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…

High-throughput sequencing analysis based on nematode indices revealed healthier soils of organic vineyards 

Proper soil health assessments are crucial for sustainable cropland. Among the widely employed approaches, evaluating nematode community structure is particularly suitable. Traditionally, the taxonomic characterization of soil nematodes has relied on time-consuming morphology-based methods requiring experienced experts. However, molecular tools like high-throughput sequencing have emerged as efficient alternatives. In this study, we performed a metataxonomic analysis of soil samples collected from 57 vineyards in the DOCa Rioja region of Northern Spain, focusing on the impact of organic viticulture and cover cropping compared to integrated pest management (IPM) and tilling practices.
Read More

Exploring relationships among grapevine chemical and physiological parameters and mycobiome composition under drought stress

Improving our knowledge on biotic and abiotic factors that influence the composition of the grapevine mycobiome is of great agricultural significance, due to potential effects on plant health, productivity, and wine characteristics. Among the various environmental factors affecting the morphological, physiological, biochemical and molecular attributes of grapevine, drought stress is one of the most severe, becoming increasingly an issue worldwide.

Read More

The tolerance of grapevine rootstocks to water deficit is related to root morphology and xylem anatomy traits 

Climate change is altering water balances, thereby compromising water availability for crops. In grapevine, the strategic selection of genotypes more tolerant to soil water deficit can improve the resilience of the vineyard under this scenario. Previous studies demonstrated that root anatomical and morphological traits determine vine performance under water deficit conditions. Therefore, 13 ungrafted rootstock genotypes, 6 commercial (420 A, 41 B, Evex 13-5, Fercal, 140 Ru y 110 R), and 7 from new breeding programs (RG2, RG3, RG4, RG7, RG8, RG9 and RM2) were evaluated in pots during 2021 and 2022.

Read More

Organic mulches slightly influence wine phenolic composition and sensorial properties

Grapevines have traditionally been grown in semi-arid areas, but viticulture is now compromised by climate change. Therefore, it is necessary to implement environmentally friendly viticulture practices to adapt grapevines to current climatic conditions. In this context, organic mulches offer many benefits, such as reduced soil erosion and increased organic matter, soil water content and crop productivity. However, these practices must not compromise grape and wine quality. Therefore, the objective of this study was to evaluate the effect on wine physicochemical and phenolic composition and sensorial properties of different soil management practices on the vine row. Over four years, five soil treatments were examined in two different vineyards.

Read More

Applicability of spectrofluorometry and voltammetry in combination with machine learning approaches for authentication of DOCa Rioja Tempranillo wines

The main objective of the work was to develop a simple, robust and selective analytical tool that allows predicting the authenticity of Tempranillo wines from DOCa Rioja. The techniques of voltammetry and absorbance-transmission and fluorescence excitation emission matrix (A-TEEM) spectroscopy have been applied in combination with machine learning (ML) algorithms to classify red wines from DOCa Rioja according to region (Alavesa, Alta or Oriental) and category (young, crianza or reserva).

Read More