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The Arabidopsis type-B cytokinin response regulators ARR1, ARR10 and ARR12 negatively regulate plant responses to drought

ABSTRACT: To understand the role of the Arabidopsis type-B Response Regulators ARR1, ARR10 and ARR12 in water stress response, we have carried out comparative expression analysis of the arr1,10,12 mutant and WT plants under dehydration and well-watered (control) conditions. Agilent’s whole Arabidopsis Gene Expression Microarray (G2519F-021169, V4, 4x44K) was used.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE74880 | GEO | 2016/01/13

SECONDARY ACCESSION(S): PRJNA301717

REPOSITORIES: GEO

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The Arabidopsis type-B cytokinin response regulators ARR1, ARR10 and ARR12 negatively regulate plant responses to drought

Project description:To understand the role of the Arabidopsis type-B Response Regulators ARR1, ARR10 and ARR12 in water stress response, we have carried out comparative expression analysis of the arr1,10,12 mutant and WT plants under dehydration and well-watered (control) conditions. Agilentâs whole Arabidopsis Gene Expression Microarray (G2519F-021169, V4, 4x44K) was used. Two-week-old WT and arr1,10,12 mutant plants were transferred from GM plates to soil and grown for 10 additional day. Aerial portions of 24-d-old plants were detached and exposed to dehydration on KimTowel papers for 0 (well-watered, control), 2 and 4 h. Rosette leaves collected in 3 biological repeats from arr1,10,12 and WT plants treated by dehydration for 0, 2 and 4 h were used for microarray and expression analyses. Total RNA was prepared and used for the microarray hybridization. Three independent biological replicates were used for each plant sample.

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Comparative expression analysis of the Arabidopsis karrikin (KAR)-receptor mutant, kai2-2, and wild type (WT) plants (Col-0) under dehydration conditions

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Expression data in an Arabidopsis cytokinin (CK)-signaling mutant, ahp2,3,5 and arr1,10,12, and its wild type plant (WT, Col-0) under high salinity (200 mM NaCl) and control (0 mM NaCl) conditions.

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Project description:Effect of the cytokinin BA on wt and arr1,10,12 mutant seedlings The type B Arabidopsis Response Regulators (ARRs) of Arabidopsis thaliana are transcription factors that act as positive regulators in the two-component cytokinin signaling pathway. We employed a mutant-based approach to perform a detailed characterization of the roles of ARR1, ARR10, and ARR12 in plant growth and development. The most pronounced phenotype was found in the arr1-3 arr10-5 arr12-1 triple loss-of-function mutant, which showed almost complete insensitivity to high levels of exogenously applied cytokinins. The triple mutant exhibited reduced stature due to decreased cell division in the shoot, enhanced seed size, increased sensitivity to light, altered chlorophyll and anthocyanin concentrations, and an aborted primary root with protoxylem but no metaxylem. Microarray analysis revealed that expression of the majority of cytokinin-regulated genes requires the function of ARR1, ARR10, and ARR12. Characterization of double mutants revealed differing contributions of the type B ARRs to mutant phenotypes. Our results support a model in which cytokinin regulates a wide array of downstream responses through the action of a multistep phosphorelay that culminates in transcriptional regulation by ARR1, ARR10, and ARR12. This data was originally made available through ArrayExpress under the accession number E-MEXP-1573.

2014-02-12 | GSE54870 | GEO

Comparative expression analysis of the Arabidopsis strigolactone (SL)-response mutant, max2-3, and wild type (WT) plants (Col-0) under dehydration conditions.

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2013-11-26 | E-GEOD-48949 | biostudies-arrayexpress

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