Ontology highlight
ABSTRACT:
PROVIDER: PRJNA560377 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR9972870_1.fastq.gz | Fastqsanger.gz | |||
| SRR9972870_2.fastq.gz | Fastqsanger.gz | |||
| SRR9972880_1.fastq.gz | Fastqsanger.gz | |||
| SRR9972880_2.fastq.gz | Fastqsanger.gz | |||
| SRR9972871_1.fastq.gz | Fastqsanger.gz |
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Project description:To gain insights into molecular mechanisms of tolerance to heat stress, we conducted a transcript profiling experiment to identify heat-responsive genes in contrasting peanut mini core accessions, either un-acclimated or acclimated to heat stress. Plants at reproductive stage were exposed to 28 °C (control), 45 °C for 15 d (un-acclimated) or 45 °C for 1 d followed by 7 d recovery and 15 d stress (acclimated). Two contrasting genotypes showing diverse response to stress were selected based on a bioassay involving chlorophyll fluorescence yield under elevated respiratory demand and membrane thermostability. Transcript profiling was performed using 8 x 15k custom oligo microarrays containing 15k peanut EST sequences. Gene enrichment analysis was performed using Blast2GO program and genes with homology to known proteins were categorized into detailed molecular functional groups. Majority of stress-responsive genes assigned to KEGG pathways belonged to starch, sucrose and galactose metabolism followed by aminoacid metabolism, and secondary metabolite biosynthesis. Differentially expressed transcripts from samples were validated in the samples from second year by quantitative real-time PCR. Transcripts of eight genes involved in terpenoid and flavanoid biosynthesis were induced after second and seventh day, respectively in leaves under heat stress. Metabolite analysis confirmed increases in metabolites of selected pathways under heat stress. The heat up-regulated genes in tolerant COC041 mini-core accession are potential candidate genes for engineering stress-tolerant peanuts and unraveling molecular mechanisms of peanut adaptation to heat stress.
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Project description:Drought and heat are major abiotic stresses frequently coinciding to threaten rice production. Although hundreds of stress-related genes have been identified in the past two decades, very few genes have been confirmed to confer resistance to multiple stresses in crops. Here we report ONAC023, identified through NAC-centered gene regulatory network and genetic association analyses, is a hub stress-regulator that integrates the regulations of both drought and heat tolerance in rice. The loss-of-function mutant of ONAC023 showed significantly increased sensitivity to drought and heat stresses, whereas the overexpression of ONAC023 confers drought and heat tolerance at both seedling and reproductive stages. Notably, drought and heat stresses activated the function of ONAC023 not only by the induction of ONAC023 transcript but also by the nuclear accumulation of ONAC023 protein through a remorin-importin-α-assisted translocation. Under drought or heat stress, ONAC023 can directly target and promote the expression of functionally diverse downstream genes, such as OsPIP2;7, PGL3, OsFKBP20-1b, and OsSF3B1, which are involved in various stress-responsive processes including water transport, reactive oxygen species homeostasis, and alternative splicing (AS). Furthermore, genome-wide AS profiling revealed that the loss of ONAC023 function led to alternation of the encoding outcomes of thousands of AS transcripts under drought and heat stresses. These results manifested that ONAC023 is fine tuned to positively regulate drought and heat tolerance through the integration of multiple stress-responsive processes. Our findings provide not only an underlying connection between drought and heat responses, but also a promising candidate for engineering multi-stress-resilient rice.
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