Role of ZmCCT in drought tolerance of maize by transcriptome and DAP-seq experiments
Ontology highlight
ABSTRACT:
ORGANISM(S): Zea mays
PROVIDER: GSE240962 | GEO | 2023/08/16
REPOSITORIES: GEO
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Project description:Abscisic acid (ABA)-, stress-, and ripening-induced (ASR) proteins are involved in abiotic stress responses. However, the exact molecular mechanism underlying their function remains unclear. Notably, the direct targets of ASRs that confer drought stress tolerance have not yet been identified.In this study, we report that MaASR expression was induced by drought stress and MaASR overexpression in Arabidopsis strongly enhanced drought stress tolerance. Physiological analyses indicated that transgenic lines had higher survival rates, germination rates and proline content, and lower water loss rates (WLR) and malondialdehyde (MDA) content. MaASR-overexpressing lines also showed smaller leaves and reduced sensitivity to ABA. Further, microarray and chromatin immunoprecipitation-based sequencing (ChIP-seq) analysis revealed that MaASR participates in regulating photosynthesis, respiration, carbohydrate and phytohormone metabolism and signal transduction to confer plants with enhanced drought stress tolerance. Direct interactions of MaASR with promoters for the hexose transporter and Rho GTPase-activating protein (RhoGAP) genes were confirmed by electrophoresis mobility shift array (EMSA) analysis. Our results indicate that MaASR acts as a crucial regulator of photosynthesis, respiration, carbohydrate and phytohormone metabolism and signal transduction to mediate drought stress tolerance.
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Project description:Plants physiological mechanisms are affected by Abscisic acid (ABA) via changing gene expression and empowers plants to adapt in numerous environments. Plants have evolved their protection mechanisms for seed germination and abiotic environments to deal with critical harsh conditions. Here, we have explored those changes in Arabidopsis thaliana plants subjected to multiple abiotic stresses. AtBro1 transcripts showed up-regulation in the presence of salt, ABA and mannitol stress conditions. AtBRO1 over-expression lines exhibited robust tolerance to drought and salt stress. Further, ABA elicits resistance responses in loss-of-function bro1-1 mutant plants and AtBro1 positively regulates drought resistance in Arabidopsis. Promoter of AtBro1 fused with GUS showed GUS expression mainly in the rosette leaves and floral clusters, especially in anthers. AtBro1 protein was found to be localized in the plasma membrane of Arabidopsis at the subcellular level by using AtBro1::GFP fusion. Using a broad RNA-sequencing analysis, we observed that early transcriptional responses prompted by ABA induction exhibit specific quantitative differences at different time points, suggesting that ABA stimulates resistance responses in bro1-1 mutant plants. Additionally, transcripts levels of MOP9.5, MRD1, HEI10, and MIOX4 were altered in loss-of-function mutant plants which are involved in different stress conditions. Collectively, our results have shown that AtBro1 is involved in a significant role by regulating plant transcriptional response to ABA and induction of resistance response against abiotic stress.
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2014-08-09 | E-GEOD-60260 | biostudies-arrayexpress
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2018-12-25 | GSE124340 | GEO
Project description:Purine catabolism is regarded as a housekeeping function that remobilizes nitrogen for plant growth and development. However, emerging evidence suggests that certain purine metabolites might contribute to stress protection of plants. Here, we show that in Arabidopsis, the intermediary metabolite allantoin plays a role in abiotic stress tolerance via activation of abscisic acid (ABA) metabolism. The aln loss-of-function of ALN, encoding allantoinase, results in increased allantoin accumulation, genome-wide up-regulation of stress-related genes, and enhanced tolerance to drought-shock and osmotic stress in aln mutant seedlings. This phenotype is not caused by a general response to purine catabolism inhibition, but rather results from a specific effect of allantoin. Allantoin activates ABA production both through increased transcription of NCED3, encoding a key enzyme in ABA biosynthesis, and through post-translational activation via high-molecular-weight complex formation of BG1, a ß-glucosidase hydrolyzing glucose-conjugated ABA. Exogenous application of allantoin to wild-type plants also activates the two ABA-producing pathways that lead to ABA accumulation and stress-responsive gene expression, but this effect is abrogated in ABA-deficient and BG1-knockout mutants. We propose that purine catabolism functions not only in nitrogen metabolism, but also in stress tolerance by influencing ABA production, which is mediated by the possible regulatory action of allantoin. Compared analysis of the transcriptomes of 2-week-old Arabidopsis seedlings from an allantoin-accumulating mutant genotype versus wild type background Col-0 (2 independent biological replicates per genotype). The allantoin-accumulating mutant in Col-0 background was the aln-1 mutant allele in allantoinase (ALN) (abbreviated as aln).
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