Mol. Cells 2012; 34(4): 367-374
Published online September 6, 2012
https://doi.org/10.1007/s10059-012-0111-5
© The Korean Society for Molecular and Cellular Biology
Correspondence to : *Correspondence: hanyuzhen@cau.edu.cn
Leaf senescence is the final stage of leaf life history, and it can be regulated by multiple internal and external cues. La-related proteins (LARPs), which contain a well-con-served La motif (LAM) domain and normally a canonical RNA recognition motif (RRM) or noncanonical RRM-like motif, are widely present in eukaryotes. Six LARP genes (LARP1a-1c and LARP6a-6c) are present in Arabidopsis, but their biological functions have not been studied previously. In this study, we investigated the biological roles of LARP1c from the LARP1 family. Constitutive or inducible overexpression of LARP1c caused premature leaf senescence. Expression levels of several senes-cence-asso-ciated genes and defense-related genes were elevated upon overexpression of LARP1c. The LARP1c null mutant 1c-1 impaired ABA-, SA-, and MeJA-induced leaf senescence in detached leaves. Gene expression profiles of LARP1c showed age-dependent expression in rosette leaves. Taken together, our results suggest LARP1c is involved in regulation of leaf senescence.
Keywords Arabidopsis, LARP1c, senescence, senescence-associated genes
Mol. Cells 2012; 34(4): 367-374
Published online October 31, 2012 https://doi.org/10.1007/s10059-012-0111-5
Copyright © The Korean Society for Molecular and Cellular Biology.
Bangyue Zhang, Jianheng Jia, Min Yang, Chunxia Yan, and Yuzhen Han*
State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China
Correspondence to:*Correspondence: hanyuzhen@cau.edu.cn
Leaf senescence is the final stage of leaf life history, and it can be regulated by multiple internal and external cues. La-related proteins (LARPs), which contain a well-con-served La motif (LAM) domain and normally a canonical RNA recognition motif (RRM) or noncanonical RRM-like motif, are widely present in eukaryotes. Six LARP genes (LARP1a-1c and LARP6a-6c) are present in Arabidopsis, but their biological functions have not been studied previously. In this study, we investigated the biological roles of LARP1c from the LARP1 family. Constitutive or inducible overexpression of LARP1c caused premature leaf senescence. Expression levels of several senes-cence-asso-ciated genes and defense-related genes were elevated upon overexpression of LARP1c. The LARP1c null mutant 1c-1 impaired ABA-, SA-, and MeJA-induced leaf senescence in detached leaves. Gene expression profiles of LARP1c showed age-dependent expression in rosette leaves. Taken together, our results suggest LARP1c is involved in regulation of leaf senescence.
Keywords: Arabidopsis, LARP1c, senescence, senescence-associated genes
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