ABA-responsive RNA-binding proteins are involved in chloroplast and stromule function in Arabidopsis seedlings.

Planta
Sabine RaabStefan Hoth

Abstract

The phytohormone abscisic acid (ABA) regulates essential growth and developmental processes in plants. Recently, RNA-binding proteins have been described as components of ABA signaling during germination. We have identified ten ABA-regulated RNA-binding proteins in Arabidopsis seedlings. Among those genes, AtCSP41B and cpRNP29 are highly expressed in seedlings. Using promoter:reporter gene analyses, we showed that both AtCSP41B and cpRNP29 were in particular expressed in photosynthetically active organs like green cotyledons, leaves, and petioles. The analysis of CFP-fusion proteins demonstrates that cpRNP29 localized to chloroplasts and AtCSP41B to chloroplasts and stromules. Whereas RNA-binding of cpRNP29 has previously been shown, we demonstrated through in vitro RNA-binding assays that recombinant AtCSP41B binds to RNA, and that chloroplast petD RNA can serve as a target of AtCSP41B. Developmental or environmental stimuli affected the expression of AtCSP41B and cpRNP29 in seedlings. Both genes were repressed during senescence, but only AtCSP41B was significantly repressed upon water stress. In addition, AtCSP41B and cpRNP29 exhibited low expression in etiolated seedlings compared to green seedlings, and cpRNP29 was regulate...Continue Reading

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Citations

Feb 14, 2009·Molecules and Cells·Mi-Ok LeeChoo Bong Hong
Mar 20, 2009·Proceedings of the National Academy of Sciences of the United States of America·Michael TillichChristian Schmitz-Linneweber
Jan 23, 2016·Acta Biochimica Et Biophysica Sinica·Pingan HanXiaoyu Zhang
Feb 19, 2011·Journal of Plant Physiology·Hannes RuweChristian Schmitz-Linneweber
Nov 29, 2011·Plant Science : an International Journal of Experimental Plant Biology·Alfredo AmbrosoneStefania Grillo
Mar 25, 2009·The Plant Journal : for Cell and Molecular Biology·Sabine RaabStefan Hoth
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Jan 22, 2010·Physiologia Plantarum·Ryuuichi D ItohMakoto T Fujiwara
Mar 21, 2020·Plants·Marlene TeubnerChristian Schmitz-Linneweber

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