TITLE	Sensitivity of response to abscisic acid affects the power of self-thinning in Arabidopsis thaliana
AUTHOR	Hao ZHANG State Key Laboratory of Plant Physiology & Biochemical, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310029, P. R. China Gen-Xuan WANG* State Key Laboratory of Plant Physiology & Biochemical, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310029, P. R. China Zhi-Qiang LIU State Key Laboratory of Plant Physiology & Biochemical, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310029, P. R. China Zhu-Xia SHEN State Key Laboratory of Plant Physiology & Biochemical, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310029, P. R. China Xing-Zheng ZHAO State Key Laboratory of Plant Physiology & Biochemical, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310029, P. R. China
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ABSTRACT	The effect of sensitivity of abscisic acid (ABA) on the power of self-thinning was studied with two Arabidopsis mutants (abi1-1, insensitive to ABA and era1-2 hypersensitive to ABA). The experimental results showed that the self-thinning power of abi1-1 (-1.49) was smaller than that of wild type (-1.35), and the self-thinning power of era1-2 (-1.21) was greater than that of wild type. Two parameters of resource utilization (l mean height from root to leaf; a total area of leaves) were more advantageous to era1-2 than to abi1-1 under density stress. Physiological indices of light use (photosynthetic rate, photosynthesis index PSI), water loss (transpiration rate, stomata area index SAI), and water-use efficiency (photosynthetic rate/ transpiration rate) of abi1-1 and era1-2 were consistent with the resource utilization parameters of these Arabidopsis mutants. It can be concluded that the different self-thinning power of the two Arabidopsis mutants resulted from their different resource utilization (such as light and water use) in response to density stress.
KEYWORD	Abscisic acid; Arabidopsis thaliana; Phytohormones; Resource utilization; Self-thinning;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 46 Number 4 October 2005, page 347-353, 7 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China