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Littérature scientifique sur le sujet « VvCRF4 »

Auteur : Grafiati

Publié le 29 mars 2025

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Articles de revues sur le sujet "VvCRF4"

Shi, Wenjing, Michael Riemann, Sophie-Marie Rieger et Peter Nick. « Cold-Induced Nuclear Import of CBF4 Regulates Freezing Tolerance ». International Journal of Molecular Sciences 23, n^o 19 (27 septembre 2022) : 11417. http://dx.doi.org/10.3390/ijms231911417.

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C-repeat binding factors (CBFs) are crucial transcriptional activators in plant responses to low temperature. CBF4 differs in its slower, but more persistent regulation and its role in cold acclimation. Cold acclimation has accentuated relevance for tolerance to late spring frosts as they have become progressively more common, as a consequence of blurred seasonality in the context of global climate change. In the current study, we explore the functions of CBF4 from grapevine, VvCBF4. Overexpression of VvCBF4 fused to GFP in tobacco BY-2 cells confers cold tolerance. Furthermore, this protein shuttles from the cytoplasm to the nucleus in response to cold stress, associated with an accumulation of transcripts for other CBFs and the cold responsive gene, ERD10d. This response differs for chilling as compared to freezing and is regulated differently by upstream signalling involving oxidative burst, proteasome activity and jasmonate synthesis. The difference between chilling and freezing is also seen in the regulation of the CBF4 transcript in leaves from different grapevines differing in their cold tolerance. Therefore, we propose the quality of cold stress is transduced by different upstream signals regulating nuclear import and, thus, the transcriptional activation of grapevine CBF4.

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Aazami, Mohammad Ali, et Nasser Mahna. « Salicylic acid affects the expression of VvCBF4 gene in grapes subjected to low temperature ». Journal of Genetic Engineering and Biotechnology 15, n^o 1 (juin 2017) : 257–61. http://dx.doi.org/10.1016/j.jgeb.2017.01.005.

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Hu, Xiaoxuan, Chenyu Hao, Zong-Ming Cheng et Yan Zhong. « Genome-Wide Identification, Characterization, and Expression Analysis of the Grapevine Superoxide Dismutase (SOD) Family ». International Journal of Genomics 2019 (24 février 2019) : 1–13. http://dx.doi.org/10.1155/2019/7350414.

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Superoxide dismutase (SOD) is an essential enzyme of the plant antioxidant system that responds to oxidative damage caused by adverse conditions. However, little is known about the SOD gene family in Vitis vinifera (Vv). In the present study, ten SOD genes, including 6 copper/zinc SODs, 2 iron SODs, and 2 manganese SODs, were identified in the grapevine genome where they were unevenly distributed on 12 chromosomes. Ten VvSOD genes were divided into three main groups based on phylogenetic analysis, subcellular localization, and the distribution of conserved protein motifs. Additionally, many cis-elements related to different stresses were found in the promoters of the 10 VvSOD genes. Syntenic analysis revealed that VvMSD1 and VvMSD2 were derived from segmental duplication, and VvCSD4 and VvCSD5 belong to a pair of tandemly duplicated genes. Gene expression analysis based on microarray data showed that the 10 VvSOD genes were expressed in all the tested tissues. Interestingly, the segmentally duplicated gene pair (VvMSD1 and VvMSD2) exhibited differential expression patterns in various organs. In contrast, the tandemly duplicated gene pair (VvCSD4 and VvCSD5) displayed similar expression patterns in the tested organs. Our results provide a basis for further functional research on the SOD gene family in grapevine.

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Tillett, Richard L., Matthew D. Wheatley, Elizabeth A. R. Tattersall, Karen A. Schlauch, Grant R. Cramer et John C. Cushman. « The Vitis vinifera C-repeat binding protein 4 (VvCBF4) transcriptional factor enhances freezing tolerance in wine grape ». Plant Biotechnology Journal 10, n^o 1 (13 septembre 2011) : 105–24. http://dx.doi.org/10.1111/j.1467-7652.2011.00648.x.

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Li, Songqi, Xufei Li, Pengwei Jing, Min Li, Yadan Sun, Leilei Wang, Qiaofang Shi et Yihe Yu. « The Transcription Factor VvbHLH053 Regulates the Expression of Copper Homeostasis-Associated Genes VvCTr5/6 and VvFRO4 and Confers Root Development in Grapevine ». International Journal of Molecular Sciences 26, n^o 1 (26 décembre 2024) : 128. https://doi.org/10.3390/ijms26010128.

