terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Effects of long-term drought stress on soil microbial communities from a Syrah cultivar vineyard

Effects of long-term drought stress on soil microbial communities from a Syrah cultivar vineyard

Abstract

Changes in the rainfall and temperature patterns affect the increase of drought periods becoming one of the major constraints to assure agricultural and crop resilience in the Mediterranean regions. Beside the adaptation of agricultural practices, also the microbial compartment associated to plants should be considered in the crop management. It is known that the microbial community change according to several factors such as soil composition, agricultural management system, plant variety and rootstock. Considering the increasing pressure of the biotic and abiotic stresses, it is utmost necessary to also evaluate the effects of drought on the microbiome associated to grapevine in a sensitive Mediterranean region (Alentejo – Portugal).

In this study we characterize the diversity and the structure of the soil microbial community of the drought tolerant Syrah cultivar under long-term irrigation experiment (five years) with three levels (100% ETc – FI; 50% ETc – DI; rain-fed – NI). Metabarcoding of bacteria (16S rRNA subregion) and fungi (ITS region) was applied on the same soil samples. Also soil chemical analysis are being integrated with genomic data.

Although the richness and evenness indexes for alpha diversity did not show strong differences among the irrigation strategies for neither of the targeted microorganisms, beta diversity revealed statistically supported community differentiation. Across all samples the top three bacterial phyla were Pseudomonadota, Actinobacteriota, and Bacteroidota with a total relative abundance of 60%. Regarding the most represented bacterial species across samples, Gaiella occulta, an uncultured actinobacteria first described in deep mineral waters in Portugal, is shown with prevalence in DI samples with more than 10% of total ASVs.

Next, we will predict communities functionalities, bacterial networks, according to soil chemistry data and compare them with the soils’ samples obtained in July 2023.

DOI:

Publication date: October 11, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Gianmaria Califano1,2*, Júlio Maciel1, Olfa Zarrouk3,4, Miguel Damásio5, Jose Silvestre5, Ana Margarida Fortes1,2

1Faculdade de Ciências, University of Lisbon, Portugal
2BioISI, Faculdade de Ciências, University of Lisbon, Portugal
3LEAF – Linking Landscape, Environment, Agriculture and Food Research Centre, Associate Laboratory TERRA, ISA-ULisboa, Lisboa, Portugal
4COLAB, Torres Vedras, Portugal
5INIAV, Polo de Dois Portos, Portugal

Contact the author*

Keywords

soil microbiome, metabarcoding, grapevine, Syrah, drought, crop sustainability

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

The use of δ13C as an indicator of water use efficiency for the selection of drought tolerant grapevine varieties

In the context of climate change with increasing evaporative demand, understanding the water use behavior of different grapevine cultivars is of critical importance. Carbon isotope discrimination (δ13C) measurements in wine provide a precise and integrated assessment of the water status of the vines during the sugar accumulation period in grape berries. When collected over multiple vintages on different cultivars, δ13C measurements can also provide insights into the effects of genotype on water use efficiency.

Read More

Extreme vintages affect grape varieties differently: a case study from a cool climate wine region

Eger wine region is located on the northern border of grapevine cultivation zone. In the cool climate, terroir selection is one of the foundations of quality wine making. However, climate change will have a significant impact on these high value-added vineyards. This study presents a case study from 2021 and 2022 with the investigation of three grape varieties (Kadarka, Syrah, Furmint). The experiment was conducted in a steep-sloped vineyard (Nagy-Eged hill) with a southern exposure.

Read More

Addition of glutathione-rich inactivated yeasts to white musts: effects on wine composition and sensory quality

Glutathione plays a key role in preventing some oxidative processes during winemaking. This molecule limits the must enzymatic oxidation, reacts with caffeic acid and generates a colourless compound that prevents subsequent browning. It also has a protective effect on wine aroma, preventing the oxidation of the volatile compounds with a high sensory impact.

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

The 1000 grapevine genomes project: Cataloguing Australia’s grapevine germplasm

Grapevine cultivars can be unequivocally typed by both physical differences (ampelography) and genetic tests. However due to their very similar characteristics, the identification of clones within a cultivar relies on the accurate tracing of supply records to the point of origin. Such records are not always available or reliable, particularly for older accessions. Whole genome sequencing (WGS) provides the most highly detailed methodology for defining grapevine cultivars and more importantly, this can be extended to differentiating clones within those cultivars.

Read More