Auxin and gibberellin responsive Arabidopsis SMALL AUXIN UP RNA36 regulates hypocotyl elongation in the light

KEY MESSAGE : The Arabidopsis SAUR36 , renamed RAG1 , integrates auxin and gibberellin signals to regulate apical hook maintenance in etiolated seedlings, hypocotyl elongation in the light and fertility. Phytohormone signalling intermediates integrate responses to developmental cues and the variety...

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Veröffentlicht in:	Plant cell reports Jg. 32; H. 6; S. 759 - 769
Hauptverfasser:	Stamm, Petra, Kumar, Prakash P
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Berlin/Heidelberg Springer-Verlag 01.06.2013 Springer Nature B.V
Schlagworte:	abscisic acid Abscisic Acid - pharmacology Arabidopsis Arabidopsis - genetics Arabidopsis - growth & development Arabidopsis - physiology Arabidopsis Proteins Arabidopsis Proteins - genetics Arabidopsis Proteins - metabolism auxins Biomedical and Life Sciences Biotechnology Cell Biology Darkness Developmental stages Fertility Gene Expression Gene Expression Regulation, Plant Gene Knockdown Techniques Gene Knockout Techniques genes genetics Germination gibberellins Gibberellins - pharmacology growth & development Hypocotyl Hypocotyl - genetics Hypocotyl - growth & development Hypocotyl - physiology hypocotyls Indoleacetic Acids Indoleacetic Acids - pharmacology Life Sciences Light mature plants metabolism Organ Specificity Original Paper pharmacology Phenotype Phylogeny physiology Plant Biochemistry Plant growth Plant Growth Regulators Plant Growth Regulators - pharmacology Plant Sciences Plants, Genetically Modified RNA Seed germination Seedlings Seedlings - genetics Seedlings - growth & development Seedlings - physiology Seeds Seeds - genetics Seeds - growth & development Seeds - physiology Signal Transduction Transgenic plants SAUR36 Phytohormone crosstalk Auxins Hypocotyl elongation Apical hook Gibberellins
ISSN:	0721-7714, 1432-203X, 1432-203X
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Zusammenfassung:	KEY MESSAGE : The Arabidopsis SAUR36 , renamed RAG1 , integrates auxin and gibberellin signals to regulate apical hook maintenance in etiolated seedlings, hypocotyl elongation in the light and fertility. Phytohormone signalling intermediates integrate responses to developmental cues and the variety of environmental inputs thereby governing all aspects of plant growth and development. At the genetic level, interactions of different phytohormone signalling pathways lead to the regulation of overlapping sets of target genes. We have characterised SMALL AUXIN UP RNA 36 (SAUR36, At2g45210) whose expression is induced by auxins and repressed by gibberellins. Its expression appears to be restricted to elongating tissues. Germination responses to treatments with paclobutrazol and exogenous abscisic acid were affected in knock-out, knock-down as well as ectopic expression lines. At later stages of development, however, transgenic plants with reduced levels of SAUR36 expression appeared similar to wild-type plants, while ectopic expression of SAUR36 led to the absence of apical hooks in etiolated seedlings and longer hypocotyls in light-grown seedlings. Mature plants ectopically expressing SAUR36 further displayed strongly reduced fertility and wavy growth of inflorescence axes, the latter of which could be linked to defects in auxin transport. Taken together, our data suggest that SAUR36 plays a role in the regulation of seed germination by gibberellins and abscisic acid, light-dependent hypocotyl elongation as well as apical hook formation or maintenance. Therefore, we propose that it could act as one of the converging points of auxin and gibberellin signal integration in controlling key plant developmental events. Hence, we named the gene RESPONSE TO AUXINS AND GIBBERELLINS 1 (RAG1).
Bibliographie:	http://dx.doi.org/10.1007/s00299-013-1406-5 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0721-7714 1432-203X 1432-203X
DOI:	10.1007/s00299-013-1406-5