A novel TF molecular switch-mechanism found in two contrasting ecotypes of a psammophyte, Agriophyllum squarrosum, in regulating transcriptional drought memory

被引:8
作者
Fang, Tingzhou [1 ,2 ]
Qian, Chaoju [1 ]
Daoura, Bachir Goudia [3 ]
Yan, Xia [4 ]
Fan, Xingke [1 ]
Zhao, Pengshu [1 ,2 ]
Liao, Yuqiu [1 ,2 ]
Shi, Liang [1 ,2 ]
Chang, Yuxiao [5 ]
Ma, Xiao-Fei [1 ]
机构
[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecol Safety & Sustainable Dev Arid Lands, Lanzhou 730000, Gansu, Peoples R China
[2] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
[3] Dan Dicko Dankoulodo Univ, Fac Sci & Technol, Dept Biol, POBox 465, Maradi, Niger
[4] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Lanzhou 730000, Gansu, Peoples R China
[5] Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Shenzhen 518000, Peoples R China
基金
中国国家自然科学基金;
关键词
Drought memory; Agriophyllum squarrosum; Molecular switch; Comparative transcriptomics; Psammophytes; Local adaptation; STRESS TOLERANCE; PLANT-RESPONSES; TREHALOSE; RESISTANCE; GROWTH; GENES; BIOSYNTHESIS; ACCUMULATION; GLUTATHIONE; EXPRESSION;
D O I
10.1186/s12870-023-04154-6
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
BackgroundPrior drought stress may change plants response patterns and subsequently increase their tolerance to the same condition, which can be referred to as "drought memory" and proved essential for plants well-being. However, the mechanism of transcriptional drought memory in psammophytes remains unclear. Agriophyllum squarrosum, a pioneer species on mobile dunes, is widely spread in Northern China's vast desert areas with outstanding ability of water use efficiency. Here we conducted dehydration-rehydration treatment on A. squarrosum semi-arid land ecotype AEX and arid land ecotype WW to dissect the drought memory mechanism of A. squarrosum, and to determine the discrepancy in drought memory of two contrasting ecotypes that had long adapted to water heterogeneity.ResultPhysiological traits monitoring unveiled the stronger ability and longer duration in drought memory of WW than that of AEX. A total of 1,642 and 1,339 drought memory genes (DMGs) were identified in ecotype AEX and WW, respectively. Furthermore, shared DMGs among A. squarrosum and the previously studied species depicted that drought memory commonalities in higher plants embraced pathways like primary and secondary metabolisms; while drought memory characteristics in A. squarrosum were mainly related to response to heat, high light intensity, hydrogen peroxide, and dehydration, which might be due to local adaptation to desert circumstances. Heat shock proteins (HSPs) occupied the center of the protein-protein interaction (PPI) network in drought memory transcription factors (TF), thus playing a key regulatory role in A. squarrosum drought memory. Co-expression analysis of drought memory TFs and DMGs uncovered a novel regulating module, whereby pairs of TFs might function as molecular switches in regulating DMG transforming between high and low expression levels, thus promoting drought memory reset.ConclusionBased on the co-expression analysis, protein-protein interaction prediction, and drought memory metabolic network construction, a novel regulatory module of transcriptional drought memory in A. squarrosum was hypothesized here, whereby recurrent drought signal is activated by primary TF switches, then amplified by secondary amplifiers, and thus regulates downstream complicated metabolic networks. The present research provided valuable molecular resources on plants' stress-resistance basis and shed light on drought memory in A. squarrosum.
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页数:18
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