)、云南省应用基础研究面上项目(2010ZC238)和云南省教育厅科学研究基金项目(2010Y216)。

Physiological Response and Acclimation to Changes in Light Regimes in Two Tropical Rainforest Species

WANG Bo-Yi*, MA Hong-Jun, SU Teng-Wei, LIU Tao, WANG Qi

Department of Biodiversity Conservation and Utilization, Yunnan Forestry Technological College, Kunming 650224, China

Corresponding author: WANG Bo-Yi; E-mail: kingboywon@yahoo.com.cn; Tel: 0871-5010738

Abstract:

Acclimation to light regimes and the strategies of photoprotection after the changing of growth light regimes [from high light regimes (36% of sunshine) to low light regimes (12.5% of sunshine) and from low light regimes (12.5% of sunshine) to high light regimes (36% of sunshine)] were explored in seedlings of two tropical rainforest tree species, Barringtonia macrostachya and Baccaurea ramiflora. The results showed that seedlings of the two species could acclimate to low growth light regimes well through some changes of physiological and morphological properties, but not to high growth light regimes. The acclimation capacity to high light regimes was stronger in B. ramiflora than in B. macrostachya. The formation of new leaves under new growth light regimes was very important to the growth and development in the seedlings of tropical tree species.

Key words: photoinhibition of photosynthesis; light acclimation; photosynthesis; chlorophyll fluorescence; tropical rainforest tree seedlings