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https://www.readbyqxmd.com/read/29337075/brassinosteroids-dominate-hormonal-regulation-of-plant-thermomorphogenesis-via-bzr1
#1
Carla Ibañez, Carolin Delker, Cristina Martinez, Katharina Bürstenbinder, Philipp Janitza, Rebecca Lippmann, Wenke Ludwig, Hequan Sun, Geo Velikkakam James, Maria Klecker, Alexandra Grossjohann, Korbinian Schneeberger, Salome Prat, Marcel Quint
Thermomorphogenesis is defined as the suite of morphological changes that together are likely to contribute to adaptive growth acclimation to usually elevated ambient temperature [1, 2]. While many details of warmth-induced signal transduction are still elusive, parallels to light signaling recently became obvious (reviewed in [3]). It involves photoreceptors that can also sense changes in ambient temperature [3-5] and act, for example, by repressing protein activity of the central integrator of temperature information PHYTOCHROME-INTERACTING FACTOR 4 (PIF4 [6])...
January 5, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29329424/brassinosteroids-regulate-pavement-cell-growth-by-mediating-bin2-induced-microtubule-stabilization
#2
Xiaolei Liu, Qin Yang, Yuan Wang, Linhai Wang, Ying Fu, Xuelu Wang
Brassinosteroids (BRs), a group of plant steroid hormones, play important roles in regulating plant development. The cytoskeleton also affects key developmental processes and a deficiency in BR biosynthesis or signaling leads to abnormal phenotypes similar to those of microtubule-defective mutants. However, how BRs regulate microtubule and cell morphology remains unknown. Here, using liquid chromatography-tandem mass spectrometry, we identified tubulin proteins that interact with Arabidopsis BRASSINOSTEROID INSENSITIVE2 (BIN2), a negative regulator of BR responses in plants...
January 10, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29324765/brassinosteroids-regulate-root-growth-by-controlling-reactive-oxygen-species-homeostasis-and-dual-effect-on-ethylene-synthesis-in-arabidopsis
#3
Bingsheng Lv, Huiyu Tian, Feng Zhang, Jiajia Liu, Songchong Lu, Mingyi Bai, Chuanyou Li, Zhaojun Ding
The brassinosteroids (BRs) represent a class of phytohormones, which regulate numerous aspects of growth and development. Here, a det2-9 mutant defective in BR synthesis was identified from an EMS mutant screening for defects in root length, and was used to investigate the role of BR in root development in Arabidopsis. The det2-9 mutant displays a short-root phenotype, which is result from the reduced cell number in root meristem and decreased cell size in root maturation zone. Ethylene synthesis is highly increased in the det2-9 mutant compared with the wild type, resulting in the hyper-accumulation of ethylene and the consequent inhibition of root growth...
January 11, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29321184/a-sizer-model-for-cell-differentiation-in-arabidopsis-thaliana-root-growth
#4
Irina Pavelescu, Josep Vilarrasa-Blasi, Ainoa Planas-Riverola, Mary-Paz González-García, Ana I Caño-Delgado, Marta Ibañes
Plant roots grow due to cell division in the meristem and subsequent cell elongation and differentiation, a tightly coordinated process that ensures growth and adaptation to the changing environment. How the newly formed cells decide to stop elongating becoming fully differentiated is not yet understood. To address this question, we established a novel approach that combines the quantitative phenotypic variability of wild-type Arabidopsis roots with computational data from mathematical models. Our analyses reveal that primary root growth is consistent with a Sizer mechanism, in which cells sense their length and stop elongating when reaching a threshold value...
January 10, 2018: Molecular Systems Biology
https://www.readbyqxmd.com/read/29315590/brassinosteroids-regulate-glucosinolate-biosynthesis-in-arabidopsis-thaliana
#5
Ji Hyea Lee, Jeongyeo Lee, HyeRan Kim, Won Byoung Chae, Sun-Ju Kim, Yong Pyo Lim, Man-Ho Oh
Plants must constantly adjust their growth and defense responses to deal with the wide variety of stresses they encounter in their environment. Among phytohormones, brassinosteroids (BRs) are an important group of plant steroid hormones involved in numerous aspects of the plant lifecycle including growth, development, and responses to various stresses including insects. Here, we show that BRs regulate glucosinolate (GS) biosynthesis and function in insect herbivory. Preference tests and larval feeding experiments using the generalist herbivore, diamondback moth (Plutella xylostella), revealed that the larvae of this moth prefer to feed on Arabidopsis thaliana brassinosteroid insensitive 1 (bri1-5) plants than on wild-type Ws-2 or BRI1-Flag (bri1-5 background) transgenic plants, which leads an increase in larval weight...
