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Differential expression of the brassinosteroid receptor-encoding BRI1 gene in Arabidopsis

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Abstract

Brassinosteroid (BR)-regulated growth and development in Arabidopsis depends on BRASSINOSTEROID INSENSITIVE 1 (BRI1), the BR receptor that is responsible for initiating the events of BR signalling. We analysed the temporal and spatial regulation of BRI1 expression using stable transgenic lines that carried BRI1 promoter:reporter fusions. In both seedlings and mature plants the tissues undergoing elongation or differentiation showed elevated BRI1 gene activity, and it could be demonstrated that in the hypocotyl this was accompanied by accumulation of the BRI1 transcript and its receptor protein product. In seedlings the BRI1 promoter was also found to be under diurnal regulation, determined primarily by light repression and a superimposed circadian control. To determine the functional importance of transcriptional regulation we complemented the severely BR insensitive bri1-101 mutant with a BRI1-luciferase fusion construct that was driven by promoters with contrasting specificities. Whereas the BRI1 promoter-driven transgene fully restored the wild phenotype, expression from the photosynthesis-associated CAB3 and the vasculature-specific SUC2 and ATHB8 promoters resulted in plants with varying morphogenic defects. Our results reveal complex differential regulation of BRI1 expression, and suggest that by influencing the distribution and abundance of the receptor this regulation can enhance or attenuate BR signalling.

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Abbreviations

BR:

Brassinosteroid

BL:

Brassinolide

CS:

Castasterone

DD:

Continuous dark

LD:

Light–dark cycles

LL:

Continuous light

DAG:

Days after germination

LUC:

Firefly luciferase

GUS:

β-Glucuronidase

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Acknowledgments

This work was supported by the Hungarian Scientific Research Fund (Grant T 68201) and the ‘BRAVISSIMO’ Marie Curie Initial Training Grant of the European Union. The authors thank Márta Börcsök S. and Mária Tóth S. for their help with preparing the photographic material.

Author information

Correspondence to Miklos Szekeres.

Additional information

L. Hategan and B. Godza contributed equally to this work.

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Hategan, L., Godza, B., Kozma-Bognar, L. et al. Differential expression of the brassinosteroid receptor-encoding BRI1 gene in Arabidopsis . Planta 239, 989–1001 (2014). https://doi.org/10.1007/s00425-014-2031-4

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Keywords

  • Ectopic expression
  • Hormone susceptibility
  • Phytohormone
  • Reporter gene