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Special Issue "Plant Hormones Brassinosteroids and Its Actions in Plants"

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Plant Sciences".

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editor

Dr. Jana Oklestkova
E-Mail Website
Guest Editor
Laboratory of Growth Regulators, Institute of Experimental Botany of the Czech Academy of Science & Palacky University, Olomouc, Czech Republic
Interests: phytohormones; brassinosteroids; plant steroids; immunoassays (polyclonal/monoclonal antibodies); methods for the determination of plant hormones
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Special Issue Information

Dear Colleagues,

The plant steroid hormones brassinosteroids (BRs) and their precursors play major roles in plant growth, development, and stress tolerance. They act independently and/or in conjuction with other phytohormones. BRs are observed in many plant species and are present in nearly every part of the plant. BRs control, at the cellular level, cell elongation, division, and differentiation and also several traits of agronomic importance such as seed germination, plant architecture, senescence, flowering time, and seed yield and protect plants from a variety of environmental stresses. Over the last two decades, much progress has been made in identifying genes involved in their biosynthesis, metabolism, and signaling pathways. However, there are still some reaction steps and mechanisms of action that remain to be elucidated. Further studies should expand our knowledge of how brassinosteroids are perceived and transduced to regulate plant development and improve crop productivity.

This Special Issue will focus on the latest advances in brassinosteroids research, particularly their biosynthesis, metabolism, interaction with other phytohormones, use in the chemical synthesis of new derivatives and inhibitors, biological activities, and practical use in agriculture. Original research articles and reviews in this field are welcome.

Dr. Jana Oklestkova
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • brassinosteroids
  • biosynthesis and metabolism
  • signaling pathways
  • phytohormonal crosstalk
  • synthetic derivatives and inhibitors
  • isolation and quantification methods
  • agricultural applications

Published Papers (3 papers)

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Research

Article
Wheat Type One Protein Phosphatase Participates in the Brassinosteroid Control of Root Growth via Activation of BES1
Int. J. Mol. Sci. 2021, 22(19), 10424; https://doi.org/10.3390/ijms221910424 - 27 Sep 2021
Viewed by 503
Abstract
Brassinosteroids (BRs) play key roles in diverse plant growth processes through a complex signaling pathway. Components orchestrating the BR signaling pathway include receptors such as kinases, transcription factors, protein kinases and phosphatases. The proper functioning of the receptor kinase BRI1 and the transcription [...] Read more.
Brassinosteroids (BRs) play key roles in diverse plant growth processes through a complex signaling pathway. Components orchestrating the BR signaling pathway include receptors such as kinases, transcription factors, protein kinases and phosphatases. The proper functioning of the receptor kinase BRI1 and the transcription factors BES1/BZR1 depends on their dephosphorylation by type 2A protein phosphatases (PP2A). In this work, we report that an additional phosphatase family, type one protein phosphatases (PP1), contributes to the regulation of the BR signaling pathway. Co-immunoprecipitation and BiFC experiments performed in Arabidopsis plants overexpressing durum wheat TdPP1 showed that TdPP1 interacts with dephosphorylated BES1, but not with the BRI1 receptor. Higher levels of dephosphorylated, active BES1 were observed in these transgenic lines upon BR treatment, indicating that TdPP1 modifies the BR signaling pathway by activating BES1. Moreover, ectopic expression of durum wheat TdPP1 lead to an enhanced growth of primary roots in comparison to wild-type plants in presence of BR. This phenotype corroborates with a down-regulation of the BR-regulated genes CPD and DWF4. These data suggest a role of PP1 in fine-tuning BR-driven responses, most likely via the control of the phosphorylation status of BES1. Full article
(This article belongs to the Special Issue Plant Hormones Brassinosteroids and Its Actions in Plants)
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Article
BZR1 Physically Interacts with SPL9 to Regulate the Vegetative Phase Change and Cell Elongation in Arabidopsis
Int. J. Mol. Sci. 2021, 22(19), 10415; https://doi.org/10.3390/ijms221910415 - 27 Sep 2021
Viewed by 286
Abstract
As sessile organisms, the precise development phase transitions are very important for the success of plant adaptability, survival and reproduction. The transition from juvenile to the adult phase—referred to as the vegetative phase change—is significantly influenced by numbers of endogenous and environmental signals. [...] Read more.
As sessile organisms, the precise development phase transitions are very important for the success of plant adaptability, survival and reproduction. The transition from juvenile to the adult phase—referred to as the vegetative phase change—is significantly influenced by numbers of endogenous and environmental signals. Here, we showed that brassinosteroid (BR), a major growth-promoting steroid hormone, positively regulates the vegetative phase change in Arabidopsis thaliana. The BR-deficient mutant det2-1 and BR-insensitive mutant bri1-301 displayed the increased ratio of leaf width to length and reduced blade base angle. The plant specific transcription factors SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) are key masters for the vegetative phase transition in plants. The expression levels of SPL9, SPL10 and SPL15 were significantly induced by BR treatment, but reduced in bri1-116 mutant compared to wild-type plants. The gain-of-function pSPL9:rSPL9 transgenic plants displayed the BR hypersensitivity on hypocotyl elongation and partially suppressed the delayed vegetative phase change of det2-1 and bri1-301. Furthermore, we showed that BRASSINAZOLE-RESISTANT 1 (BZR1), the master transcription factor of BR signaling pathway, interacted with SPL9 to cooperatively regulate the expression of downstream genes. Our findings reveal an important role for BRs in promoting vegetative phase transition through regulating the activity of SPL9 at transcriptional and post-transcriptional levels. Full article
(This article belongs to the Special Issue Plant Hormones Brassinosteroids and Its Actions in Plants)
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Article
Optimal Brassinosteroid Levels Are Required for Soybean Growth and Mineral Nutrient Homeostasis
Int. J. Mol. Sci. 2021, 22(16), 8400; https://doi.org/10.3390/ijms22168400 - 05 Aug 2021
Cited by 1 | Viewed by 380
Abstract
Brassinosteroids (BRs) are steroid phytohormones that are known to regulate plant growth and nutrient uptake and distribution. However, how BRs regulate nutrient uptake and balance in legume species is not fully understood. Here, we show that optimal BR levels are required for soybean [...] Read more.
Brassinosteroids (BRs) are steroid phytohormones that are known to regulate plant growth and nutrient uptake and distribution. However, how BRs regulate nutrient uptake and balance in legume species is not fully understood. Here, we show that optimal BR levels are required for soybean (Glycine max L.) seedling growth, as treatments with both 24-epicastasterone (24-epiCS) and the BR biosynthesis inhibitor propiconazole (PPZ) inhibit root growth, including primary root elongation and lateral root formation and elongation. Specifically, 24-epiCS and PPZ reduced the total phosphorus and potassium levels in the shoot and affected several minor nutrients, such as magnesium, iron, manganese, and molybdenum. A genome-wide transcriptome analysis identified 3774 and 4273 differentially expressed genes in the root tip after brassinolide and PPZ treatments, respectively. The gene ontology (GO) analysis suggested that genes related to “DNA-replication”, “microtubule-based movement”, and “plant-type cell wall organization” were highly responsive to the brassinolide and PPZ treatments. Furthermore, consistent with the effects on the nutrient concentrations, corresponding mineral transporters were found to be regulated by BR levels, including the GmPHT1s, GmKTs, GmVIT2, GmZIPs, and GmMOT1 genes. Our study demonstrates that optimal BR levels are important for growth and mineral nutrient homeostasis in soybean seedlings. Full article
(This article belongs to the Special Issue Plant Hormones Brassinosteroids and Its Actions in Plants)
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