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Arabidopsis thaliana

ABSTRACT: RNAseq analysis of raf18/20/24 and srk2abgh mutant under dehydration stress

PROVIDER: PRJDB8521 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	DRR184123.fastq.gz	Fastqsanger.gz
	DRR184124.fastq.gz	Fastqsanger.gz
	DRR184125.fastq.gz	Fastqsanger.gz
	DRR184126.fastq.gz	Fastqsanger.gz
	DRR184127.fastq.gz	Fastqsanger.gz

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Project description:Arabidopsis thaliana plants that have experienced an initial exposure to dehydration stress (“trained plants”) have an increased ability to maintain leaf relative water content (RWC) during subsequent stresses than plants experiencing the stress for the first time and transcription of selected dehydration response genes is altered during successive exposures to dehydration stress. This physiological and transcriptional behavior of trained plants is consistent with a “memory “of an earlier stress. It is unknown whether such memory is present in other Angiosperm lineages and whether it is an evolutionarily conserved response to stress. Here, we analyzed the behavior and transcriptomes of maize (Zea mays) plants experiencing multiple dehydration stresses and compare them with responses of the evolutionarily distant A. thaliana. We found structurally related genes in maize that displayed the same memory-type responses as in A. thaliana, providing evidence of the conservation of function and transcriptional memory in the evolution of plants’ dehydration stress response systems. Similar to A. thaliana, trained Z. mays plants retained higher RWC during dehydration stress than untrained plants, due in part to maintaining reduced stomatal conductance, despite full recovery of RWC, after the first stress. Divergent transcriptional memory responses were also expressed, suggesting diversification of function among stress memory genes. Some dehydration stress memory genes were also shared with other stress and hormone responding pathways, indicating complex and dynamic interactions between different plant signaling networks. The results provide new insight into how plants respond to multiple dehydration stresses and provide a platform for studies of the functions of memory genes in adaptive responses to water deficit in monocot and eudicot plants .

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Project description:To understand the role of SMAX1 and SMXL2 in water stress response, we have carried out comparative expression analysis of the smax1 smxl2 mutant and WT plants under dehydration and well-watered (control) conditions. Aligent's whole Arabidopsis Gene Expression Microarray (G2519F-021169, V4, 4x44K) was used.

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