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Sexual differences in photosynthetic characteristics of Ginkgo during leaf senescence
Dawei Shi,Xiaodong Wei,Guoxiang Chen,Yanli Xu
College of Life Sciences,Nanjing Normal University
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Funding: 国家自然科学基金,教育部博士点基金(No.2008104GZ30027,2007611SBJ0146)
Opened online:13 January 2010
Accepted by: none
Citation: Dawei Shi,Xiaodong Wei,Guoxiang Chen.Sexual differences in photosynthetic characteristics of Ginkgo during leaf senescence[OL]. [13 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38873
 
 
Photosynthetic characteristics were compared between female and male ginkgoes, to investigate the differences in photosynthetic decline of leaves between two species during leaf senescence. Photosynthetic rate was used as a biomarker to define the initiation of leaf senescence which could be divided two stages. Therefore, the leaf senescence of ginkgo occurred at late August which could be the beginning of autumn. During the early stages of leaf senescence, photosynthetic functions, such as the electron transport activities of photosystems and photophosphorylation, and scavenging activities were lower in female than in male. But at the late senescence, these characteristics of female were higher those of male. With leaf aging, the damage to chloroplast of female induced by senescence was more than that of male. Our results found that there was a similar rate of leaf senescence between female and male, which may be the reason why the ginkgo has declined during the evolution of plant senescence.
Keywords:Ginkgo biloba;photosynthesis;leaf senescence;evolution
 
 
 

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