The Pea TCP Transcription Factor PsBRC1 Acts Downstream of Strigolactones to Control Shoot Branching

The results suggest that PsBRC1 may have a role in integrating SL and CK signals and that SLs act directly within the bud to regulate its outgrowth

Nils Braun; Alexandre de Saint Germain; Jean-Paul Pillot; St├ęphanie Boutet-Mercey; Marion Dalmais; Ioanna Antoniadi; Xin Li; Alessandra Maia-Grondard; Christine Le Signor; Nathalie Bouteiller; Da Luo; Abdelhafid Bendahmane; Colin Turnbull; Catherine Rameau

2011

Scholarcy highlights

  • The function of PsBRC1, the pea homolog of the maize TEOSINTE BRANCHED1 and the Arabidopsis BRANCHED1 genes, was investigated
  • To test whether PsBRC1 was expressed mainly in axillary buds, as shown in maize, Arabidopsis, rice, and tomato, wild-type plants were dissected into different organs/parts and PsBRC1 transcript levels were quantified by real-time PCR
  • In support of BRC1 acting in the SL pathway, we showed that PsBRC1 expression in axillary buds was rapidly enhanced by SL treatment
  • This study shows that the PsBRC1 transcription factor acts locally in the axillary bud and strongly supports that it acts downstream of SL to repress bud outgrowth
  • The degree of branching of a plant is an important component of its fitness, and it is very likely that different pathways are involved in its tight control according to bud position on the stem, developmental stage, and environmental conditions
  • It indicates that the SL signaling pathway may be shared among multiple developmental modules, as proposed by Doebley and Lukens
  • Future studies will decipher these different components of SL function

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