Cultivar differences in photosynthetic tolerance to photooxidation and shading in rice (Oryza sativa L.)

Title:

Cultivar differences in photosynthetic tolerance to photooxidation and shading in rice (Oryza sativa L.)

Creator:

Jiao, Demao and Li, Xia

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:1bea7085-a8ec-4c10-a8be-038ea62d7431
uuid:1bea7085-a8ec-4c10-a8be-038ea62d7431
issn:0300-3604
doi:10.1023/A:1013758504857

Subject:

chlorophyll, grain, irradiance, net photosynthetic rate, photooxidation, photosynthetic characteristics, photosystems 1 and 2, ribulose-1,5-bisphosphate carboxylase, shoot dry mass, and superoxide dismutase

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Forty-four genotypes from the rice germplasm were identified under photoinhibition/photooxidation and shade conditions and divided into four basic types: (1) cultivars tolerant to both photooxidation and shading, (2) cultivars tolerant to photooxidation but sensitive to shading, (3) cultivars tolerant to shading but sensitive to photooxidation, and (4) cultivars sensitive to both photooxidation and shading. Photosynthetic characteristics of a cultivar tolerant (cv. Wuyugeng 3) and a cultivar sensitive (cv. Xiangxian) to photooxidation and shading were compared. The photochemical efficiency (Fv/Fm) of photosystem 2 (PS2) and the content of PS2-D1 protein in the tolerant cultivar Wuyugeng 3 decreased less under photooxidative conditions as compared with Xiangxian. Under similar conditions, superoxide dismutase was induced rapidly to a higher activity and the active oxygen (O-) built up to a lower level in Wuyugeng 3 than in Xiangxian. Net photosynthetic rate (PN) decreased by 23 % in Wuyugeng 3 vs. 64 % in Xiangxian. Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and PN in Wuyugeng 3 but severe decreases (57-64 %) were observed in Xiangxian which corresponded to the decreases in grain yield of the two cultivars (38 and 73 %, respectively). We described a simple and effective screening method and physiological basis for breeding crops for enhanced tolerance to both high and low irradiance. and Demao Jiao, Xia Li.

Language:

Multiple languages

Rights:

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

Coverage:

167-175

Source:

Photosynthetica | 2001 Volume:39 | Number:2

Harvested from:

CDK

Metadata only:

false