Response of Photosynthetic Characteristics of the Flag Leaves at Rice Full Heading Time to Elevated CO2Concentration under Soda-salinization Stress

doi:10.7668/hbnxb.2009.01.003

Abstract

Abstract: The effect of elevated CO₂concentration on photosynthetic characteristics of the flag leaves at rice fullheading time was studied under soda-salinization stress. The response of photosynthetic rate (Pn) can be divided into threeperiods ainear increase period under low intercellular CO₂ concentration (Ci); smooth increase period under moderate Ci;dynamic balance period under high Ci.But soda-salinization stress decreasedphotosynthetic rate(Pn) and carboxylation eficiency(CE) at each intercellular CO₂ concentration (Ci) as well as enhanced the compensation point of CO₂. Also,thechanges of stomatal conductance(Cs) can be divided two periods ainear decrease period under low Ci; smooth decrease pe-riod under moderate and high Ci.And the trends of transpiration rate (Tr) is the same to those of Gs. Compared with nonsoda salinization stress (NS), Gs and Tr decreased under soda- salinization stress (S) at the same Ci.However soda-saliniza-tion stress enhanced water use efficiency(WUE).

Key words: Rice, Soda sodicity, CO₂ concentration, Photosynthetic physiological characteristics

CLC Number:

S511.01

YANG Fu, LIANG Zheng-wei, WANG Zhi-chun, CHEN Yuan. Response of Photosynthetic Characteristics of the Flag Leaves at Rice Full Heading Time to Elevated CO₂Concentration under Soda-salinization Stress[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(1): 7-10. doi: 10.7668/hbnxb.2009.01.003.

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