terclim by ICS banner
IVES 9 IVES Conference Series 9 Freeze-thaw temperature oscillations promote increased differential gene expression during grapevine bud dormancy

Freeze-thaw temperature oscillations promote increased differential gene expression during grapevine bud dormancy

Abstract

In northern cold climate conditions, chilling requirement fulfillment in dormant grapevine buds is slowed or stopped by subzero temperatures impacting the transcriptional processes needed to complete chilling requirement. Cabernet Franc and Reisling in Geneva, NY were used to determine the impact of natural oscillating temperatures on grapevine bud transcriptional activity during light and dark periods of a two-week period in January with fluctuating diurnal winter temperatures. Cabernet Franc and Reisling bud samples were collected at 32 time points during the natural vineyard temperature cycle at 6:00 (dark), 14:00 (light) and 18:00 (dark) hours) to monitor gene expression in consecutive freezing and non-freezing temperature oscillations. Genotype, light and dark, and temperature oscillations conditions were explored. Four distinct conditions were analyzed 1) genotype difference with constant light/dark temperature conditions; 2) light vs dark with similar temperature conditions; 3) buds in light (14:00) at >0C vs <0C; 4) buds in dark (6:00 or 18:00) at >0C vs <0C; 4). Principal components analysis indicated that genotype accounted for 66% of variance and there were 1,916 and 1,559 differentially expressed genes (DEG) up and down regulated respectively, in Reisling relative to Cabernet Franc. A greater number of DEG were identified for light relative to dark samples (14:00 vs 6:00 or 18:00) and samples collected at temperatures >0C vs <0C. Gene pathway analysis showed significant positive enrichment in hormone signaling and secondary metabolite pathways in both genotypes in the >0C relative <0C temperature conditions indicating transient temperature changes enhance the metabolic activity of dormant buds.

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster

Authors

Prakriti Sharma1, Jason P. Londo2, Anne Fennell1

1 South Dakota State University, Brookings, SD, USA
2 Cornell University, Geneva, NY, USA

Contact the author*

Keywords

bud dormancy, freeze, chilling fulfilment

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Spatial determination of areas in the Western Balkans region favorable for organic production

In problematic conditions for production of grapes and wine caused by the COVID-19 pandemic and the resulting occurrence of wine surpluses, producers are increasingly turning to the innovative viticulture and winemaking of products that are more appealing to the market and the consumers. On the other hand, consumption of the food safety or organic products, and therefore of organic grapes and wine, is increasingly common in the world, in particular in Europe. The Regional Rural Development Standing Working Group (SWG RRD), as a regional intergovernmental organization gathers actors in the viticulture and winemaking sector from states and territories of the Western Balkans (South-East Europe) in the Expert Working Group for Wine, with the aim of improving viticulture and winemaking in this region through joint activities. In accordance with the aforementioned, the SWG RRD is working on advancing organic production of grapes and wine, and on recognition of specificities of the terroir of wine-growing areas in Western Balkans. In addition, as part of the project “Facilitation of Exchange and Advice on Wine Regulations in Western Balkan Countries” helmed by the German Federal Ministry of Food and Agriculture, in addition to harmonization of relevant legislation with EU regulations, efforts are being invested towards recognition of organic wines. Within activities and project implemented by this organization, expert analyses and scientific research of the terroir of Western Balkans were carried out, and some of the results are presented in this paper.

Identification of riboflavin low producer yeasts to prevent the light-struck taste in white wines

Wine quality maintenance during the storage is a fundamental aspect for both wine producers and consumers. Nowadays, great attention has been given to the light effect

Viticultural practices: past, present and future

Practices in viticulture have greatly evolved in the last five decades. There were three objectives: improvement in the quality of the products, reduction in the production costs through mechanization

A generic method to analyze vine water deficit continuously

In the context of global warming, water scarcity is becoming an increasing issue worldwide. However, the reference method to characterize vine water deficit is based on water potential measurement, which is a destructive and discontinuous method. The current climatic context emphasizes the need for more precise and more continuous vineyard water use measurements in order to optimize irrigation and vine water deficit monitoring.

Characterization and biological effects of extracts from winery by-products

Pomace, stem, grapevine leaves, and vine shoots arise as so called winery by-products during the wine production process.