Developing a model of plant hormone interactions

Wang, Yu Hua; Irving, Helen Ruth

doi:10.4161/psb.6.4.14558

Cited by 202 publications

(113 citation statements)

References 67 publications

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“…The genes that code for enzymes like 3-b-hydroxysteroid dehydrogenase/ isomerase, leucoanthocyanidin reductase, and NADdependent epimerase/dehydratase, which are involved in brassinosteroid biosynthesis, showed more than 2-fold repression in OsbZIP48 OE transgenics, which could possibly result in the repression of brassinosteroid biosynthesis. Brassinosteroids are known to affect cell expansion and division, reproductive development, tissue differentiation, and stress resistance (Wang and Irving, 2011). Therefore, reduction in brassinosteroid biosynthesis also may be involved in the semidwarf phenotype of OsbZIP48 OE transgenics raised in this study.…”

Section: Osbzip48 Controls Plant Height In Ricementioning

confidence: 80%

“…Jasmonic acid is known to be involved in plant defense, and insufficient jasmonic acid results in sterile floral organs. It plays a central role in the biosynthesis of secondary metabolites that protect plants from biotic and abiotic stresses (Wang and Irving, 2011). Therefore, it will be interesting to study the role of OsbZIP48 in biotic and abiotic stresses.…”

Section: Osbzip48 Controls Plant Height In Ricementioning

confidence: 99%

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OsbZIP48, a HY5 Transcription Factor Ortholog, Exerts Pleiotropic Effects in Light-Regulated Development

2017

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Plants have evolved an intricate network of sensory photoreceptors and signaling components to regulate their development. Among the light signaling components identified to date, HY5, a basic leucine zipper (bZIP) transcription factor, has been investigated extensively. However, most of the work on HY5 has been carried out in Arabidopsis (Arabidopsis thaliana), a dicot. In this study, based on homology search and phylogenetic analysis, we identified three homologs of AtHY5 in monocots; however, AtHYH (HY5 homolog) homologs are absent in the monocots analyzed. Out of the three homologs identified in rice (Oryza sativa), we have functionally characterized OsbZIP48. OsbZIP48 was able to complement the Athy5 mutant. OsbZIP48 protein levels are developmentally regulated in rice. Moreover, the OsbZIP48 protein does not degrade in dark-grown rice and Athy5 seedlings complemented with OsbZIP48, which is in striking contrast to AtHY5. In comparison with AtHY5, which does not cause any change in hypocotyl length when overexpressed in Arabidopsis, the overexpression of full-length OsbZIP48 in rice transgenics reduced the plant height considerably. Microarray analysis revealed that OsKO2, which encodes ent-kaurene oxidase 2 of the gibberellin biosynthesis pathway, is down-regulated in OsbZIP48OE and up-regulated in OsbZIP48 KD transgenics as compared with the wild type. Electrophoretic mobility shift assay showed that OsbZIP48 binds directly to the OsKO2 promoter. The RNA interference lines and the T-DNA insertional mutant of OsbZIP48 showed seedling-lethal phenotypes despite the fact that roots were more proliferative during early stages of development in the T-DNA insertional mutant. These data provide credible evidence that OsbZIP48 performs more diverse functions in a monocot system like rice in comparison with its Arabidopsis ortholog, HY5.

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Section: Osbzip48 Controls Plant Height In Ricementioning

confidence: 80%

Section: Osbzip48 Controls Plant Height In Ricementioning

confidence: 99%

OsbZIP48, a HY5 Transcription Factor Ortholog, Exerts Pleiotropic Effects in Light-Regulated Development

2017

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“…Cytokinin action, like that of other phytohormones, is mainly pleiotropic. Its impact depends on the concentration ratio of different plant hormones, as well as the balance and cross-talk between them (Pieterse et al, 2009;Wang and Irving, 2011).…”

Section: Introductionmentioning

confidence: 99%

New insights into the signaling and function of cytokinins in higher plants

Ciesielska¹,

Ruszkowski²,

Kasperska³

et al. 2012

bta

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Phytohormones (plant hormones) play a role in the regulation of cellular activities including cell division, elongation and differentiation, pattern formation, organogenesis, reproduction, sex determination, and responses to abiotic and biotic stress. The phytohormonal signal transduction pathways operate via cytokinin perception by transmembrane receptors consisting of two domains: an extracellular domain responsible for hormone binding and an intracellular domain, sensory His / Asp kinase (HK). Upon phytohormone binding, the receptor undergoes a conformational change which activates its protein kinase activity. The phosphorylated intracellular domain transfers the phosphoryl group to the His residue of the histidine phosphotransfer protein (HPt) which in turn phosphorylates Asp residue in the Response Regulator (RR). The phosphorylated RR protein acts as either a positive or negative transcription factor that interacts with the gene promoter or other target protein. The two-component signaling pathway, operating through the His-Asp phosphorelay, controls many physiological and developmental processes throughout the plant lifecycle (from seed-to-seed). Downstream plant hormone signaling also includes proteolysis of transcriptional regulators that block the activity of transcription factors. Two-component signaling operates more frequently in higher plants. Five classic plant hormones had been discovered by the middle of the twentieth century: auxins, cytokinins, gibberellins, ethylene and abscisic acid. The more recently characterized hormones include brassinosteroids, strigolactones, jasmonates and salicylates. Considering the tremendous work that has been undertaken during the last decades, in this review we decided to concentrate on cytokinin signaling in various plant developmental processes, including responses to biotic and abiotic stresses.

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“…10 For effective coordination, hormone levels need to be modulated in a rather complicated network of operations. 11 This means that artIcLe addendum but given the velocity, we have hypothesized that it could be electrical. 5 Long distance electrical signaling can invoke action potentials or variation potentials.…”

Section: Feedback-regulation Of Pnp Productionmentioning

confidence: 99%

“…17 A broad array of cellular activities including cell cycle, DNA repair, cell growth and differentiation, protein quality control and regulation of receptors (membrane and intracellular) and ion channels are regulated by the ubiquitin proteasome system. 11,18 The system works via enzymes that attach ubiquitin proteins to target proteins, and subsequently subject the target proteins for degradation. 17,19 The ubiquitin proteasome system is probably involved in PNP degradation, although other subcellular sites for protein degradation include lysosomes and vacuoles in plants.…”

Section: Feedback-regulation Of Pnp Productionmentioning

confidence: 99%

Plant natriuretic peptides

Wang

Donaldson

Gehring

et al. 2011

Plant Signaling & Behavior

Self Cite

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Plant natriuretic peptides (PNPs) are immunological analogs of mammalian atrial natriuretic peptides that have homeostatic roles in plants. We have previously demonstrated that PNPs and PNP analogs have an emerging role in the regulation of ion fluxes, stomatal movement and fluid circulation in plants. 1,2 In addition, PNP affects plant biological activities such as photosynthesis and respiration both locally and at long distances. 3-5Moreover, we recently demonstrated that PNPs were secreted into the apoplast and their expression was upregulated under several stress conditions and importantly PNP was able to modulate its own expression.6 Therefore, here we attempt to further address the control mechanisms of PNP production in planta and the relationship between PNP and plant homeostasis.

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Developing a model of plant hormone interactions

Cited by 202 publications

References 67 publications

OsbZIP48, a HY5 Transcription Factor Ortholog, Exerts Pleiotropic Effects in Light-Regulated Development

OsbZIP48, a HY5 Transcription Factor Ortholog, Exerts Pleiotropic Effects in Light-Regulated Development

New insights into the signaling and function of cytokinins in higher plants

Plant natriuretic peptides

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