Photosynthetic Ecophysiology of Three Species of Genus Rhododendron

doi:10.7677/ynzwyj201312056

Abstract

Abstract:

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) respectively (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 bioenergetics 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.rubiginosum had the highest LCP and LSP, indicating that the photosynthesis of this species can adapt to high light.

Key words: Rhododendron, Photosynthesis, Leaf traits, Light intensity

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。

关键词: 杜鹃, 光合速率, 叶片性状, 光照

CLC Number:

Q 945

YANG Ting-, XU Kun-, YAN Ning-, LI Shu-Yun-, HU Hong. Photosynthetic Ecophysiology of Three Species of Genus Rhododendron[J]. Plant Diversity, 2013, 35(1): 17-25.

杨婷1、2, 许琨3, 严宁1, 李树云1, 胡虹1. 三种高山杜鹃的光合生理生态研究[J]. Plant Diversity, 2013, 35(1): 17-25.

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