FRUITFULL controls SAUR10 expression and regulates Arabidopsis growth and architecture

• Published in: Journal of experimental botany 2017-06, Vol.68 (13), p.3391-3403
• Main Authors: Bemer, Marian, van Mourik, Hilda, Muiño, Jose M., Ferrándiz, Cristina, Kaufmann, Kerstin, Angenent, Gerco C.
• Format: Article
• Language: English
• Subjects: Arabidopsis - genetics; Arabidopsis - growth & development; Arabidopsis - metabolism; Arabidopsis Proteins - genetics; Arabidopsis Proteins - metabolism; BIOS Plant Development Systems; EPS; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; Growth and Development; Laboratorium voor Moleculaire biologie; Laboratory of Molecular Biology; MADS Domain Proteins - genetics; MADS Domain Proteins - metabolism; Plant Stems - genetics; Plant Stems - growth & development; PRI BIOS Plant Development Systems; Research Papers
• ISSN: 0022-0957; 1460-2431
• DOI: 10.1093/jxb/erx184

MADS-domain transcription factors are well known for their roles in plant development and regulate sets of downstream genes that have been uncovered by high-throughput analyses. A considerable number of these targets are predicted to function in hormone responses or responses to environmental stimuli, suggesting that there is a close link between developmental and environmental regulators of plant growth and development. Here, we show that the Arabidopsis MADS-domain factor FRUITFULL (FUL) executes several functions in addition to its noted role in fruit development. Among the direct targets of FUL, we identified SMALL AUXIN UPREGULATED RNA 10 (SAUR10), a growth regulator that is highly induced by a combination of auxin and brassinosteroids and in response to reduced R:FR light. Interestingly, we discovered that SAUR10 is repressed by FUL in stems and inflorescence branches. SAUR10 is specifically expressed at the abaxial side of these branches and this localized activity is influenced by hormones, light conditions and by FUL, which has an effect on branch angle. Furthermore, we identified a number of other genes involved in hormone pathways and light signalling as direct targets of FUL in the stem, demonstrating a connection between developmentally and environmentally regulated growth programs.