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Impact of high temperature stress on photosynthetic characteristic and yield of rice (Oryza sativa) at heading

Indian Agricultural Research Journals

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Title Impact of high temperature stress on photosynthetic characteristic and yield of rice (Oryza sativa) at heading
 
Creator XIE, XIAO JIN
LI, BIN BAI
SHEN, SHUANG HE
 
Subject Heading
High temperature stress
Photosynthetic characteristic
Rice
Yield
 
Description To estimate impact of high temperature stress on photosynthetic characteristic and yield in rice (Oryza sativa L.), a pot experiment was conducted during 2008 in environment-controlled chambers with two rice cultivars (Yangdao 6 and Nanjing 44) under high temperature stresses (35°C/3d, 35°C/5d, 39°C/3d and 39°C/5d) at heading. The results showed that rice grain yield, chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD) and leaf area index (LAI) presented a sharply decline, and the relative conductivity, malondialdehyde content (MDA) increased gradually with the elevation of stress temperature and extension of stress time. The increasing rate (reduction rate) of some physiological and biochemical indexes in Yangdao 6 were lower than that in Nanjing 44 compared with the CK under the same temperature stress. It was showed that response of Nanjing 44 to high temperature was stronger than that of Yangdao 6. In accordance with correlation analysis, the rice grain yield showed a positive correlation with NPn and LAI (P<0.01), and the correlation coefficients of them were 0.93 and 0.89 respectively. Further, the correlation between rice grain yield and DW after early stage of maturing, the export percentage of the matter in stem-sheath (EPMSS) and the transformation percentage of the matter in stem-sheath (TPMSS) were not significant. It was showed that rice grain yield under high temperature stress originated mainly from leaves photosynthesis and LAI after heading.
 
Publisher Indian Council of Agricultural Research
 
Date 2012-06-06
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
 
Format application/pdf
 
Identifier https://epubs.icar.org.in/index.php/IJAgS/article/view/19014
10.56093/ijas.v82i6.19014
 
Source The Indian Journal of Agricultural Sciences; Vol. 82 No. 6 (2012); 516–22
2394-3319
0019-5022
 
Language eng
 
Relation https://epubs.icar.org.in/index.php/IJAgS/article/view/19014/9362
 
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