terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 The characterization of Vitis vinifera L cv. Cabernet sauvignon: the contribution of Ecklonia maxima seaweed extract

The characterization of Vitis vinifera L cv. Cabernet sauvignon: the contribution of Ecklonia maxima seaweed extract

Abstract

Biostimulants and biofertilizers are considered environmentally friendly and cost-effective alternatives to synthetic fertilizers, plant growth regulators and crop improvement products. Broadly, plant biostimulants are expected to improve nutrient use efficiency, tolerance to abiotic stress, quality traits and availability of nutrients in the soil or rhizosphere. Currently, seaweed extracts account for more than 33% of the total plant biostimulant market. Within this category, Ascophyllum nodosum (AN), is the most widely studied and applied in biostimulant formulations. In contrast, Ecklonia maxima (EM) species, is relatively under researched. In this study the effects of EM seaweed extract (Kelpak®) foliar spray applied: one week before flowering (EL- stage 18), at berry set (EL- stage 27) and at véraison (EL-stage 35) in combination with two different water-status scenarios (non-irrigated and irrigated) were investigated. The four treatments (CIR-, CIR+, EMIR- and EMIR+) were applied in ten min-experimental plots (consisting of 3 vines and 30 vines per treatment) in a commercial block of Vitis vinifera L. cv. Cabernet Sauvignon in the Stellenbosch wine region. The effects on grapevine physiology (gaseous exchange, photosynthesis rate, chlorophyll fluorescence, predawn and stem water potentials), vegetative characteristics, reproductive characteristics (yield components) and the subsequent grape berry and wine metabolites were studied during the 2021-2022 harvest season. Differences in oenological parameters (classical parameters and phenolic composition) were also investigated and compared. Regardless of water status scenario, EM application did not affect vine photosynthetic capacity. Leaf area was positively influenced by the EM foliar applications which resulted in improved sugars and organic acid concentration. Furthermore, the concentration of grape phenolics at harvest were positively influenced which was also evident in the bottled wines from grapes derived from EM treated grapevines. Overall, the data suggest that the use of EM based foliar products, could be beneficial in increasing grape metabolites during the ripening period and could be beneficial for sustainable viticulture.

DOI:

Publication date: October 10, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Liam Jay Samuels1*, Mathabatha Evodia Setati1 and Erna Hailey Blancquaert1

1Department of Viticulture and Oenology, South African Grape and Wine Research Institute (SAGWRI), Stellenbosch University, Private Bag X1, Matieland, Stellenbosch 7602, South Africa

Contact the author*

Keywords

grapevine, seaweed, biostimulants, sugars

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Preliminary study of the influence of ripening on the polysaccharide content of different red grape varieties

Grape skin has a barrier and protective function in grapes. Cell wall of grape skins is mainly composed of polysaccharides such as pectins, celulloses and hemicelluloses and structural proteins. Terroir, variety and changes during ripening can affect the content of polysaccharides in grapes. The aim of this study was to evaluate the content of polysaccharides (PS) in grapes along the ripening process. Three red grape varieties were studied: Garnacha (G), Tempranillo (T) and Prieto Picudo (PP).
Read More

Reconstructing ancient microbial fermentation genomes from the wine residues of Herod, Roman king of Judea

The fortress of the Herodium, built towards the end of the first century BCE/ante Cristo, on the orders of Herod the Great, Roman client king of Judea, attests the expansion of Roman influence in the eastern Mediterranean. During archaeological excavations of the Herodium in 2017[1], a winery was discovered on the ground floor of the palace, with an assortment of clay vessels in situ, including large dolia – clay fermentation vessels each capable of fermenting up to 300-400 L of wine. Thanks to the recent progresses in the field of paleogenomics[2], we could analyse the organic material consistent with grape pomace at the bottom of these vessels, by extracting and sequencing the DNA using shotgun metagenomics and targeted capture, aiming for enrichment of DNA from fermentation associated microbes.

Read More

Overall conceptual characterization of aged dry white wines using a mental descriptive questionnaire

The purpose of the present study was to understand the overall concept of an aged dry white wine using a descriptive mental questionnaire. A total of 680 worldwide participants, grouped according to their involvement in the wine business, replied to an online questionnaire to characterize the sensory analytical and synthetic descriptors of an aged dry white wine. The descriptors were selected using a Check-All-That-Apply (CATA) approach concerning wine colour, aroma, taste, mouthfeel, and global appreciation.

Read More

Metabolomic profiling of botrytized grape berries: unravelling the dynamic chemical transformations during noble rot

Botrytis cinerea, a fungal pathogen commonly known as grey mold, which under specific climatic conditions can develop into a desirable form known as noble rot. In this process the fungus penetrates the grape skin, allowing water evaporation and concentration of sugars and flavors, while profoundly affects the metabolite composition of grapes, leading to the production of unique and desirable compounds in the resulting wines. The result is a unique and complex wine with a luscious sweetness, heightened aromatics, and a distinct character.

Read More

Indicators of Sustainable Vineyard Soil Management: Metrics for Assessing Environmental Impacts

The vital role of soils in supporting life on our planet cannot be overstated. Soils provide numerous ecosystem services and functions, including biomass production, carbon sequestration, physical support, biological habitat, and genetic reserve, among others. Understanding the characteristics and sensitivity of soils in a specific terroir, along with effective soil management practices, is crucial for the sustainable management of natural resources.

Read More