Overexpression of a LAM domain containing RNA-binding protein LARP1c induces precocious leaf senescence in Arabidopsis.

Leaf senescence is the final stage of leaf life history, and it can be regulated by multiple internal and external cues. La-related proteins which contain a well-conserved La motif (LAM) domain and normally a canonical RNA recognition motif (RRM) or noncanonical RRM-like motif, are widely present in eukaryotes. Six genes and are present in Arabidopsis, but their biological functions have not been studied previously. In this study, we investigated the biological roles of from the family. Constitutive or inducible overexpression of Lduanyu371c caused premature leaf senescence. Expression levels of several senescence-associated genes and defense-related genes were elevated upon overexpression of The Lduanyu371c null mutant 1c-1 impaired ABA-, SA-, and MeJA-induced leaf senescence in detached leaves. Gene expression profiles of Lduanyu371c showed age-dependent expression in rosette leaves. Taken together, our results suggest Lduanyu371c is involved in regulation of leaf senescence.

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