The molecular mechanism regulating dormancy release in grapevine buds is as yet unclear. It was formerly proposed that dormancy is maintained by abscisic acid (ABA)-mediated repression of bud-meristem activity and that removal of this repression triggers dormancy release. It was also proposed that such removal of repression may be achieved via natural or artificial up-regulation of VvA8H-CYP707A4, which encodes ABA 8'-hydroxylase, and is the most highly expressed paralog in grapevine buds. The current study further examines these assumptions, and its experiments reveal that (a) hypoxia and ethylene, stimuli of bud dormancy release, enhance expression of VvA8H-CYP707A4 within grape buds, (b) the VvA8H-CYP707A4 protein accumulates during the natural transition to the dormancy release stage, and (c) transgenic vines overexpressing VvA8H-CYP707A4 exhibit increased ABA catabolism and significant enhancement of bud break in controlled and natural environments and longer basal summer laterals. The results suggest that VvA8H-CYP707A4 functions as an ABA degrading enzyme, and are consistent with a model in which the VvA8H-CYP707A4 level in the bud is up-regulated by natural and artificial bud break stimuli, which leads to increased ABA degradation capacity, removal of endogenous ABA-mediated repression, and enhanced regrowth. Interestingly, it also hints at sharing of regulatory steps between latent and lateral bud outgrowth.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/pce.13371 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Recent progress in proteins regulating the germination of spores.
J Bacteriol
January 2025
College of Food Science and Nutritional Engineering, National Engineering Research Center for Fruit and Vegetable Processing, Key Laboratory of Fruit and Vegetable Processing of Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory for Food Non-Thermal Processing, China Agricultural University, Beijing, China.
Bacterial spores can remain dormant for years, but they maintain the ability to recommence life through a process termed germination. Although spore germination has been reviewed many times, recent work has provided novel conceptual and molecular understandings of this important process. By using as a model organism, here we thoroughly describe the signal transduction pathway and events that lead to spore germination, incorporating the latest findings on transcription and translation that are likely detected during germination.
View Article and Find Full Text PDFPmRGL2/PmFRL3-PmSVP Module Regulates Flowering Time in Japanese apricot (Prunus mume Sieb. et Zucc.).
Plant Cell Environ
January 2025
Laboratory of Fruit Tree Biotechnology, College of Horticulture, Nanjing Agricultural University, Nanjing, China.
Article Synopsis
- The study focuses on the role of the DELLA protein PmRGL2 in regulating dormancy and flowering in Prunus mume, a type of temperate fruit tree.
- Genetic and protein interaction analyses revealed that PmRGL2 interacts with PmFRL3, influencing the expression of flowering-related proteins like PmSVP and PmSVP-like.
- The proposed mechanism suggests that environmental signals like gibberellin (GA) and chilling temperatures affect the PmRGL2/PmFRL3 complex, leading to changes in flowering timing by regulating PmSVP and PmSVP-like activity.
Transcriptome Analysis Provides Insights into the Safe Overwintering of Local Peach Flower Buds.
Curr Issues Mol Biol
December 2024
Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Anning, Lanzhou 730070, China.
During the dormant period of peach trees in winter, flower buds exhibit weak cold resistance and are susceptible to freezing at low temperatures. Understanding the physiological and molecular mechanisms underlying the response of local peach buds to low-temperature adversity is crucial for ensuring normal flowering, fruiting, and yield. In this study, the experimental materials included the conventional cultivar 'Xia cui' (XC) and the cold-resistant local resources 'Ding jiaba' (DJB) peach buds.
View Article and Find Full Text PDFFire and seed dormancy: A global meta-analysis.
Ann Bot
December 2024
Department of Agronomy, University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
Background And Aims: Fire-released seed dormancy (SD) is a key trait for successful germination and plant persistence in many fire-prone ecosystems. Many local studies have shown that fire-released SD depends on heat and exposure time, dose of smoke-derived compounds, SD class, plant lineage and the fire regime. However, a global quantitative analysis of fire-released SD is lacking.
View Article and Find Full Text PDFBone metastasis in endocrine-related cancer: unravelling invasion and destruction.
Endocr Relat Cancer
December 2024
M Maugham-Macan, Biomedical Science, University of the Sunshine Coast, Sippy Downs, Australia.
Bone is a common and debilitating site for metastatic cancer cell expansion. Skeletal metastasis is a multistage process, with primary stages of circulating tumour cells, progressing to a dormant state in vasculature and bone marrow niches, followed by tumorigenic reactivation, proliferation, and finally bone destruction. The frequency of bone metastasis is reconciled in Paget's "seed and soil" hypothesis, where a conducive microenvironment (bone niche) is essential for cancer cell colonisation.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!