Modes of Brassinosteroid Activity in Cold Stress Tolerance

Ramirez, Veronica; Poppenberger, Brigitte

doi:10.3389/fpls.2020.583666

Cited by 26 publications

(17 citation statements)

References 130 publications

(183 reference statements)

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“…The presence of ROS induces a cyclic electron flow, non-photochemical quenching (NPQ), accumulation of photoprotective proteins, and increased activity of several antioxidant enzymes, thus inducing photoprotection under low temperatures [30]. Furthermore, the BR-induced production of antioxidant enzymes aid in maintaining the ROS homeostasis and induces stress tolerance following cold stress [23,185]. The exogenous application of BRs leads to enhanced antioxidant capacity, orchestrating the alleviation of ROS burst-induced oxidative damage [186].…”

Section: Role Of Brs During Low Temperaturesmentioning

confidence: 99%

Role of Reactive Oxygen Species and Hormones in Plant Responses to Temperature Changes

Devireddy

Tschaplinski

Tuskan

et al. 2021

IJMS

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Temperature stress is one of the major abiotic stresses that adversely affect agricultural productivity worldwide. Temperatures beyond a plant’s physiological optimum can trigger significant physiological and biochemical perturbations, reducing plant growth and tolerance to stress. Improving a plant’s tolerance to these temperature fluctuations requires a deep understanding of its responses to environmental change. To adapt to temperature fluctuations, plants tailor their acclimatory signal transduction events, and specifically, cellular redox state, that are governed by plant hormones, reactive oxygen species (ROS) regulatory systems, and other molecular components. The role of ROS in plants as important signaling molecules during stress acclimation has recently been established. Here, hormone-triggered ROS produced by NADPH oxidases, feedback regulation, and integrated signaling events during temperature stress activate stress-response pathways and induce acclimation or defense mechanisms. At the other extreme, excess ROS accumulation, following temperature-induced oxidative stress, can have negative consequences on plant growth and stress acclimation. The excessive ROS is regulated by the ROS scavenging system, which subsequently promotes plant tolerance. All these signaling events, including crosstalk between hormones and ROS, modify the plant’s transcriptomic, metabolomic, and biochemical states and promote plant acclimation, tolerance, and survival. Here, we provide a comprehensive review of the ROS, hormones, and their joint role in shaping a plant’s responses to high and low temperatures, and we conclude by outlining hormone/ROS-regulated plant responsive strategies for developing stress-tolerant crops to combat temperature changes.

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Section: Role Of Brs During Low Temperaturesmentioning

confidence: 99%

Role of Reactive Oxygen Species and Hormones in Plant Responses to Temperature Changes

Devireddy

Tschaplinski

Tuskan

et al. 2021

IJMS

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“…pCREs similar to binding sites for BZR1 (rank 1 to 4), WRKY24 (rank seven to eight), and WRKY 30 (rank seven) were also among the most predictive cold-CREs in cold-TFBM models ( S4 fig ). These TFs are known for cold signal transduction and cold stress tolerance via CBF-independent pathways (Park et al, 2015; Ramirez and Poppenberger, 2020). BZR1 is known to be involved in cold stress tolerance through processes such as ROS scavenging (Ramirez and Poppenberger, 2020) and facilitating structural changes in cell membranes and cell walls (Benatti et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…These TFs are known for cold signal transduction and cold stress tolerance via CBF-independent pathways (Park et al, 2015;Ramirez and Poppenberger, 2020). BZR1 is known to be involved in cold stress tolerance through processes such as ROS scavenging (Ramirez and Poppenberger, 2020) and facilitating structural changes in cell membranes and cell walls (Benatti et al, 2012). Moreover, WRKY TFs are also known to be involved in phytohormonal-induced signal transduction for low-temperature tolerance in plants (Park et al, 2018(Park et al, , 2015.…”

