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Time-course analysis and transcriptomic identification of a groupⅢ ERF CmTINY2 involved in waterlogging tolerance in chrysanthemums

ABSTRACT: ‘Hangju’ is a variety of Chrysanthemum morifolium Ramat with both aesthetic and medicinal value, cultivated as traditional Chinese medicine for four centuries. The cultivation of ‘Hangju’ faces a significant challenge due to waterlogging stress, resulting in a considerable decrease in crop yield. Nevertheless, there is a scarcity of studies exploring the underlying mechanisms of waterlogging tolerance in ‘Hangju’. This investigation focused on comparing the characteristics of the waterlogging-tolerant variety EWT and the waterlogging-sensitive variety CK of ‘Hangju’. The study revealed that EWT exhibited a more advanced aeration tissue structure and demonstrated rapid development of adventitious roots following waterlogging. Through a time-course transcriptome analysis, it was observed that EWT could swiftly adjust the expression of genes involved in energy metabolism signaling pathways to acclimate to the waterlogged environment. WGCNA analysis identified INTEGRASE-TYPE DNA-BINDING PROTEIN (CmTINY2) as a key factor in regulating waterlogging tolerance in EWT. CmTINY2, a transcription factor belonging to the ethylene responsive factor (ERF) subfamily III, operated within the nucleus and activated downstream gene expression. Its role in enhancing waterlogging tolerance might be linked to the control of stomatal aperture. In summary, this research has elucidated that the waterlogging tolerance exhibited by EWT chrysanthemum is a result of a combination of morphological structure and molecular regulatory mechanisms. Furthermore, the discovery of a waterlogging-tolerant gene from the ERF subfamily III has broadened our understanding of the role of ERF genes in waterlogging signaling pathways.

ORGANISM(S): Chrysanthemum x morifolium

PROVIDER: GSE269106 | GEO | 2024/06/11

REPOSITORIES: GEO

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Project description:Global gene expression was compared between roots of cotton plants (variety Sicot 71) flooded for 4 hours and roots of unflooded cotton plants. Global gene expression was also compared between leaves of cotton plants (variety Sicot 71) flooded for 24 hours and leaves of unflooded cotton plants. Waterlogging stress causes yield reductions in cotton (Gossypium hirsutum L.). A major component of waterlogging stress is the lack of oxygen available to submerged tissues. While changes in expressed protein, gene transcription and metabolite levels have been studied in response to low oxygen stress, little research has been done on molecular responses to waterlogging in cotton. We assessed cotton growth responses to waterlogging and assayed global gene transcription responses in root and leaf cotton tissues of partially submerged plants. Waterlogging causes significant reductions in stem elongation, shoot mass, root mass, and leaf number. At the global gene expression level waterlogging significantly alters the expression of 1012 genes (4.2% of genes assayed) in root tissue as early as 4h after flooding. Many of these genes are associated with cell wall modification and growth pathways, glycolysis, fermentation, mitochondrial electron transport and nitrogen metabolism. Waterlogging of plant roots also altered global leaf gene expression, significantly changing the expression of 1305 genes (5.4% of genes assayed) after 24h of flooding. Genes associated with cell wall growth and modification, tetrapyrrole synthesis, hormone response, starch metabolism and nitrogen metabolism were affected in leaf tissues of waterlogged plants. Implications of these results for the development of waterlogging tolerant cotton are discussed. Keywords: Stress Response Plants of cotton cultivar Sicot 71 were grown to the two-leaf stage in tubs. For stress treatments plants were either watered as normal or flooded with water to completely submerge the root system. At four and twenty-four hours post-flooding samples of root or leaf tissue were taken from control and flooded plants. Total RNA was extracted from each tissue sample and assayed on cotton Affymetrix chips. Two biological replications were used for each comparison.

Project description:Background: Waterlogging was one of the most serious abiotic stresses in wheat-growing regions of China. There were great differences in waterlogging tolerance among different wheat varieties, and the mechanism of waterlogging tolerance of wheat seeds during germination was unclear. Methods: In order to reveal the adaptability of wheat to waterlogging stress during germination, we analyzed the germination rate and anatomical structure of three wheat seeds, ‘Zhoumai 22’, ‘Bainong 207’ and ‘Bainong 607’. At the same time, Illumina sequencing technology was used to determine the transcriptome of these three wheat varieties during germination. Results: The results showed that there was no significant difference between the germination rate of ‘Bainong 207’ after 3 days of waterlogging treatment and that of the control seeds. However, under waterlogging stress, the degree of emulsification and degradation of endosperm cells was higher than that of the control treatment, and starch granules in endosperm were significantly reduced. Transcriptome data were obtained from seed samples (a total of 18 samples) of three wheat varieties under waterlogging and control treatment. A total of 2,775 differentially expressed genes (DEGs) were identified by comprehensive analysis. In addition, by analyzing the correlation between the expression levels of DEGs and seed germination rates in three wheat varieties under waterlogging stress, it was found that the relative expression levels of 563 and 398 genes were positively and negatively correlated with the germination rate of wheat seeds, respectively. The GO and KEGG analysis found that the difference in waterlogging tolerance of the three wheat varieties was related to the abundance of key genes involved in the glycolysis pathway, the starch and sucrose metabolism pathway, and the lactose metabolism pathway. The ethanol dehydrogenase (ADH) gene in the endosperm of ‘Bainong 607’ was immediately induced after a short period of waterlogging, and the energy provided by glycolysis pathway enabled the seeds of ‘Bainong 607’ to germinate as early as possible, while the expression level of AP2/ERF transcription factor was up-regulated to further enhance its waterlogging tolerance. Conclusions: In general, this study provided a deeper understanding of the mechanisms by which different wheat varieties respond to waterlogging stress during germination.

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Time-course analysis and transcriptomic identification of a groupⅢ ERF CmTINY2 involved in waterlogging tolerance in chrysanthemums

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