terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Effect of biological control agents on grapevine rhizosphere microbiome and grapevine defenses

Effect of biological control agents on grapevine rhizosphere microbiome and grapevine defenses

Abstract

Plant diseases are a major obstacle to crop production. The main approaches to battle plant diseases, consist of synthetic chemicals to attack infecting pathogens. However, concerns are increasing about the effects of chemicals in the environment, leading to an increase in the use of biocontrol agents (BCAs), due to their assets, such as, antagonism, and competition. In this study, we tested the hypothesis that the introduction of Bacillus subtilis PTA-271 (Bs PTA-271) and Trichoderma atroviride SC1 (Ta SC1) produce distinctive modifications in the composition and network structure of the grapevine rhizosphere microbial community, as well as grapevine induced defenses. Therefore, we tested the effect of Ta SC1and Bs PTA-271, on grapevine rhizosphere bacterial and fungal microbiome, and plant gene expression, in two different soil types (clay and sandy soil). Additionally, we specifically quantified Ta SC1 and Bs PTA-271 in rhizosphere of both soil types. To do that, we used novel molecular approaches, such as high-throughput amplicon sequencing (HTAS), droplet digital PCR (ddPCR) and real-time PCR (qPCR). The results suggest that Bs PTA-271 established better in clay soil, where although its quantity was low at 30dpi, it was maintained at 90dpi. In contrast, Ta SC1 established better in sandy soil, with a lower quantity, that increased overtime. Regarding the BCAs impact on rhizosphere microbiome, bacterial diversity was not affected by any BCA application. However, inoculations with Ta SC1 significantly reduced fungal diversity. Ta SC1 applications affected the relationships between microorganisms, however this effect was clearer in clay soil. According to the selected plant defense markers, plants living in sandy soil appeared more impacted to BCA inoculation. Ta SC1 plants treated in sandy soil demonstrated a strong suppression defense genes 24hpi, that conversed in strong simulated defenses 4dpi, with a significant overexpression of PAL and STS. On the other hand, in clay soil, BCA-treated plants showed a slight increase in the expression of plant defense genes 24hpi, that intensifies 4dpi. In conclusion, the effect of Bs PTA-271 and Ta SC1 in grapevine rhizosphere appears to be soil-dependent, where a sandy soil favors the fungal BCA (Ta SC1) establishment, while a clay soil favors the bacterial BCA (Bs PTA-271) establishment.

DOI:

Publication date: October 4, 2023

Issue: ICGWS 2023

Type: Article

Authors

Catarina Leal1, Rebeca Bujanda1, Josep Armengol2, Patricia Trotel-Aziz3, Florence Fontaine3, Ales Eichmeier4, David Gramaje1

1Instituto de Ciencias de la Vid y del Vino (ICVV), Consejo Superior de Investigaciones Científicas – Universidad de la Rioja – Gobierno de La Rioja, Ctra. LO-20 Salida 13, Finca La Grajera, 26071 Logroño, Spain
2Instituto Agroflorestal Mediterráneo, Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, Spain
3University of Reims Champagne-Ardenne, Résistance Induite et Bioprotection des Plantes Research Unit, EA 4707, INRAE USC 1488, SFR Condorcet FR CNRS 3417, Reims, France
4Mendeleum—Institute of Genetics, Mendel University in Brno, Valticka 334, 691 44 Lednice, Czech Republic

Contact the author*

Keywords

Bacillus spp., biocontrol, ddPCR, grapevine, microbiome, next generation sequencing, rhizosphere, Trichoderma spp.

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

New tool to evaluate color modifications during oxygen consumption in white and red wines

Measuring the effect of oxygen consumption on the color of wines as the level of dissolved oxygen decreases over time is very useful to know how much oxygen a wine can consume without significantly altering its color. The changes produced in wine after being exposed to high oxygen concentrations have been studied by different authors, but in all cases the wine has been analyzed once the oxygen consumption process has been completed. This work presents the results obtained with the use of an equipment designed and made to measure simultaneously the level of dissolved oxygen and the spectrum of the wine, during the oxygen consumption process from saturation levels with air to very low levels, which indicate the total consumption of the dosed oxygen[1,2].

Read More

Development and validation of a free solvent UHPLC/MS-MS method to analyse melatonin and its precursors in Spanish commercial wines  

Melatonin is a bioactive compound present in foods and beverages such as wines. During alcoholic fermentation, yeast transforms tryptophan into certain indole compounds, including melatonin. This paper aims to develop and validate a free solvent analytical method by ultra-high performance liquid chromatography coupled with high resolution mass spectrometry (UHPLC/MS-MS) to determine melatonin and its precursors (L-tryptophan, tryptamine, serotonin, tryptophol, N-acetylserotonin, 5-hydroxytryptophan, and 3- indoleacetic) that appropriately prevent the matrix effect.

Read More

Study of Spanish wine sensory analysis data over a 3-year period

This study presents an investigation based on sensory analysis data of Spanish wines with geographical indications collected over a three-year period. Sensory analysis plays a crucial role in assessing the quality, characteristics, and perception of wines. The trained tasting panel at Dolmar Laboratory, accredited for objective sensory evaluation of wines since 2016, has been tasting over 5000 wines. However, it is since 2021, when a computer application for tastings was developed, that the digitalization of data allows for detailed statistical analysis of the results.

Read More

Culturable microbial communities associated with the grapevine soil in vineyards of La Rioja, Spain

The definition of soil health is complex due to the lack of agreement on adequate indicators and to the high variability of global soils. Nevertheless, it has been widely used as synonymous of soil quality for more than one decade, and there is a consensus warning of scientists that soil quality and biodiversity loss are occurring due to the traditional intensive agricultural practices.
In this work we monitored a set of soil parameters, both physicochemical and microbiological, in an experimental vineyard under three different management and land use systems: a) addition of external organic matter (EOM) to tilled soil; b) no tillage and plant cover between grapevine rows, and c) grapevines planted in rows running down the slope and tilled soil.

Read More

INTEGRAPE guidelines and tools: an effort of COST Action CA17111

INTEGRAPE was a European interdisciplinary network for “data integration to maximize the power of omics for grapevine improvement” (CA17111, https://integrape.eu/), funded by the European COST Association from September 2018 to 2022. This Action successfully developed guidelines and tools for data management and promoted the best practices in grapevine omics studies with a holistic future vision of: “Imagine having all data on grapevine accessible in a single place”.

Read More