D1,RGA1

2022-11-15 | Categories genes  | Tags BR signaling  brassinosteroid  ethylene  seed  gibberellin  lamina  dwarf  BR  abiotic stress  growth  cellular proliferation  drought  leaf  disease resistance  seed size  lemma  disease  ga  blast  root  adventitious root  phytohormone  sheath  defense  cell death  development  breeding 

• Information
  • Symbol: D1,RGA1
  • MSU: LOC_Os05g26890
  • RAPdb: Os05g0333200
• PSP score
  • LOC_Os05g26890.1: 0.021
• PLAAC score
  • LOC_Os05g26890.1: 0
• pLDDT score
  • NA
• Publication
  • Rice heterotrimeric G-protein alpha subunit RGA1: in silico analysis of the gene and promoter and its upregulation under abiotic stress, 2013, Plant Physiol Biochem.
  • Molecular cloning and characterization of RGA1 encoding a G protein alpha subunit from rice Oryza sativa L. IR-36, 1995, Plant Mol Biol.
  • Heterotrimeric G protein alpha subunit is involved in rice brassinosteroid response, 2006, Cell Res.
  • Study of novel d1 alleles, defective mutants of the α subunit of heterotrimeric G-protein in rice, 2009, Genes Genet Syst.
  • Suppression of the rice heterotrimeric G protein beta-subunit gene, RGB1, causes dwarfism and browning of internodes and lamina joint regions, 2011, Plant J.
  • The U-box E3 ubiquitin ligase TUD1 functions with a heterotrimeric G alpha subunit to regulate Brassinosteroid-mediated growth in rice, 2013, PLoS Genet.
  • Function and expression pattern of the alpha subunit of the heterotrimeric G protein in rice, 2010, Plant Cell Physiol.
  • Heterotrimeric G protein signaling is required for epidermal cell death in rice, 2009, Plant Physiol.
  • BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice, 2009, Plant Physiol.
  • Rice gibberellin-insensitive dwarf mutant gene Dwarf1 encodes the alpha-subunit of GTP-binding protein, 1999, Proc Natl Acad Sci U S A.
  • Rice dwarf mutantd1, which is defective in the a subunit of the heterotrimeric G protein, affects gibberellin signal transduction, 2000, Proc Natl Acad Sci U S A.
  • A metastable DWARF1 epigenetic mutant affecting plant stature in rice, 2009, Proc Natl Acad Sci U S A.
  • Suppression of the heterotrimeric G protein causes abnormal morphology, including dwarfism, in rice, 1999, Proc Natl Acad Sci U S A.
  • The heterotrimeric G protein alpha subunit acts upstream of the small GTPase Rac in disease resistance of rice, 2002, Proc Natl Acad Sci U S A.
  • The α-subunit of the rice heterotrimeric G protein, RGA1, regulates drought tolerance during the vegetative phase in the dwarf rice mutant d1., 2016, J Exp Bot.
• Genbank accession number
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
  • AB026176
  • AB026177
  • AB026178
  • AB026179
  • AB026180
  • AB028602
  • AB028603
  • D38232
• Key message
  • These results indicate that BU1 protein is a positive regulator of BR response: it controls bending of the lamina joint in rice and it is a novel primary response gene that participates in two BR signaling pathways through OsBRI1 and RGA1
  • In the present study, we used root elongation inhibition assay, lamina inclination assay and coleoptile elongation analysis to demonstrated reduced sensitivity of d1 mutant plants (caused by the null mutation of RGA) to 24-epibrassinolide (24-epiBL), which belongs to brassinosteroids and plays a wide variety of roles in plant growth and development
  • In d1 plants, cell death in response to ethylene and H(2)O(2) was nearly completely abolished, indicating that signaling through Galpha is essential
  • Nine alleles of d1 showed a severer phenotype whilst d1-4 exhibited a mild phenotype with respect to seed size and elongation pattern of internodes
  • Because the d1 mutant is classified as gibberellin-insensitive, we suggest that the GTP-binding protein might be associated with gibberellin signal transduction
  • We identified a spontaneous rice mutant, Epi-d1, that shows a metastable dwarf phenotype
  • The phenotype is mitotically and meiotically inheritable and corresponds to the metastable epigenetic silencing of the DWARF1 (D1) gene
  • To identify novel BR-related genes in rice (Oryza sativa), we monitored the transcriptomic response of the brassinosteroid deficient1 (brd1) mutant, with a defective BR biosynthetic gene, to brassinolide treatment
  • In addition, compared to the wild type, the induction of BU1 by exogenous brassinolide did not require de novo protein synthesis and it was weaker in a BR receptor mutant OsbriI (Oryza sativa brassinosteroid insensitive1, d61) and a rice G protein alpha subunit (RGA1) mutant d1
  • Previous studies suggested that the heterotrimeric G protein alpha subunit known as D1/RGA1 in rice is involved in a phytohormone gibberellin-mediated signaling pathway
  • Indica group Swarna [RGA1(I), accession number HQ634688], its promoter and its transcript upregulation in response to abiotic stresses
