BRANCHED1 Promotes Axillary Bud Dormancy in Response to Shade in Arabidopsis

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors is: Pilar Cubas

Eduardo González-Grandío; César Poza-Carrión; Carlos Oscar S. Sorzano; Pilar Cubas

2013

Scholarcy highlights

  • Plants obtain their energy from light by converting photons into chemical energy through photosynthesis
  • To investigate whether BRC1 and BRC2 have a relevant role during shade avoidance syndrome, we grew wild-type plants in long days under W until flowering, when axillary meristems begin to initiate in long days
  • We counted primary rosette branches and found that wild-type plants grown in W+FR had 3 times fewer branches than plants grown in W, indicating that exposure of plants with young buds to a low R:FR ratio promotes bud arrest in Arabidopsis
  • As many genes responding to changes in light quality have daily oscillating mRNA levels and some SAS responses are coupled to the circadian clock, we investigated whether BRC1 and BRC2 were regulated in a circadian-dependent manner
  • We studied this response in adult plants grown in W and exposed transiently to a shade simulated with W+FR
  • We monitored the transcriptional changes taking place in axillary buds and found that BRC1 mRNA accumulated shortly after exposure to shade. These results are in contrast with those of Finlayson et al, who reported that BRC1 expression was unaffected in plants constitutively grown in low R:FR, while BRC2 expression was upregulated in these conditions
  • BRC1 activity is linked to the negative regulation of cell cycle and ribosome gene expression and to the promotion of abscisic acid signaling, all of which are responses accompanying bud dormancy in a wide range of species

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