biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 52:307-313, 2008 | DOI: 10.1007/s10535-008-0064-x

Water-water cycle involved in dissipation of excess photon energy in phosphorus deficient rice leaves

X. -Y. Weng1,*, H. -X. Xu1, Y. Yang1, H. -H. Peng1
1 National Laboratory of Plant Physiology and Biochemistry, Department of Biological Science, College of Life Science, Zhejiang University, Hangzhou, Zhejiang, China

The water-water cycle which may be helpful for dissipating the excitation pressure over electron transport chain and minimizing the risk of photoinhibition and photodamage was investigated in rice after 10-d P-deficient treatment. Net photosynthetic rate decreased under P-deficiency, thus the absorption of photon energy exceeded the energy required for CO2 assimilation. A more sensitive response of effective quantum yield of photosystem 2 (ΦPS2) to O2 concentration was observed in plants that suffered P starvation, indicating that more electrons were transported to O2 in the P-deficient leaves. The electron transport rate through photosystem 2 (PS 2) (Jf) was stable, and the fraction of electron transport rate required to sustain CO2 assimilation and photorespiration (Jg/Jf) was significantly decreased accompanied by an increase in the alternative electron transport (Ja/Jf), indicating that a considerable electron amount had been transported to O2 during the water-water cycle in the P-deficient leaves. However, the fraction of electron transport to photorespiration (Jo/Jf) was also increased in the P-deficient leaves and it was less sensitive than that of water-water cycle. Therefore, water-water cycle could serve as an efficient electron sink. The higher non-photochemical fluorescence quenching (qN) in the P-deficient leaves depended on O2 concentration, suggesting that the water-water cycle might also contribute to non-radiative energy dissipation. Hence, the enhanced activity of the water-water cycle is important for protecting photosynthetic apparatus under P-deficiency in rice.

Keywords: Oryza sativa; net photosynthetic rate; stomatal conductance; intercellular CO2 concentration; photosystem 2; chlorophyll a fluorescence; non-photochemical and photochemical quenching; photorespiration
Subjects: chlorophyll fluorescence; CO2 concentration, internal; gas exchange; Oryza sativa; photochemical efficiency, quenching; photon flux density; photosystem 1,2; polymerase chain reaction (PCR); proteins; respiration; rice; stomatal conductance

Received: January 23, 2006; Accepted: October 25, 2006; Published: June 1, 2008  Show citation

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Weng, X.-Y., Xu, H.-X., Yang, Y., & Peng, H.-H. (2008). Water-water cycle involved in dissipation of excess photon energy in phosphorus deficient rice leaves. Biologia plantarum, 52(2), 307-313. doi: 10.1007/s10535-008-0064-x
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