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Abstract
Brassinosteroids (BRs) play pivotal roles in the regulation of many dimensions of a plant’s life. Hence, through extensive efforts from many research groups, BR signaling has emerged as one of the best-characterized plant signaling pathways. The key molecular players of BR signaling from the cell surface to the nucleus important for the regulation of plant growth and development are well-established. Recent data show that BRs also modulate plant responses to environmental stresses such as drought and pathogen infection. In this mini review, we present the recent progress in BR signaling specifically in the post-translational SUMO modification of BR’s master regulators, BES1/BZR1. We also discuss recent findings on the crosstalk between BR, UV light, and jasmonic acid signaling pathways to balance growth during light stress and pathogen infections. Finally, we describe the current update on the molecular link between BR signaling and intracellular auxin transport that essential for plant development.
Highlights
Brassinosteroids (BRs) are plant steroid hormones that have a significant impact on plant growth and development, cell elongation, resistance to pathogens, and plant responses to environmental stresses
In Arabidopsis, BRs are perceived by a plasma membrane receptor, BRASSINOSTEROID INSENSITIVE1 (BRI1) leucine-rich repeat receptor-like kinase (LRR-RLK; Li and Chory, 1997; Wang et al, 2001; Kinoshita et al, 2005)
It is quite intriguing that the SUMOylation of BES1 and BRASSINAZOLE RESISTANT1 (BZR1) produces opposite outcomes, where BES is degraded while BZR1 is more stable
Summary
The key molecular players of BR signaling from the cell surface to the nucleus important for the regulation of plant growth and development are well-established. Recent data show that BRs modulate plant responses to environmental stresses such as drought and pathogen infection. In this mini review, we present the recent progress in BR signaling in the post-translational SUMO modification of BR’s master regulators, BES1/BZR1. We discuss recent findings on the crosstalk between BR, UV light, and jasmonic acid signaling pathways to balance growth during light stress and pathogen infections. We describe the current update on the molecular link between BR signaling and intracellular auxin transport that essential for plant development
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