  • Rice heterotrimeric G-protein alpha subunit (RGA1): in silico analysis of the gene and promoter and its upregulation under abiotic stress
  • In this study, we report a D1 genetic interactor Taihu Dwarf1 (TUD1) that encodes a functional U-box E3 ubiquitin ligase
  • Histological observations showed that the dwarf phenotype of tud1 is mainly due to decreased cell proliferation and disorganized cell files in aerial organs
  • Genetic, phenotypic, and physiological analyses have shown that tud1 is epistatic to d1 and is less sensitive to BR treatment
  • This supports the idea that a D1-mediated BR signaling pathway occurs in rice to affect plant growth and development
  • The U-box E3 ubiquitin ligase TUD1 functions with a heterotrimeric G alpha subunit to regulate Brassinosteroid-mediated growth in rice
  • We used rice dwarf1 (d1) mutants lacking a single-copy Galpha gene and addressed Galpha’s role in disease resistance
  • The RGB1 knock-down lines generated in d1-5 were shorter, suggesting RGB1 to be a positive regulator of cellular proliferation, in addition to RGA1
  • The transcript profiling of RGA1(I) showed upregulation following NaCl, cold and drought stress
  • Here, we describe a novel BR-induced rice gene BRASSINOSTEROID UPREGULATED1 (BU1), encoding a helix-loop-helix protein
  • BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice
  • The GA sensitivity of second leaf sheath elongation in d1 was similar to that of the wild type in terms of dose responsiveness, but the response of internode elongation to GA was much lower in d1
  • The d1 mutant, which is deficient for the heterotrimeric G-protein alpha subunit (Galpha) gene of rice, shows dwarfism and sets small round seeds
  • Both transgenic lines showed browning of the lamina joint regions and nodes that could be attributed to a reduction of RGB1 function, as the abnormality was not observed in d1-5
  • To determine whether dwarfism in d1 is due to a reduction in cell number or to shortened cell length, the cell number of the leaf sheath, the internode, the root and the lemma was compared between Nipponbare, a wild-type rice and d1-5, a d1 allele derived from Nipponbare
  • In addition, cell enlargement was found in roots and lemma of d1-5, although the organ length in d1-5 was shorter than that of wild-type rice
  • Evidence also implicates D1 in the action of a second phytohormone Brassinosteroid (BR) and its pathway
  • Compared with the wild type, GA induction of alpha-amylase activity in aleurone cells of d1 was greatly reduced
  • However, in the presence of high GA concentrations, alpha-amylase induction occurred even in d1
  • Furthermore, Os20ox expression was up-regulated, and the GA content was elevated in the stunted internodes of d1
  • In addition, a double mutant between d1 and another GA-signaling mutant, slr, revealed that SLR is epistatic to the D1, supporting that the Galpha protein is involved in GA signaling
  • As brassinosteroid signaling was known to be partially impaired in d1s, the sensitivity to 24-epibrassinolide (24-epiBL) was compared among d1 alleles in a T65 genetic background
  • The dwarf1 (d1) mutant of rice has repressed expression of the Galpha subunit RGA1 of heterotrimeric G protein
  • d1 mutants exhibited a highly reduced hypersensitive response to infection by an avirulent race of rice blast
  • Expression of the constitutively active OsRac1, a small GTPase Rac of rice, in d1 mutants restored SE-dependent defense signaling and resistance to rice blast
  • Analysis of genes encoding proteins related to G protein signaling revealed that four small GTPase genes, two GTPase-activating protein genes, and one GDP dissociation inhibitor gene but not RGA1 were differentially expressed in epidermal cells above adventitious roots, indicating that Galpha activity is regulated posttranscriptionally
  • Previously, we reported that the rice dwarf mutant, d1, is defective in the alpha subunit of the heterotrimeric G protein (Galpha)
  • Rice dwarf mutantd1, which is defective in the a subunit of the heterotrimeric G protein, affects gibberellin signal transduction
  • In the present study, gibberellin (GA) signaling in d1 and the role of the Galpha protein in the GA-signaling pathway were investigated
  • Transcriptional regulation was not generally affected in the d1 mutant, indicating that altered gene expression is not sufficient to trigger cell death in the absence of Galpha
  • Accordingly, it may be useful to incorporate RGA1 mutation in breeding or biotechnological strategies for development of drought-resistant rice
  • We studied physiological responses to progressive drought of the dwarf rice mutant, d1, in which the RGA1 gene, which encodes the GTP-binding α-subunit of the heterotrimeric G protein, is non-functional
• Connection
  • D1~RGA1, RGB1, Suppression of the rice heterotrimeric G protein beta-subunit gene, RGB1, causes dwarfism and browning of internodes and lamina joint regions, RGB1 knock-down lines were generated in the wild type and d1-5, a mutant deficient for the heterotrimeric G protein alpha-subunit (Galpha) gene (RGA1)
