TITLE

Effects of nitrogen application and elevated atmospheric CO2 on electron transport and energy partitioning in flag leaf photosynthesis of wheat

AUTHOR(S)
Zhang Xu-Cheng; Yu Xian-Feng; Ma Yi-Fan
PUB. DATE
March 2011
SOURCE
Yingyong Shengtai Xuebao;Mar2011, Vol. 22 Issue 3, p673
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Wheat (Triticum aestivum) plants were pot-cultured in open top chambers at the nitrogen application rate of 0 and 200 mg·kg-1 soil and the atmospheric CO2 concentration of 400 and 760 μmol·mol-1. Through the determination of flag leaf nitrogen and chlorophyll contents, photosynthetic rate (Pn)-intercellar CO2 concentration (Ci) response curve, and chlorophyll fluorescence parameters at heading stage, the photosynthetic electron transport rate and others were calculated, aimed to investigate the effects of nitrogen application and elevated atmospheric CO2 concentration on the photosynthetic energy partitioning in wheat flag leaves. Elevated atmospheric CO2 concentration decreased the leaf nitrogen and chlorophyll contents, compared with the ambient one, and the chlorophyll a/b ratio increased at the nitrogen application rate of 200 mg·kg-1. With the application of nitrogen, no evident variations were observed in the maximal photochemical efficiency (Fv/Fm), maximal quantum yield under irradiance (Fv′/Fm′) of PS II reaction center, photochemical fluorescence quenching coefficient (qp), and actual PS II efficiency under irradiance (FPS II) at elevated atmospheric CO2 concentration, and the total photosynthetic electron transport rate (JF) of PS II reaction center had no evident increase, though the non-photochemical fluorescence quenching coefficient (NPQ) decreased significantly. With no nitrogen application, the Fv′/Fm′, FPS II, and NPQ at elevated atmospheric CO2 concentration decreased significantly, and the JF had a significant decrease though the Fv/Fm and qp did not vary remarkably. Nitrogen application increased the JF and photochemical electron transport rate (JC); while elevated atmospheric CO2 concentration decreased the photorespiration electron transport rate (J0), Rubisco oxidation rate (V0), ratio of photorespiration to photochemical electron transport rate (J0/JC), and Rubisco oxidation/carboxylation rate (V0/VC), but increased the photochemical electron transport rate (JC) and Rubisco carboxylation rate (VC). It was concluded that elevated atmospheric CO2 concentration decreased the leaf nitrogen and chlorophyll contents, while nitrogen application increased the photosynthetic electron transport rate of PS II reaction center significantly, and promoted the photosynthetic electron flow towards photochemistry, making more photosynthetic electron take part in Rubisco carboxylation and leading to the significant increase of Pn.
ACCESSION #
63479598

 

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