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.)

Title:

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.)

Creator:

Kumagai, E., Araki, T., and Kubota, F.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:cf1fd656-6c38-4811-b31c-87d0828ce9dc
uuid:cf1fd656-6c38-4811-b31c-87d0828ce9dc
issn:0300-3604
doi:10.1007/s11099-007-0084-3

Subject:

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

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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 (PN), mesophyll conductance (g m), and stomatal conductance (gs) decreased. PN was more dominantly restricted by gm than gs. The values of PN, gm, 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 PN 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. and E. Kumagai, T. Araki, F. Kubota.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

489-495

Source:

Photosynthetica | 2007 Volume:45 | Number:4

Harvested from:

CDK

Metadata only:

false