Relations between Seedlings' Photosynthetic Characteristics and Their Drought Tolerance under Water Stress in Rocky Desertification Area

XU Li-xia; YANG Shui-ping; YAO Xiao-hua; LI Shen; REN Hua-dong

Water-controlling pot experiments were carried out on characteristics of photosynthesis and drought tolerance under water stress of 3 tree species:Zenia insignis,Catalpa fargesii f.duclouxii and Acacia dealbata from a rocky desertification area in Guizhou Province.The results were as follows:As stress increasing and time delaying,the net photosynthesis rate(Pn),transpiration,stomata conduct were gradually decreased but CO2 concentration in stomata was increased;the diurnal pattern of net photosynthetic rate shifted gradually from a typical single-peaked curve to a double-peaked one that signified midday depression of photosynthesis.The midday depression of photosynthesis under both light and heavier stress may be induced by a combination of stomatal limitation and non-stomatal factors,but under extreme drought conditions,induced mainly by the non-stomatal factors.The depressed Pn could recover when rehydrated under certain drought stress.By a comprehensive evaluation of Fuzzy mathematics,the ability of drought tolerance was arranged from strong to weak as following:Acacia dealbata>Zenia insignis>Catalpa fargesii f.duclouxii.

1. College of Resourse and Environment, Southwest China University, Chongqing 400716, China

2. Research Institute of Subtropical Forestry, CAF

3. Key Laboratory of Subtropical Tree Breeding and Cultivation, State Forestry Administration, Fuyang 311400, Zhejiang,

Received Date: 2005-12-26

Abstract: Water-controlling pot experiments were carried out on characteristics of photosynthesis and drought tolerance under water stress of 3 tree species:Zenia insignis,Catalpa fargesii f.duclouxii and Acacia dealbata from a rocky desertification area in Guizhou Province.The results were as follows:As stress increasing and time delaying,the net photosynthesis rate(Pn),transpiration,stomata conduct were gradually decreased but CO2 concentration in stomata was increased;the diurnal pattern of net photosynthetic rate shifted gradually from a typical single-peaked curve to a double-peaked one that signified midday depression of photosynthesis.The midday depression of photosynthesis under both light and heavier stress may be induced by a combination of stomatal limitation and non-stomatal factors,but under extreme drought conditions,induced mainly by the non-stomatal factors.The depressed Pn could recover when rehydrated under certain drought stress.By a comprehensive evaluation of Fuzzy mathematics,the ability of drought tolerance was arranged from strong to weak as following:Acacia dealbata>Zenia insignis>Catalpa fargesii f.duclouxii.

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Relations between Seedlings' Photosynthetic Characteristics and Their Drought Tolerance under Water Stress in Rocky Desertification Area

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