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Chlormequat chloride (CCC) has been demonstrated to inhibit plant growth and strengthen seedlings. The present study demonstrated that the root growth of Thompson seedless grapevine seedlings was significantly enhanced by the application of CCC treatment. Nevertheless, the precise mechanism by which CCC regulates plant root growth remains to be elucidated. Consequently, an RNA-sequencing (RNA-Seq) analysis was conducted on grapevine roots subjected to CCC treatment and those undergoing natural growth. A total of 819 differentially expressed genes were identified. Subsequently, Gene Ontology (GO) functional enrichment and weighted gene co-expression network analysis (WGCNA) identified the Copper (Cu) homeostasis-associated genes, VvCTr4/5/6/8 and VvFRO4, which play a pivotal role in mediating the effect of CCC. To further elucidate the transcription factor regulating these Cu homeostasis-associated genes, the key transcription factor VvbHLH053 was identified based on the PlantTFDB database, WGCNA results, and expression patterns under CCC treatment. Furthermore, multiple bHLH binding sites were identified on the promoters of VvCTr4/5/6 and VvFRO4. The GUS activity analysis and dual-luciferase assay demonstrated that VvbHLH053 can directly regulate the expression of VvCTr5/6 and VvFRO4. These findings reveal the feedback mechanism of grapevine root growth mediated by CCC and establish a direct functional relationship between CCC, VvbHLH053, and Cu homeostasis-associated genes that regulate root growth.

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Neba, Yasuhiko, Hirokazu Matsumoto, Ryozo Itoh et Kouichi Ishizaka. « VVCF AC-AC Converters Using Single Bridge Circuit ». IEEJ Transactions on Industry Applications 130, n^o 6 (2010) : 824–25. http://dx.doi.org/10.1541/ieejias.130.824.

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Neba, Yasuhiko, Hirokazu Matsumoto, Ryozo Itoh, Kouichi Ishizaka, Koichiro Hashimoto et Daiki Kaji. « VVCF Single-phase Current Source Converter using Single Bridge ». IEEJ Transactions on Industry Applications 132, n^o 3 (2012) : 452–53. http://dx.doi.org/10.1541/ieejias.132.452.

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Fu, Peining, Wenjie Wang, Lixia Hou et Xin Liu. « Hydrogen sulfide is involved in the chilling stress response in Vitis vinifera L. » Acta Societatis Botanicorum Poloniae 82, n^o 4 (2013) : 295–302. http://dx.doi.org/10.5586/asbp.2013.031.

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Hydrogen sulfide (H2S) is an important signaling molecule involved in several stress-resistance processes in plants, such as drought and heavy metal stresses. However, little is known about the roles of H2S in responses to chilling stress. In this paper, we demonstrated that chilling stress enhance the H2S levels, the H2S synthetase (L-/D-cysteine desulfhydrase, L/DCD) activities, and the expression of L/DCD gene in Vitis vinifera L. ‘F-242’. Furthermore, the seedlings were treated with sodium hydrosulﬁde (NaHS, a H2S donor) and hypotaurine (HT, a H2S scavenger) at 4°C to examine the effects of exogenous H2S on grape. The results revealed that the high activity of superoxide dismutase and enhanced expression of VvICE1 and VvCBF3 genes, but low level of super oxide anion radical, malondialdehyde content and cell membrane permeability were detected after addition of NaHS. In contrast, HT treatment displayed contrary effect under the chilling temperature. Taken together, these data suggested that H2S might be directly involved in the cold signal transduction pathway of grape.

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Deng, Chenglin, Chuanhai Deng, Han Wang, Jianying Zhong et Xinjing Cai. « Study on Two Residual Flux Suppression Strategies of Current Transformer During Automatic Reclosing ». Journal of Physics : Conference Series 2224, n^o 1 (1 avril 2022) : 012054. http://dx.doi.org/10.1088/1742-6596/2224/1/012054.

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Abstract After power system short-circuit fault occurs, there is a large amount of residual magnetism in current transformer core, which will lead to wrong operation of connected relay protection and affect its reliability. Based on the direct current method, this paper puts forward two kinds of current transformer residual flux suppression strategies, which are constant voltage variable frequency (CVVF) and variable voltage constant frequency (VVCF), the magnetic flux of the core is gradually reduced by controlling the polarity of the output voltage of the switch module. The principle of residual flux suppression is introduced, and the method of parameter selection is given. The suppression effect of two residual flux suppression strategy is simulated and analyzed by experiment simulation. The results show that the two residual flux suppression strategies can demagnetize the current transformer core during automatic reclosing, but the constant voltage CVVF residual flux suppression strategy is simpler and more efficient.

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Lu, Ying, Xiaojie Ji et Yu Shu. « Method to Correct the Velocity Variation Information of an Automatic Crash Notification System in Vehicle-to-Rigid Barrier Frontal Collisions ». Shock and Vibration 2021 (18 août 2021) : 1–18. http://dx.doi.org/10.1155/2021/5597886.

