摘要
对大白花杜鹃(Rhododendron decorum) 、云南杜鹃(R.yunnanense) 和红棕杜鹃(R.rubiginosum)进行了气体交换、叶片性状等研究,以期了解三种杜鹃的光合生理特性及其对环境的适应。结果表明,三种杜鹃的光饱和光合速率(Pmax)与RuBP 饱和最大羧化速率(Vc max)、光饱和最大电子传递速率(Jmax)和气孔导度(gs) 呈极显著正相关(P≤0.01) ,但仅 Vc max存在显著的种间差异,说明三种杜鹃的光合能力主要受 Vc max影响。叶氮含量、叶片氮在电子传递和在Rubisco中的分配均显著影响 Vc max和 Jmax。大白花杜鹃的 LSP 最低,LCP 较高,对强光和弱光利用能力都不强,光适应范围较窄。云南杜鹃 LCP 最低,LSP和Pmax相对较高,对弱光或较强的光照均能利用,光照适应范围相对最广,光合适应能力最强; 红棕杜鹃LSP和LCP 均为最高,对强光环境的适应性最强。
To understand the photosynthetic characteristics of three species of genus Rhododendron （ R. decorum, R. yunnanense and R. rubiginosum）, their gas exchanges and related leaf traits were investigated. The results showed that among the three species, light-saturated photosynthetic rate （ Pmax ） was significantly correlated to maximum rate of RuBP-mediated carboxylation （Vc max ）, maximum electron transport rate （Jmax） and stomatal conductance （gs） respec-tively （P≤〈0. 01 ）, but only the value for Vc max of three species was significantly different suggesting that photosynthesis of the three species was primarily limited by the Vc max. leaf nitrogen content, partitioning coefficients for leaf nitrogen in bioenergeties and in Rubisco were significantly related to Vc max and Jmax.R. decorum had a lower light saturation point （LSP） and higher light compensation point （LCP）, a narrow range of light adaptability than the others. R. yunnanense showed the lowest LCP across species, but relatively high LSP, Pmax and a wider range of light adaptability. R. rubi-ginosum had the highest LCP and LSP, indicating that the photosynthesis of this species can adapt to high light.
出处
《植物分类与资源学报》
CAS
CSCD
北大核心
2013年第1期17-25,共9页
Plant Diversity
基金
云南省科技创新强省计划(2008AB04)
关键词
杜鹃
光合速率
叶片性状
光照
Rhododendron
Photosynthesis
Leaf traits
Light intensity
