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Title of Journal: Plant Mol Biol

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Abbravation: Plant Molecular Biology

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Springer Netherlands

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DOI

10.1016/0091-6749(83)90021-0

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ISSN

1573-5028

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Two MYBrelated transcription factors play opposit

Authors: YiShih Chen YiChi Chao TzuWei Tseng ChunKai Huang PeiChing Lo ChungAn Lu
Publish Date: 2016/11/19
Volume: 93, Issue: 3, Pages: 299-311
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Abstract

Sugar regulation of gene expression has profound effects at all stages of the plant life cycle Although regulation at the transcriptional level is one of the most prominent mechanisms by which gene expression is regulated only a few transcription factors have been identified and demonstrated to be involved in the regulation of sugarregulated gene expression OsMYBS1 an R1/2type MYB transcription factor has been demonstrated to be involved in sugar and hormoneregulated αamylase gene expression in rice Arabidopsis contains two OsMYBS1 homologs In the present study we investigate MYBS1 and MYBS2 in sugar signaling in Arabidopsis Our results indicate that MYBS1 and MYBS2 play opposite roles in regulating glucose and ABA signaling in Arabidopsis during seed germination and early seedling developmentMYB proteins have been classified into four subfamilies R2R3MYB R1/2MYB 3RMYB and 4RMYB An R1/2type MYB transcription factor OsMYBS1 has been demonstrated to be involved in sugar and hormoneregulated αamylase genes expression in rice In this study two genes homologous to OsMYBS1 MYBS1 and MYBS2 were investigated in Arabidopsis Subcellular localization analysis showed that MYBS1 and MYBS2 were localized in the nucleus Rice embryo transient expression assays indicated that both MYBS1 and MYBS2 could recognize the sugar response element TAbox in the promoter and induced promoter activity mybs1 mutant exhibited hypersensitivity to glucose whereas mybs2 seedlings were hyposensitive to it MYBS1 and MYBS2 are involved in the control of glucoseresponsive gene expression as the mybs1 mutant displayed increased expression of a hexokinase gene HXK1 chlorophyll a/bbinding protein gene CAB1 ADPglucose pyrophosphorylase gene APL3 and chalcone synthase gene CHS whereas the mybs2 mutant exhibited decreased expression of these genes mybs1 also showed an enhanced response to abscisic acid ABA in the seed germination and seedling growth stages while mybs2 showed reduced responses The ABA biosynthesis inhibitor fluridone rescued the mybs1 glucosehypersensitive phenotype Moreover the mRNA levels of three ABA biosynthesis genes ABA1 NCED9 and AAO3 and three ABA signaling genes ABI3 ABI4 and ABI5 were increased upon glucose treatment of mybs1 seedlings but were decreased in mybs2 seedlings These results indicate that MYBS1 and MYBS2 play opposite roles in regulating glucose and ABA signaling in Arabidopsis during seed germination and early seedling developmentYC YC and CL participated in the design of the study YC YC and TT carried out the gene cloning realtime RTPCR and subcellular localization PL and CH carried out the GUS activity assay TT and CH carried out the bioinformatics analysis YC and CL carried out data analysis and wrote manuscript All authors read and approved the final manuscript

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