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Analysis of the Arabidopsis shoot meristem transcriptome during floral transition identifies distinct regulatory patterns and an LRR protein that promotes flowering

ABSTRACT: We sequenced cDNA synthesized from mRNA from 3 time points of a time course of Arabidopsis thaliana shoot apical meristems. Plants were grown two weeks in short days (time point +0LD) and then exposed to long days for 1 day (time point +1LD) and 3 days (time point +3LD). Meristem cells were collected using laser capture microdissection, to generate a meristem-specific time course of gene expression in the early stages of floral induction. The experiment was done in three biological replicates (called A, B, and C). Some repetitions of sequencing on a few samples (technical replicates) were also done

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE34476 | GEO | 2012/02/01

SECONDARY ACCESSION(S): PRJNA151357

REPOSITORIES: GEO

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Project description:Plant inflorescence meristems and floral meristems possess specific boundary domains that result in floral organ separation, and in proper numbers of floral organs. HANABA TARANU (HAN) encodes a boundary-expressing GATA type zinc finger transcription factor that regulates shoot apical meristem organization, cell division and flower development in Arabidopsis, but the underlying mechanism remains unclear. Through time-course whole genome oligonucleotide microarray analyses following transient overexpression of HAN, we find that HAN represses hundreds of genes, especially genes involved in hormone responses and floral organ regulation. Transient overexpression of HAN also causes the repression of HAN itself and three other HAN family genes: HANL2 (HAN-LIKE2), GNC (GATA, NITRATE-INDUCIBLE, CARBON-METABOLISM-INVOLVED) and GNL (GNC LIKE), forming a negative regulatory feedback loop. Double- and triple-mutant strains of han with hanl2, gnc and gnl show synergistic effects on sepal fusion, petal number, and silique length, and embryo development, as well as carpelloid stamens. Transcripts of HANL2, GNC and GNL have similar accumulation patterns, specifically in petals, stamens, carpels and inflorescence meristems, which are partially overlapping with the expression pattern of HAN, suggesting that HAN and HAN family genes share redundant functions during flower development. We further show by yeast two hybrid assays that HAN can homodimerize as well as heterodimerize with other HAN family proteins. Chromatin-immunoprecipitation analyses indicate that HAN directly binds to its own promoter and the promoter of GNC in vivo. These findings, together with the fact that constitutive overexpression of HAN has an even stronger phenotype than a loss of function mutation, support the hypothesis that HAN may function as a key repressor that regulates floral development via intricate regulatory networks involving genes in the GATA3 family, hormone actions and floral organ specification. Time course induction experiment. Arabidopsis inflorescences containing flower buds from stages 1-9 were collected for microarray experiment 0h, 4h, 12h and 72h after 10M-BM-5M Dex treatment. RNA samples from mock- and Dex-treated plants at each time point were co-hybridized, and labeling dyes were swapped between replicates to reduce dye-related bias. Four biological replicates were used for the microarray hybridization.

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Analysis of the Arabidopsis shoot meristem transcriptome during floral transition identifies distinct regulatory patterns and an LRR protein that promotes flowering

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