Fine-tuning of auxin homeostasis governs the transition from floral stem cell maintenance to gynoecium formation. Issue 1 (December 2017)

• Record Type: Journal Article
• Authors: Yamaguchi, Nobutoshi; Huang, Jiangbo; Xu, Yifeng; Tanoi, Keitaro; Ito, Toshiro
• Is Part Of: Nature communications. Volume 8:Issue 1(2017)
• Page Start: 1
• Page End: 15
• Publication Date: 2017-12
• Subjects: Biology -- Periodicals; Physical sciences -- Periodicals; 505
• DOI: 10.1038/s41467-017-01252-6
• Languages: English
• ISSNs: 2041-1723

Abstract

Abstract To ensure successful plant reproduction and crop production, the spatial and temporal control of the termination of the floral meristem must be coordinated. InArabidopsis, the timing of this termination is determined by AGAMOUS (AG). Following its termination, the floral meristem underdoes gynoecium formation. A direct target of AG, CRABS CLAW (CRC ), is involved in both floral meristem determinacy and gynoecium development. However, how floral meristem termination is coordinated with gynoecium formation is not understood. Here, we identify a mechanistic link between floral meristem termination and gynoecium development through fine-tuning of auxin homeostasis by CRC. CRC controls auxin homeostasis in the medial region of the developing gynoecium to generate proper auxin maxima. This regulation partially occurs via direct transcriptional repression ofTORNADO2 (TRN2 ) by CRC. Plasma membrane-localized TRN2 modulates auxin homeostasis. We propose a model describing how regulation of auxin homeostasis mediates the transition from floral meristem termination to gynoecium development. InArabidopsis, the timing of floral meristem termination is determined by AGAMOUS. Here, the authors show that the CRC transcription factor, itself a direct target of AGAMOUS, coordinates meristem termination with subsequent gynoecium formation partly by repressingTRN2 expression and regulating auxin homeostasis.