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Physiological characteristics of the primitive CO(2) concentrating mechanism in PEPC transgenic rice.
MedLine Citation:
PMID:  21072616     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The relationship between carbon assimilation and high-level expression of the maize PEPC in PEPC transgenic rice was studied by comparison to that in the untransformed rice,japonica kitaake. Stomatal conductance and photosynthetic rates in PEPC transgenic rice were higher than those of untransformed rice, but the increase of stomatal conductance had no statistical correlation with that of photosynthetic rate. Under high levels of light intensity, the protein contents of PEPC and CA were increased significantly. Therefore the photosynthetic capacity was increased greatly (50%) with atmospheric CO(2) supply. While CO(2) release in leaf was reduced and the compensation point was lowered correspondingly under CO(2) free conditions. Treatment of the rice with the PEPC-specific inhibitor DCDP showed that overexpression of PEPC and enhancement of carbon assimilation were related to the stability of Fv/Fm. Labeling with(14)CO(2) for 20 s showed more(14)C was distributed to C(4) primary photosynthate asperate in PEPC transgenic rice, suggesting that there exists a limiting C(4) photosynthetic mechanism in leaves. These results suggest that the primitive CO(2) concentrating mechanism found in rice could be reproduced through metabolic engineering, and shed light on the physiological basis for transgenic breeding with high photosynthetic efficiency.
Authors:
Demao Jiao; Tingyun Kuang; Xia Li; Qiaoying Ge; Xueqing Huang; Naibin Hao; Kezhi Bai
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science in China. Series C, Life sciences / Chinese Academy of Sciences     Volume:  46     ISSN:  1006-9305     ISO Abbreviation:  Sci. China, C, Life Sci.     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2010-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9611809     Medline TA:  Sci China C Life Sci     Country:  China    
Other Details:
Languages:  eng     Pagination:  438-46     Citation Subset:  -    
Affiliation:
Institute of Agrobiological Genetics and Physiology, Jiangsu Academy of Agricultural sciences, 210014, Nanjing, China, photosyn@public1.ptt.js.cn.
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