Brassinosteroid signalling

Abstract

SummaryThe brassinosteroid (BR) class of steroid hormones regulates plant development and physiology. The BR signal is transduced by a receptor kinase-mediated signal transduction pathway, which is distinct from animal steroid signalling systems. Recent studies have fully connected the BR signal transduction chain and have identified thousands of BR target genes, linking BR signalling to numerous cellular processes. Molecular links between BR and several other signalling pathways have also been identified. Here, we provide an overview of the highly integrated BR signalling network and explain how this steroid hormone functions as a master regulator of plant growth, development and metabolism.

Transcriptomic Analysis of Brassinosteroid Biosynthesis and Signaling Pathway Genes in Healthy and Malformed Tissues of Mango Variety Amrapalli

“…Brassinosteroids are mainly synthesized in pollens resulting in more number of brassinosteroids biosynthesis genes in malformed tissues when compared to healthy tissues. Similar reports were also made in other crops by several workers (Yasuta et al, 1995;Zullo et al, 2002;Zhu et al, 2013).…”

9-Lipoxygenase-derived oxylipins activate brassinosteroid signaling to promote cell wall-based defense and limit pathogen infection

“…We observed the induction of GUS activity in DWF4:GUS seedlings and BKI1:YFP mobilization in young growing tissues (Fig. 2), in which BR might regulate plant growth (Zhu et al, 2013). This local BR pathway induction might explain our results for BZR1 and BZR2/BES1 activation, which showed no change in BZR1 and BZR2/BES1 phosphorylation when total protein extracts from 9-HOT-or 9-KOT-treated seedlings were examined, whereas simultaneous Figure 5.…”

Identification and characterization of the BZR transcription factor family and its expression in response to abiotic stresses in Zea mays L.

“…BR perception and signal transduction involve a signaling cascade that transduces the BR signal from the cell surface to transcriptional activation in the nucleus (Kir et al 2015). BZR1 transcription factor plays a key role in the downstream BR signaling pathway, by activating thousands of genes and repressing similar number of genes including BR biosynthetic genes via a feedback loop (Zhu et al 2013). Considering that BRs are unable to be transported long distance, it has been proposed that BZR1 transcription factors may also serve as major connecting points among other signaling pathways (Saini et al 2015).…”

“…They regulate multiple physiological functions including seed germination, cell elongation and division, senescence, vascular-differentiation, reproduction, root development, photomorphogenesis and respond to various biotic and abiotic stresses (Saini et al 2015;Singh and SavaldiGoldstein 2015). Molecular studies evidenced cross-talk between BRs and other phytohormones and hypothesised the existence of synergistic effects between exogenous BR treatments and endogenous levels of other hormones (Gruszka 2013;Zhu et al 2013). Extensive research over the years has led to the idea that BRs could act as stressimpact-mitigating compounds in different plants exposed to various abiotic stresses such as high temperature, low temperature in terms of chilling and freezing, salinity, light, drought, metals/metalloids and organic pollutants (Derevyanchuk et al 2016;Vardhini and Anjum 2015 and references therein).…”