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Effect of Drought Stress with Exogenous Ca2+on Relative Water Content and  the Characteristics of Photosynthesis of  Koelreuteria paniculata(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2013年10期
Page:
58-62
Research Field:
Publishing date:

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Title:
Effect of Drought Stress with Exogenous Ca2+on Relative Water Content and  the Characteristics of Photosynthesis of  Koelreuteria paniculata
Author(s):
CAI Xi-yue1; CHEN Xiao-de1; LIU Cheng1; ZHANG Shu-qin2; FAN Ting-xing1
1.Key Laboratory of Ecoenvironments in the Three Gorges Reservoir Region(Ministry of Education)，Chongqing Key Laboratory of Plant Ecology and Resources Research in the Three Gorges Reservoir Region，College of Life Science,Southwest University,Chongqing 400715；
2.Guang’an Vocational College of Technology，Guang’an，Sichuan 638000
Keywords:
Koelreuteria bipinnata; drought stress; exogenous calcium; relative water content; photosynthesis
PACS:
S 687.1
DOI:
-
Abstract:
Taking the seedlings of Koelreuteria bipinnata as material,weighing control water to simulate drought,the influence of exogenous calcium on relative water content and the characteristics of photosynthesis at different drought stress were studied.The results showed that processing of exogenous calcium was conducive to overall ease influence of seedlings in the arid environment，and to ensure the normal growth of the plants in the face of adversity.For the relative water content，the more serious the stress，the greater the falling.But,the same stress level with  non calcium group,exogenous calcium treatment,the amplitude as well as speed of the drop of RWC reduced,and the RWC can not back to the control level in the calcium group.For the influence of the photosynthetic characteristics,seedlings took the strategy that lower photosynthetic，lower transpiration，higher water use efficiency to adapt to the drought environment.Through the exogenous calcium treatment，the speed and amplitude of photosynthetic rate reduction decreased，and further reduction of transpiration，at the same time the reduction of stomatal conductance was limited，and improved the water use efficiency at drought conditions.

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Last Update: 2014-08-15