January 5, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29288738/vacuole-integrity-maintained-by-duf300-proteins-is-required-for-brassinosteroid-signaling-regulation
#6
Qinsong Liu, Thomas Vain, Corrado Viotti, Siamsa M Doyle, Danuše Tarkowská, Ondřej Novák, Cyril Zipfel, Folke Sitbon, Stéphanie Robert, Daniel Hofius
Brassinosteroid (BR) hormone signaling controls multiple processes during plant growth and development and is initiated at the plasma membrane through the receptor kinase BRASSINOSTEROID INSENSITIVE1 (BRI1) together with co-receptors such as BRI1-ASSOCIATED RECEPTOR KINASE1 (BAK1). BRI1 abundance is regulated by endosomal recycling and vacuolar targeting, but the role of vacuole-related proteins in BR receptor dynamics and BR responses remain elusive. Here, we show that the absence of two DUF300 domain-containing tonoplast proteins, LAZARUS1 (LAZ1) and LAZ1 HOMOLOG1 (LAZ1H1), causes vacuole morphology defects, growth inhibition, and constitutive activation of BR signaling...
December 27, 2017: Molecular Plant
https://www.readbyqxmd.com/read/29277643/revealing-critical-mechanisms-of-br-mediated-apple-nursery-tree-growth-using-itraq-based-proteomic-analysis
#7
Liwei Zheng, Juanjuan Ma, Lizhi Zhang, Cai Gao, Dong Zhang, Caiping Zhao, Mingyu Han
Brassinosteroid is identified as an important hormone. However, information about brassinosteroid has not been fully elucidated, and few studies concerned its role in apple. The aim of this work was to study the role of brassinosteroid for apple tree growth. In our study, the effect of brassinosteroid on apple nursery tree was analyzed. The biomass, cell size and xylem content of apple nursery tree were obviously evaluated by brassinosteroid treatment; mineral elements contents, photosynthesis indexes, carbohydrate level and hormone contents were significantly high in brassinosteroid treated trees...
December 19, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/29275992/variation-in-splicing-efficiency-underlies-morphological-evolution-in-capsella
#8
Ushio Fujikura, Runchun Jing, Atsushi Hanada, Yumiko Takebayashi, Hitoshi Sakakibara, Shinjiro Yamaguchi, Christian Kappel, Michael Lenhard
Understanding the molecular basis of morphological change remains a central challenge in evolutionary-developmental biology. The transition from outbreeding to selfing is often associated with a dramatic reduction in reproductive structures and functions, such as the loss of attractive pheromones in hermaphroditic Caenorhabditis elegans and a reduced flower size in plants. Here, we demonstrate that variation in the level of the brassinosteroid-biosynthesis enzyme CYP724A1 contributes to the reduced flower size of selfing Capsella rubella compared with its outbreeding ancestor Capsella grandiflora...
December 20, 2017: Developmental Cell
https://www.readbyqxmd.com/read/29275167/abscisic-acid-signaling-inhibits-brassinosteroid-signaling-through-dampening-the-dephosphorylation-of-bin2-by-abi1-and-abi2
#9
Haijiao Wang, Jie Tang, Jing Liu, Jin Hu, Jingjing Liu, Yuxiao Chen, Zhenying Cai, Xuelu Wang
Abscisic acid (ABA) and brassinosteroid (BR) antagonistically regulate many aspects of plant growth and development. A physiological study revealed that the inhibition of BR signaling by ABA is largely dependent on ABI1 and ABI2, but genetic and molecular evidence is lacking. In the BR signaling, their crosstalk occurs after BR receptor complex, but upstream of BIN2. However, which components act as the hub to directly mediate their crosstalk has remains a big mystery. Here, we found that ABI1 and ABI2 interact with BIN2, and dephosphorylate BIN2 to regulate its activity on the phosphorylation of BES1...
December 21, 2017: Molecular Plant
https://www.readbyqxmd.com/read/29258205/insights-into-the-structural-requirements-of-potent-brassinosteroids-as-vegetable-growth-promoters-using-second-internode-elongation-as-biological-activity-comfa-and-comsia-studies
#10
Karoll Ferrer-Pertuz, Luis Espinoza, Jaime Mella
In the present study, we have employed the ligand-based drug design technique, 3D-QSAR, through a comparative molecular field analysis (CoMFA) and a comparative molecular similarity indices analysis (CoMSIA) to determine the key factors for the plant growth promoting activity of brassinosteroids reported in literature, using the bean second-internode bioassay measured on two groups of compounds with different molar concentrations. This is the first 3D-QSAR study using the second internode elongation as biological activity...
