Photosynthetica, 2007 (vol. 45), issue 4

Photosynthetica 2007, 45(4):489 | DOI: 10.1007/s11099-007-0084-3

Effects of nitrogen supply restriction on gas exchange and photosystem 2 function in flag leaves of a traditional low-yield cultivar and a recently improved high-yield cultivar of rice (Oryza sativa L.)

E. Kumagai1,*, T. Araki2, F. Kubota2
1 Laboratory of Plant Production Physiology, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka, Japan
2 Faculty of Agriculture, Kyushu University, Hakozaki, Higashi-ku, Fukuoka, Japan

The effects of nitrogen (N) supply restriction on the CO2 assimilation and photosystem 2 (PS2) function of flag leaves were compared between two contrastive Japanese rice cultivars, a low-yield cultivar released one century ago, cv. Shirobeniya (SRB), and a recently improved high-yield cultivar, cv. Akenohoshi (AKN). Both cultivars were solution-cultured at four N supply levels from N4 (control) to N1 (the lowest). With a reduction in N-supply, contents of N (LNC), ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO), and chlorophyll (Chl) in flag leaves decreased in both cultivars. In parallel with this, the net photosynthetic rate (P N), mesophyll conductance (g m), and stomatal conductance (g s) decreased. P N was more dominantly restricted by g m than g s. The values of P N, g m, and RuBPCO content were larger in AKN than SRB at the four N supply levels. The content of Chl greatly decreased with N deficiency, but the reduction in the maximum quantum yield of PS2 was relatively small. Quantum yield of PS2 (ΦPS2) decreased with N deficiency, and its significant cultivar difference was observed between the two cultivars at N1: a high value was found in AKN. The content ratio of Chl/RuBPCO was also significantly low in AKN. The low Chl/RuBPCO is one of the reasons why AKN maintained a comparatively high P N and ΦPS2 at N deficiency. The adequate ratio of N distribution between Chl and RuBPCO is the important prerequisite for the efficient and sustainable photosynthesis in a flag leaf of rice plant under low N-input.

Keywords: chlorophyll; chlorophyll fluorescence; dry matter production; leaf area; mesophyll conductance; net photosynthetic rate; non-photochemical quenching; quantum yield; ribulose-1,5-bisphosphate carboxylase, oxygenase; stomatal conductance

Received: December 5, 2006; Accepted: March 6, 2007; Published: December 1, 2007Show citation

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Kumagai, E., Araki, T., & Kubota, F. (2007). Effects of nitrogen supply restriction on gas exchange and photosystem 2 function in flag leaves of a traditional low-yield cultivar and a recently improved high-yield cultivar of rice (Oryza sativa L.). Photosynthetica45(4), 489. doi: 10.1007/s11099-007-0084-3.
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