Brassinosteroids: Physiology and Stress Management in Plants

Sirhindi, Geetika; Kumar, Manish; Kumar, Sandeep; Bhardwaj, Renu

doi:10.1002/9783527694570.ch14

Cited by 6 publications

(4 citation statements)

References 190 publications

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“…BRs constitute a group of novel steroidal phytohormones that regulate plant growth and development by manifesting an array of physiological and morphological changes [ 1 , 121 ]. They are also identified in alleviating various abiotic stresses including drought, salinity, and heat stresses, and also play an important role in biotic stress response [ 122 ]. Microarray examination of BR-deficient Arabidopsis plants revealed strong expression of thioredoxin and monodehydroascorbate reductase and lower expression of COR78 while BR-treated plant showed strong induction of COR47 indicating that BR-regulating genes are involved in regulation of cold and drought tolerance [ 123 ].…”

Section: Phytohormones and Regulation Of Drought Responsive Genesmentioning

confidence: 99%

A Functional Genomic Perspective on Drought Signalling and its Crosstalk with Phytohormone-mediated Signalling Pathways in Plants

et al. 2017

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Introduction:Drought stress is one of the most important abiotic stresses that negatively influence crop performance and productivity. Plants acclimatize to drought stress conditions through altered molecular, biochemical and physiological responses. Gene and/or protein expression and regulation are thought to be modulated upon stress perception and signal transduction for providing requisite endurance to plants.Plant growth regulators or phytohormones are important molecules required for various biological processes in plants and are also central to stress signalling pathways. Among various phytohormones, Abscisic Acid (ABA) and Ethylene (ET) are considered to be the most vital growth regulators implicated in drought stress signalling and tolerance. Besides the above two known classical phytohormones, Salicylic Acid (SA) and Jasmonic Acid (JA) have also been found to potentially enhance abiotic stress tolerance particularly that of drought, salinity, and heat stress tolerance in plants. Apart from these several other growth regulators such as Cytokinins (CKs), Auxin (AUX), Gibberellic Acid (GA), Brassinosteroids (BRs) and Strigolactones (SLs) have also been reported to actively participate in abiotic stress responses and tolerance in plants. The abiotic stress signalling in plants regulated by these hormones further depends upon the nature, intensity, and duration of exposure to various environmental stresses. It has been reported that all these phytohormones are also involved in extensive crosstalk and signal transduction among themselves and/or with other factors.Conclusion: This review thus summarizes the molecular mechanism of drought signalling and its crosstalk with various phytohormone signalling pathways implicated in abiotic stress response and tolerance.

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Section: Phytohormones and Regulation Of Drought Responsive Genesmentioning

confidence: 99%

A Functional Genomic Perspective on Drought Signalling and its Crosstalk with Phytohormone-mediated Signalling Pathways in Plants

et al. 2017

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“…Analysis of DEGs predicted to encode enzymes involved in hormone biosynthesis (abscisic acid, auxin, brassinosteroids, jasmonic acid, salicylic acid, gibberellins, and ethylene) showed that in the IP Δ velA -WT comparison, all hormone biosynthetic genes were either down-regulated or not differentially expressed ( Table S11 ), but in the seedling comparisons, they were mostly up-regulated ( Table S11 ). One of these hormones is brassinosteroid (BR) which increases plant resistance to biotic and abiotic stresses [ 42 , 43 ]. With higher concentrations of BRs, ROS production is increased, and this increases plant defence against pathogens.…”

Section: Resultsmentioning

confidence: 99%

Comparative Transcriptomics Profiling of Perennial Ryegrass Infected with Wild Type or a ΔvelA Epichloë festucae Mutant Reveals Host Processes Underlying Mutualistic versus Antagonistic Interactions

Rahnama

Maclean

Fleetwood³

et al. 2023

JoF

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Epichloë species form bioprotective endophytic symbioses with many cool-season grasses, including agriculturally important forage grasses. Despite its importance, relatively little is known about the molecular details of the interaction and the regulatory genes involved. VelA is a key global regulator in fungal secondary metabolism and development. In previous studies, we showed the requirement of velA for E. festucae to form a mutualistic interaction with Lolium perenne. We showed that VelA regulates the expression of genes encoding proteins involved in membrane transport, fungal cell wall biosynthesis, host cell wall degradation, and secondary metabolism, along with several small-secreted proteins in Epichloë festucae. Here, by a comparative transcriptomics analysis on perennial ryegrass seedlings and mature plants, which are endophyte free or infected with wild type (mutualistic interaction) or mutant ΔvelA E. festucae (antagonistic or incompatible interaction), regulatory effects of the endophytic interaction on perennial ryegrass development was studied. We show that ΔvelA mutant associations influence the expression of genes involved in primary metabolism, secondary metabolism, and response to biotic and abiotic stresses compared with wild type associations, providing an insight into processes defining mutualistic versus antagonistic interactions.

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“…showed that in the IP ∆velA-WT comparison all hormone biosynthetic genes were either down-regulated or not differentially expressed (Table S11) but in the seedling comparisons they were mostly up-regulated (Table S11). One of these hormones is brassinosteroid (BR) which increases plant resistance to biotic and abiotic stresses [42,43]. With higher concentrations of BRs, ROS production is increased, and this increases plant defence against pathogens.…”

Section: Infecting Ryegrass With ∆Vela E Festucae Mutant Alters the E...mentioning

confidence: 99%

Comparative Transcriptomics Profiling of Perennial Ryegrass Infected with Wild Type or a <em>∆velA Epichloë Festucae</em> Mutant Reveals Host Processes Underlying Mutualistic versus Antagonistic Interactions

Rahnama¹,

MacLean²,

Fleetwood³

et al. 2022

Preprint

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Epichloë species form bioprotective endophytic symbioses with many cool-season grasses, including agriculturally important forage grasses. Despite its importance, relatively little is known about the molecular details of the interaction and the regulatory genes involved. VelA is a key global regulator in fungal secondary metabolism and development. In previous studies, we showed the requirement of velA for E. festucae to form a mutualistic interaction with Lolium perenne. We showed that VelA regulates the expression of genes encoding proteins involved in membrane transport, fungal cell wall biosynthesis, host cell wall degradation and secondary metabolism, along with several small-secreted proteins in Epichloë festucae. Here, by a comparative transcriptomics analysis on perennial ryegrass seedlings and mature plants, which are endophyte free or infected with wild type (mutualistic interaction) or mutant ∆velA E. festucae (antagonistic or incompatible interaction), regulatory effects of the endophytic interaction on perennial ryegrass development was studied. We show that ∆velA mutant associations influence the expression of genes involved in primary metabolism, secondary metabolism and response to biotic and abiotic stresses compared to wild type associations, providing an insight into processes defining mutualistic versus antagonistic interactions.

show abstract

Brassinosteroids: Physiology and Stress Management in Plants

Cited by 6 publications

References 190 publications

A Functional Genomic Perspective on Drought Signalling and its Crosstalk with Phytohormone-mediated Signalling Pathways in Plants

A Functional Genomic Perspective on Drought Signalling and its Crosstalk with Phytohormone-mediated Signalling Pathways in Plants

Comparative Transcriptomics Profiling of Perennial Ryegrass Infected with Wild Type or a ΔvelA Epichloë festucae Mutant Reveals Host Processes Underlying Mutualistic versus Antagonistic Interactions

Comparative Transcriptomics Profiling of Perennial Ryegrass Infected with Wild Type or a <em>∆velA Epichloë Festucae</em> Mutant Reveals Host Processes Underlying Mutualistic versus Antagonistic Interactions

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