  • D1~RGA1, RGB1, Suppression of the rice heterotrimeric G protein beta-subunit gene, RGB1, causes dwarfism and browning of internodes and lamina joint regions, Both transgenic lines showed browning of the lamina joint regions and nodes that could be attributed to a reduction of RGB1 function, as the abnormality was not observed in d1-5
  • D1~RGA1, RGB1, Suppression of the rice heterotrimeric G protein beta-subunit gene, RGB1, causes dwarfism and browning of internodes and lamina joint regions, The RGB1 knock-down lines generated in d1-5 were shorter, suggesting RGB1 to be a positive regulator of cellular proliferation, in addition to RGA1
  • D1~RGA1, TUD1~DSG1, The U-box E3 ubiquitin ligase TUD1 functions with a heterotrimeric G alpha subunit to regulate Brassinosteroid-mediated growth in rice, In this study, we report a D1 genetic interactor Taihu Dwarf1 (TUD1) that encodes a functional U-box E3 ubiquitin ligase
  • D1~RGA1, TUD1~DSG1, The U-box E3 ubiquitin ligase TUD1 functions with a heterotrimeric G alpha subunit to regulate Brassinosteroid-mediated growth in rice, Genetic, phenotypic, and physiological analyses have shown that tud1 is epistatic to d1 and is less sensitive to BR treatment
  • D1~RGA1, TUD1~DSG1, The U-box E3 ubiquitin ligase TUD1 functions with a heterotrimeric G alpha subunit to regulate Brassinosteroid-mediated growth in rice, Furthermore, we found that D1 directly interacts with TUD1
  • D1~RGA1, TUD1~DSG1, The U-box E3 ubiquitin ligase TUD1 functions with a heterotrimeric G alpha subunit to regulate Brassinosteroid-mediated growth in rice, Taken together, these results demonstrate that D1 and TUD1 act together to mediate a BR-signaling pathway
  • BU1, D1~RGA1, BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice, In addition, compared to the wild type, the induction of BU1 by exogenous brassinolide did not require de novo protein synthesis and it was weaker in a BR receptor mutant OsbriI (Oryza sativa brassinosteroid insensitive1, d61) and a rice G protein alpha subunit (RGA1) mutant d1
  • BU1, D1~RGA1, BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice, These results indicate that BU1 protein is a positive regulator of BR response: it controls bending of the lamina joint in rice and it is a novel primary response gene that participates in two BR signaling pathways through OsBRI1 and RGA1
  • D1~RGA1, D61~OsBRI1, BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice, In addition, compared to the wild type, the induction of BU1 by exogenous brassinolide did not require de novo protein synthesis and it was weaker in a BR receptor mutant OsbriI (Oryza sativa brassinosteroid insensitive1, d61) and a rice G protein alpha subunit (RGA1) mutant d1
  • D1~RGA1, D61~OsBRI1, BRASSINOSTEROID UPREGULATED1, encoding a helix-loop-helix protein, is a novel gene involved in brassinosteroid signaling and controls bending of the lamina joint in rice, These results indicate that BU1 protein is a positive regulator of BR response: it controls bending of the lamina joint in rice and it is a novel primary response gene that participates in two BR signaling pathways through OsBRI1 and RGA1
  • D1~RGA1, OsMYBGA~OsGAMYB, Rice dwarf mutantd1, which is defective in the a subunit of the heterotrimeric G protein, affects gibberellin signal transduction, Relative to the wild type, the GA(3)-treated aleurone layer of d1 had lower expression of Ramy1A, which encodes alpha-amylase, and OsGAMYB, which encodes a GA-inducible transcriptional factor, and no increase in expression of Ca(2 +)-ATPase
  • D1~RGA1, OsRac1, The heterotrimeric G protein alpha subunit acts upstream of the small GTPase Rac in disease resistance of rice, Expression of the constitutively active OsRac1, a small GTPase Rac of rice, in d1 mutants restored SE-dependent defense signaling and resistance to rice blast
  • D1~RGA1, OsFtsH2, Involvement of Abscisic Acid in PSII Photodamage and D1 Protein Turnover for Light-Induced Premature Senescence of Rice Flag Leaves., The participation of ABA in the timing of senescence initiation and in the subsequent rate of leaf senescence was closely associated with PSII photodamage and D1 protein turnover during leaf senescence, in which the transcriptional expression of several key genes (psbA, psbB, psbC and OsFtsH2) involved in D1 protein biosynthesis and PSII repair cycle was seriously suppressed by the significantly increased ABA level
  • D1~RGA1, OsFtsH2, Involvement of Abscisic Acid in PSII Photodamage and D1 Protein Turnover for Light-Induced Premature Senescence of Rice Flag Leaves., OsFtsH2 transcriptional expression possibly played an important role in the regulation of D1 protein turnover and PSII repair cycle in relation to ABA mediated leaf senescence

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