December 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29243177/24-epibrassinolide-induced-alterations-in-the-root-cell-walls-of-cucumis-sativus-l-under-ca-no3-2-stress
#11
Ya-Hong An, Heng Zhou, Ying-Hui Yuan, Lin Li, Jin Sun, Sheng Shu, Shi-Rong Guo
Brassinosteroids (BRs) can effectively alleviate the oxidative stress caused by Ca(NO3)2 in cucumber seedlings. The root system is an essential organ in plants due to its roles in physical anchorage, water and nutrient uptake, and metabolite synthesis and storage. In this study, 24-epibrassinolide (EBL) was applied to the cucumber seedling roots under Ca(NO3)2 stress, and the resulting chemical and anatomical changes were characterized to investigate the roles of BRs in alleviating salinity stress. Ca(NO3)2 alone significantly induced changes in the components of cell wall, anatomical structure, and expression profiles of several lignin biosynthetic genes...
December 14, 2017: Protoplasma
https://www.readbyqxmd.com/read/29242230/paracrine-brassinosteroid-signaling-at-the-stem-cell-niche-controls-cellular-regeneration
#12
Fidel Lozano-Elena, Ainoa Planas-Riverola, Josep Vilarrasa-Blasi, Rebecca Schwab, Ana I Caño-Delgado
Stem cell regeneration is crucial for both cell turnover and tissue healing in multicellular organisms. In Arabidopsis roots, a reduced group of cells known as the quiescent center (QC) acts as a cell reservoir for surrounding stem cells during both normal growth and in response to external damage. Although cells of the QC have a very low mitotic activity, plant hormones such as brassinosteroids (BR) can promote QC divisions. Here, we used a tissue-specific strategy to investigate the spatial signaling requirements of BR-mediated QC divisions...
December 14, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/29238862/pursuing-extreme-sensitivity-for-determination-of%C3%A2-endogenous-brassinosteroids-through-direct-fishing-from-plant-matrices-and-eliminating-most-interferences-with-boronate-affinity-magnetic-nanoparticles
#13
Peiyong Xin, Bingbing Li, Jijun Yan, Jinfang Chu
Brassinosteroids (BRs) are important plant hormones regulating plant growth and development. High-performance analytical methods for quantifying endogenous BRs are important for studying the molecular mechanisms of BR action. Herein we developed a high-performance sample pretreatment method based on boronate affinity magnetic nanoparticles (BAMNPs). The high specificity of boronate affinity enables direct fishing of BRs from plant matrices. The strong binding energy makes it possible to remove most contaminants in plant matrices with a small loss of target BRs...
December 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29231846/the-discrepant-and-similar-responses-of-genome-wide-transcriptional-profiles-between-drought-and-cold-stresses-in-cassava
#14
Changying Zeng, Zehong Ding, Fang Zhou, Yufei Zhou, Ruiju Yang, Zi Yang, Wenquan Wang, Ming Peng
Background: Cassava, an important tropical crop, has remarkable drought tolerance, but is very sensitive to cold. The growth, development, and root productivity of cassava are all adversely affected under cold and drought. Methods: To profile the transcriptional response to cold and drought stresses, cassava seedlings were respectively subjected to 0, 6, 24, and 48 h of cold stress and 0, 4, 6, and 10 days of drought stress. Their folded leaves, fully extended leaves, and roots were respectively investigated using RNA-seq...
December 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29223877/transcriptomic-analyses-reveal-complex-and-interconnected-sucrose-signaling-cascades-in-developing-seeds-of-castor-bean
#15
Bin Wang, Yang Zhang, Mohammad Enamul Haque, Wei Xu, Fei Li, Aizhong Liu
Seeds are highly specific organs that strongly sink sucrose resources from leaf and stem tissues to trigger seed metabolism and development. In particular, for heterotrophic non-green seeds, the potential molecular mechanism underlying sucrose-driven seed development remains unanswered. Castor bean (Ricinus communis L.), a typical non-green seed, has been considered as a model plant for seed biology study in dicotyledonous plants due to its heterotrophic seeds with persistent endosperms. In the present study, the fast-developing castor bean seeds were treated with exogenous sucrose and mannitol for four hours...
