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JXB Advance Access published online on June 7, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm111
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

A citrus abscission agent induces anoxia- and senescence-related gene expression in Arabidopsis

Fernando Alferez, Guang Yan Zhong * and Jacqueline K. Burns{dagger}

Horticultural Sciences Department, University of Florida, IFAS, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850, USA

{dagger} To whom correspondence should be addressed. E-mail: jkbu{at}ufl.edu

The mechanisms of negative effects of 5-chloro-3-methyl-4-nitro-1H-pyrazole (CMNP), a pyrazole-derived plant growth regulator used as a citrus abscission agent, were explored in Arabidopsis by integrating transcriptomic, physiological, and ultrastructural analyses. CMNP promoted starch degradation and senescence-related symptoms, such as chloroplast membrane disruption, electrolyte leakage, and decreased chlorophyll and protein content. Symptoms of plant decline were evident 12 h after CMNP treatment. Microarray analysis revealed that CMNP influenced genes associated with stress, including those related to anoxia, senescence, and detoxification. Sucrose treatment arrested CMNP-induced plant decline. The results demonstrate that the plant response to CMNP shares common elements with various stresses and senescence at physiological and molecular levels.

Key words: Electrolyte leakage, microarray analysis, plant decline, stress

* Present address: Citrus Research Institute, Chinese Academy of Agricultural Sciences, Citrus Village 15, Xiema Township, Beibei District, Chongqing, 400712, PR China.

Received 11 December 2006; Revised 23 March 2007 Accepted 19 April 2007


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