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Automatic crash notification systems (ACNSs) play a key role in post-accident safety. To improve the accuracy and efficiency of ACNSs, a method to correct the velocity variation information of ACNSs was established. First, after the acceleration data of sled crash tests were analysed, the factors affecting the accuracy of the velocity variation information were determined, and the influence of the discrimination threshold and acceleration curve shape on the velocity variation information was examined. Second, according to the acceleration data generated by the simulation model of a sled crash, the correlation between the accuracy of the velocity variation information and influencing factors was modelled. Third, an automatic crash notification algorithm involving a velocity variation correction function (VVCF) was proposed based on the correlation model. Finally, to verify its reliability, the improved algorithm was applied to an automatic crash notification system (ACNS) terminal. The validation results show that the ACNS terminal can accurately identify collisions and transmit accident information. Moreover, more accurate velocity variation information can be retrieved.

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Thèses sur le sujet "VvCRF4"

Prévot, Cécile. « Rôle du facteur de transcription VvCRF4 dans la thermotolérance de la vigne : caractérisation et réponse au stress thermique ». Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0412.

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Dans le contexte du changement climatique, comprendre les mécanismes d’adaptation de la vigne aux vagues de chaleur extrême, de plus en plus fréquentes, est essentiel pour préserver sa culture. L’identification de gènes clés impliqués dans la réponse au stress thermique est cruciale pour favoriser l’adaptation de la vigne et maintenir la qualité du raisin. Ces gènes peuvent également servir de marqueurs moléculaires pour sélectionner des variétés plus tolérantes à la chaleur. Parmi ces gènes, les facteurs de transcription occupent une place centrale dans la régulation des réponses au stress chaud, bien que leur caractérisation reste incomplète. Ce travail de thèse se concentre sur l’implication de VvCRF4, un facteur de transcription de la famille AP2-ERF, induit par la chaleur et jouant un rôle clé dans la thermotolérance de la vigne. Ainsi, grâce à des approches de transgénèse appliquées à la microvigne, nous avons démontré que la surexpression de VvCRF4 améliore significativement la thermotolérance. De plus, une combinaison d’analyses transcriptomiques, cistromiques et métabolomiques a permis d’identifier des gènes et des voies métaboliques associés à l’activation de VvCRF4 dans le contexte des températures élevées. Ces résultats contribuent à une meilleure compréhension des mécanismes moléculaires à l’œuvre dans la réponse de la vigne au stress chaud et ouvrent de nouvelles perspectives pour le développement de variétés de vigne plus résilientes face aux défis posés par le changement climatique
In the context of climate change, understanding the mechanisms by which vines adapt to the increasing frequency of heat waves is crucial for maintaining vine growth. Identifying key genes involved in the heat stress response is of paramount importance to promote grapevine adaptation and maintain grape quality. Such genes can also be used as molecular markers for breeding heat-tolerant varieties. Among these genes, transcription factors play a pivotal role in the regulation of heat stress responses, despite their incomplete characterization. The present thesis focuses on the involvement of VvCRF4, a transcription factor belonging to the AP2-ERF family, which is induced by high temperatures and plays a key role in grapevine thermotolerance. Using a transgenic approach in microvines, we demonstrated that VvCRF4 overexpression significantly improves thermotolerance. In addition, a combination of transcriptomic, cistromic and metabolomic approaches enabled the identification of genes and metabolic pathways associated with VvCRF4 activation under high temperatures. These findings contribute to a better understanding of the molecular mechanisms underlying grapevine's response to heat stress, and open up new prospects for developing more resilient grapevine varieties to face the challenges raised by climate change

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Chapitres de livres sur le sujet "VvCRF4"

Yamamura, Sakae. « AC power supply for motor control ». Dans Spiral Vector Theory of AC Circuits and Machines, 87–92. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198593799.003.0009.

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Abstract AC motor control is making rapid progress, mainly due to the advances in AC power supply. Formerly it was not easy to control AC voltage and current as vector quantities. In AC power supplies called variable-voltage constant-frequency (VVCF) or variable-voltage variable-frequency (VVVF), only one or two AC quantities are controlled. The control was a scalar control, and its application was mostly limited to AC motor speed control. Advancement of the semiconductor inverter has made it possible to control variables of the AC power supply as vector quantities. As a result, AC motor control has made remarkable progress. In the preceding chapters, the analysis and control theories of AC motors, which had been considerably lacking, have been treated and supplemented. Now AC power supply will be explained.

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Actes de conférences sur le sujet "VvCRF4"

Li Kai, Ch et Wang Yan. « Analysis of thyristor controlled induction motors based on VVCF ». Dans Proceedings of the Eighth International Conference on Electrical Machines and Systems. IEEE, 2005. http://dx.doi.org/10.1109/icems.2005.202496.

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