Photosynthetic Physiological Adaptation Mechanism of Jatropha curcas
 Seedling in Different Water Conditions

LIU Yong-an; LUO Xiao-ming; WEI Jian-guo; YANG Hong-bin; Toshiaki Endo; HU Ting-xing

Effects of drought and re-water on leaf relative water content (LRWC), gas exchange characteristics and chlorophyll fluorescence characteristics of Jatropha curcas seedlings in different water conditions were studied. The results are as following: with the decreasing of soil volumetric water content(SVWC), the leaf relative water content, photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) of J. curcas declined gradually. Intercellular CO2 concentration (Ci) decreased at first, and then increased when SVWC was lower than 8.70%. Maximal fluorescence yield (Fm), PSII maximum quantum yield of light (Fv/Fm), photochemical quenching (qP) and actual quantum yield of PSII photochemistry (ΦPSⅡ) were shown a downward trend, while the initial fluorescence (Fo) slightly increased. After re-water, the gas exchange parameters and fluorescence parameters could be quickly restored and the plant could survive, indicating that J. curcas has strong self-regulating ability and strong adaptability to the drought stress. When SVWC was between 21.91% and 15.22%, parameters of gas exchange and chlorophyll fluorescence were not significant(P>0.05) . As SVWC declined from 8.70% to 6.81%, parameters of gas exchange and chlorophyll fluorescence changed obviously. Therefore, it is suggested that when SVWC was above 8.70%,the decreased carbon assimilation capacity of J. curcas was mainly due to stomatal limitation,and when SVWC was lower than 8.70%, the decreased carbon assimilation capacity of J. curcas was mainly due to non-stomatal limitation.

Photosynthetic Physiological Adaptation Mechanism of Jatropha curcas Seedling in Different Water Conditions

1. Sichuan Provincial Key Laboratory of Ecological Forestry Engineering, Sichuan Agricultural University, Ya'an 625014, Sichuan,China

2. Forest Institute of Liangshan Prefecture, Xichang 615021, Sichuan,China

3. Forest Bureau of Liangshan Prefecture, Xichang 615000,Sichuan,China

4. Forestry and Products Research Institute, Tsukuba, Ibaraki, Japan 305-8687

Abstract: Effects of drought and re-water on leaf relative water content (LRWC), gas exchange characteristics and chlorophyll fluorescence characteristics of Jatropha curcas seedlings in different water conditions were studied. The results are as following: with the decreasing of soil volumetric water content(SVWC), the leaf relative water content, photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) of J. curcas declined gradually. Intercellular CO2 concentration (Ci) decreased at first, and then increased when SVWC was lower than 8.70%. Maximal fluorescence yield (Fm), PSII maximum quantum yield of light (Fv/Fm), photochemical quenching (qP) and actual quantum yield of PSII photochemistry (ΦPSⅡ) were shown a downward trend, while the initial fluorescence (Fo) slightly increased. After re-water, the gas exchange parameters and fluorescence parameters could be quickly restored and the plant could survive, indicating that J. curcas has strong self-regulating ability and strong adaptability to the drought stress. When SVWC was between 21.91% and 15.22%, parameters of gas exchange and chlorophyll fluorescence were not significant(P>0.05) . As SVWC declined from 8.70% to 6.81%, parameters of gas exchange and chlorophyll fluorescence changed obviously. Therefore, it is suggested that when SVWC was above 8.70%,the decreased carbon assimilation capacity of J. curcas was mainly due to stomatal limitation,and when SVWC was lower than 8.70%, the decreased carbon assimilation capacity of J. curcas was mainly due to non-stomatal limitation.

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Photosynthetic Physiological Adaptation Mechanism of Jatropha curcas Seedling in Different Water Conditions

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通讯作者: 陈斌, bchen63@163.com

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