December 6, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29215737/nitric-oxide-as-a-signaling-molecule-in-brassinosteroid-mediated-virus-resistance-to-cucumber-mosaic-virus-in-arabidopsis-thaliana
#16
Li-Juan Zou, Xing-Guang Deng, Li-E Zhang, Tong Zhu, Wen-Rong Tan, Arfan Muhammad, Li-Jun Zhu, Chao Zhang, Da-Wei Zhang, Hong-Hui Lin
Brassinosteroids (BRs) are growth-promoting plant hormones that play a crucial role in biotic stress responses. Here, we found that BR treatment increased nitric oxide (NO) accumulation, and a significant reduction of virus accumulation in Arabidopsis thaliana. However, the plants pre-treated with NO scavenger (PTIO) or nitrate reductase (NR) inhibitor (tungstate) were hardly generated NO generation and appeared to have the highest viral replication and suffer more damages. Furthermore, the antioxidant system and photosystem parameters were up-regulated in brassinolide (BL) - treated plants but down regulated in PTIO- or tungstate-treated plants, suggesting NO may be involved in BRs induced virus resistance in Arabidopsis...
December 7, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/29215730/non-enzymatic-antioxidant-accumulations-in-br-deficient-and-br-insensitive-barley-mutants-under-control-and-drought-conditions
#17
Damian Gruszka, Anna Janeczko, Michal Dziurka, Ewa Pociecha, Jozsef Fodor
Drought is one of the most adverse stresses that affect plant growth and yield. Disturbances in metabolic activity resulting from drought cause overproduction of reactive oxygen species (ROS). It is postulated that brassinosteroids (BRs) regulate plant tolerance to the stress conditions, but the underlying mechanisms remain largely unknown. An involvement of endogenous BRs in regulation of the antioxidant homeostasis is not fully clarified either. Therefore, the aim of this study was to elucidate the role of endogenous BRs in regulation of non-enzymatic antioxidants in barley (Hordeum vulgare) under control and drought conditions...
December 7, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/29213317/dynamic-changes-in-transcriptome-and-cell-wall-composition-underlying-brassinosteroid-mediated-lignification-of-switchgrass-suspension-cells
#18
Xiaolan Rao, Hui Shen, Sivakumar Pattathil, Michael G Hahn, Ivana Gelineo-Albersheim, Debra Mohnen, Yunqiao Pu, Arthur J Ragauskas, Xin Chen, Fang Chen, Richard A Dixon
Background: Plant cell walls contribute the majority of plant biomass that can be used to produce transportation fuels. However, the complexity and variability in composition and structure of cell walls, particularly the presence of lignin, negatively impacts their deconstruction for bioenergy. Metabolic and genetic changes associated with secondary wall development in the biofuel crop switchgrass (Panicum virgatum) have yet to be reported. Results: Our previous studies have established a cell suspension system for switchgrass, in which cell wall lignification can be induced by application of brassinolide (BL)...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29211989/allosteric-control-of-a-plant-receptor-kinase-through-s-glutathionylation
#19
Alexander S Moffett, Kyle W Bender, Steven C Huber, Diwakar Shukla
Growing evidence supports the importance of protein S-glutathionylation as a regulatory post-translational modification with functional consequences for proteins. Discoveries of redox-state-dependent protein kinase S-glutathionylation have fueled discussion of redox-sensitive signaling. Following previously published experimental evidence for S-glutathionylation induced deactivation of the Arabidopsis thaliana kinase BRASSINOSTEROID INSENSITIVE 1-ASSOCIATED RECEPTOR-LIKE KINASE 1 (BAK1), we investigated the consequences of S-glutathionylation on the equilibrium conformational ensemble of BAK1 using all-atom molecular dynamics simulations...
December 5, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/29209339/overexpression-of-socyp85a1-a-spinach-cytochrome-p450-gene-in-transgenic-tobacco-enhances-root-development-and-drought-stress-tolerance
#20
Fangmeng Duan, Jun Ding, Dongsun Lee, Xueli Lu, Yuqi Feng, Wenwen Song
Brassinosteroids (BRs) play an essential role in plant growth, development, and responses to diverse abiotic stresses. However, previous studies mainly analyzed how exogenous BRs influenced plant physiological reactions to drought stress, therefore, genetic evidences for the endogenous BRs-mediated regulation of plant responses still remain elusive. In this study, a key BRs biosynthetic gene, SoCYP85A1 was cloned from Spinacia oleracea, which has a complete open reading frame of 1,392 bp encoding a 464 amino acid peptide and shares high sequence similarities with CYP85A1 from other plants...
2017: Frontiers in Plant Science
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