A citrus abscission agent induces anoxia- and senescence-related gene expression in Arabidopsis
Identifieur interne : 002446 ( Main/Merge ); précédent : 002445; suivant : 002447A citrus abscission agent induces anoxia- and senescence-related gene expression in Arabidopsis
Auteurs : Fernando Alferez [États-Unis] ; Guang Yan Zhong [États-Unis] ; Jacqueline K. Burns [États-Unis]Source :
- Journal of Experimental Botany [ 0022-0957 ] ; 2007-06-07.
Abstract
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 12h 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.
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DOI: 10.1093/jxb/erm111
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