Section: Datasets (S3 Table) In Addition We Collected 35 Knownmentioning

confidence: 99%

Temporal Regulation of Cold Transcriptional Response in Switchgrass

Ranaweera

Brown

Wang

et al. 2022

Preprint

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Switchgrass low-land ecotypes have significantly higher biomass but lower cold tolerance compared to up-land ecotypes. Understanding the molecular mechanisms underlying cold response, including the ones at transcriptional level, can contribute to improving tolerance of high-yield switchgrass under chilling and freezing environmental conditions. Here, by analyzing an existing switchgrass transcriptome dataset, the temporal cis-regulatory basis of switchgrass transcriptional response to cold is dissected computationally. We found that the number of cold-responsive genes and enriched Gene Ontology terms increased as duration of cold treatment increased from 30 min to 24 hours, suggesting an amplified response/cascading effect in cold-responsive gene expression. To identify genomic sequences likely important for regulating cold response, machine learning models predictive of cold response were established using k-mer sequences enriched in the genic and flanking regions of cold-responsive genes but not non-responsive genes. These k-mers, referred to as putative cis-regulatory elements (pCREs) are likely regulatory sequences of cold response in switchgrass. There are in total 655 pCREs where 54 are important in all cold treatment time points. Consistent with this, eight of 35 known cold-responsive CREs were similar to top-ranked pCREs in the models and only these eight were important for predicting temporal cold response. More importantly, most of the top-ranked pCREs were novel sequences in cold regulation. Our findings suggest additional sequence elements important for cold-responsive regulation previously not known that warrant further studies.

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“…In Arabidopsis CES can increase freezing stress tolerance when over-expressed and this is due to its ability to induce the C-repeat/DRE-Binding Factors (CBFs), but also non-CBF pathways (Eremina et al, 2016) implicated in cold tolerance. Since tomato is a chilling-sensitive plant and has hardly any capacity to cold acclimate (Zhang et al, 2004), it was of interest to test if SlCES may be able to impact pathways that confer tolerance also to chilling conditions, which cause damage by different means (Ramirez and Poppenberger, 2020). To investigate this, wild-type and the SlCESoe-9 and SlCESoe-44 lines were first grown at normal ambient temperatures of 25 ± 3 • C. This showed that SlCES over-expression did not induce obvious morphological defects.…”

Section: Slces Over-expression Improves Growth and Fruit Set At Low A...mentioning

confidence: 99%

“…Brassinosteroids (BRs) are steroid hormones that control many different aspects of plant growth and development, with concentration-and organ-specific effects (Fridman and Savaldi-Goldstein, 2013). In addition, they also take part in adaptive growth processes and in both abiotic and biotic stress responses (Nolan et al, 2020;Ramirez and Poppenberger, 2020). BRs act in concert with other plant hormones and in particular cross-talk with the gibberellins (GAs), has received a considerable amount of research attention in the past few years.…”

Section: Introductionmentioning

confidence: 99%

SlCESTA Is a Brassinosteroid-Regulated bHLH Transcription Factor of Tomato That Promotes Chilling Tolerance and Fruit Growth When Over-Expressed

et al. 2022

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Brassinosteroids (BRs) are required for various aspects of plant growth and development, but also participate in stress responses. The hormones convey their activity through transcriptional regulation and posttranslational modification of transcription factors and one class are basic helix-loop-helix (bHLH) proteins of the BR Enhanced Expression (BEE) subfamily, which in Arabidopsis thaliana include BEE1-3 and CESTA (CES). CES and the BEEs promote the expression of different BR-responsive genes, including genes encoding gibberellin (GA) biosynthetic and catabolizing enzymes, as well as cold-responsive genes. Interestingly, in terms of an application, CES could promote both fruit growth and cold stress tolerance when over-expressed in A. thaliana and here it was investigated, if this function is conserved in the fruit crop Solanum lycopersicum (cultivated tomato). Based on amino acid sequence similarity and the presence of regulatory motifs, a CES orthologue of S. lycopersicum, SlCES, was identified and the effects of its over-expression were analysed in tomato. This showed that SlCES, like AtCES, was re-localized to nuclear bodies in response to BR signaling activation and that it effected GA homeostasis, with related phenotypes, when over-expressed. In addition, over-expression lines showed an increased chilling tolerance and had altered fruit characteristics. The possibilities and potential limitations of a gain of SlCES function as a breeding strategy for tomato are discussed.

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Modes of Brassinosteroid Activity in Cold Stress Tolerance

Cited by 26 publications

References 130 publications

Role of Reactive Oxygen Species and Hormones in Plant Responses to Temperature Changes

Role of Reactive Oxygen Species and Hormones in Plant Responses to Temperature Changes

Temporal Regulation of Cold Transcriptional Response in Switchgrass

SlCESTA Is a Brassinosteroid-Regulated bHLH Transcription Factor of Tomato That Promotes Chilling Tolerance and Fruit Growth When Over-Expressed

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