%0 Journal Article
%T Effect of light intensity on partitioning of photosynthetic electron transport to photorespiration in four subtropical forest plants
%A LIN Zhifang PENG Changlian
%A SUN Zijian
%A LIN Guizhu
%A <br>林植芳
%A 彭长连
%A 孙梓建
%A 林桂珠
%J 中国科学C辑(英文版)
%D 2000
%I Springer
%X Photosynthetic rate (Pn) and the partitioning of noncyclic photosynthetic electron transport to photorespiration (Jo) in seedlings of four subtropical woody plants growing at three light intensities were studied in the summer time by measurements of chlorophyll fluorescence and CO2 exchange. Except Schima superba, an upper canopy tree species, the tree species Castanopsis fissa and two understory shrubs Psychotria rubra, Ardisia quinquegona had the highest Pn at 36% of sunlight intensity. The total photosynthetic electron transport rate (JF) and the ratio of Jo/JF were elevated in leaves under full sunlight. Jo/JF ratio reached 0.5-0.6 and coincided with the increasing of oxygenation rate of Rubisco (Vo), the activity of glycolate oxidase and photorespiration rate at full sunlight. It is suggested that an increasing partitioning proportion of photosynthetic electron transport to photorespiration might be one of the protective regulation mechanisms in forest plant under strong summer light and high temperature conditions.
%K subtropical forest plants
%K photosynthetic electron transport
%K photorespiration
%K glycolate oxidase
%K ratio of oxygenation rate to carboxylation rate of Rubisco<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=180CF3A72E750F3261A8A60EDC957784&aid=F74D4291C1BF6117&yid=9806D0D4EAA9BED3&vid=BE33CC7147FEFCA4&iid=E158A972A605785F&sid=15251AE9C02726D3&eid=0954045FA0C6885F&journal_id=1674-7305&journal_name=ScienceChina.Lifesciences&referenced_num=1&reference_num=15