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Leaf gas exchange characteristics,biomass partitioning,and water use efficiencies of two C4 African grasses under simulated drought

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Grassland Research 2023年第1期2卷 37-45页

作者： Kevin Z.Mganga jana kuhla Andrea Carminati Johanna Pausch Mutez A.Ahmed Copernicus Institute of Sustainable Development Utrecht UniversityUtrechtthe Netherlands Department of Agricultural Sciences South Eastern Kenya UniversityKituiKenya Bayreuth Center of Ecology and Environmental Research(BayCEER) University of BayreuthBayreuthGermany Department of Environmental Systems Science ETH ZurichZürichSwitzerland Department of Land Air and Water ResourcesUniversity of California DavisDavisCaliforniaUSA

Background:Few studies have evaluated the effect of drought on the morphophysiological characteristics of African C_(4) *** investigated how drought affects leaf gas exchange characteristics,biomass partitioning,and water use efficiencies of Enteropogon macrostachyus and Cenchrus ***:The grasses were grown in a controlled environment under optimum conditions,that is,70%of the maximum water‐holding capacity(WHC)for the first 40 ***,half of the columns were maintained under optimum or drought conditions(30%of maximum WHC)for another 20 ***:Under optimum conditions,*** showed a significantly higher photosynthetic rate,stomatal conductance,and transpiration rate than *** decreased the photosynthetic rate,stomatal conductance and transpiration rate only in *** net photosynthetic rate,stomatal conductance,and leaf transpiration of *** did not differ significantly under optimum and drought *** showed an increase in its water use efficiencies under drought to a greater extent than ***:Our results demonstrate that *** is more sensitive to drought than *** decrease in the intercellular CO_(2) concentration and the increase in stomatal limitation with drought in *** and *** suggest that stomatal limitation plays the dominant role in photosynthesis of the studied African C_(4) grasses.

关键词： biomass fractions C_(4)grasses drought photosynthesis stomatal conductance transpiration

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