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…

Drought responses of grapevine cultivars under different environments

Using grapevine genetic diversity is one of the strategies to adapt viticulture to climate change. In this sense, assessing the plasticity of cultivars in their responses to environmental conditions is essential. For this purpose, the drought tolerance of Grenache, Tempranillo and Semillon cultivars grafted onto SO4 was evaluated at two experimental vineyards, one located in Valencia (Spain) and the other in Bordeaux (France). This was done by assessing gas exchange parameters, water relations and leaf hydraulic traits at the end of the season.

Read More

Effect of ultraviolet B radiation on pathogenic molds of grapes

The fungicidal effect of UV-C radiation (100-280 nm wavelength) is well known, but its applicability for the control of pathogenic molds of grapes is conditioned by its effect on the host and by the risks inherent in its handling[1].
As an alternative, the effect in vitro of UV-B radiation (280-315 nm) on the main pathogenic molds of grapes has been studied: Botrytis cinerea, Aspergillus niger, Penicillium expansum and Rhizopus stolonifer.

Read More

The colour pattern of flower arrangements influence wine tasters’ sensory description

The arrangements of flowers and wine counterparts are inextricably linked. Whether a fundamental aspect of tablescaping or acolytes to broader entertainment rituals, they have an entangled history since ancient times. The aim of this contribution is to verify the influence of visually delicate and robust flower arrangements on individual description of wines. Changes in the sensory description of wines were investigated during subjects’ (thirty-two participants) exposure to three different conditions: the presence of delicate, robust, or totally absent flower arrangements. In each condition, the same two wines were blind tasted: a wine previously defined as delicate – a Pinot Noir from Australia, and a wine known for its robust character – a Tannat from Uruguay.

Read More

White grape must processed by UHPH as an alternative to SO2 addition: Effect on the phenolic composition in three varieties

The quantity and distribution of polyphenols in musts play a fundamental role in the white winemaking. This is because these substances are exposed to oxidation reactions, which are catalysed by the polyphenol oxidase (PPO), leading to a decrease in the quality of the wines produced. PPO is inactivated by SO2, but currently, due to the restrictions of the legislation, other methodologies are being investigated. Ultra-High Pressure Homogenization (UHPH) is a non-thermal physic technology that exerts an ultrahigh pressure pumping (>200 MPa) of a fluid through a valve in a continuous system.

Read More

A novel approach for the identification of new biomarkers of wine consumption in human urine using untargeted metabolomics

Wine is one of the most representative components of Mediterranean diet. Moderate wine intake together with food, has been positively correlated with reduced risk of many chronic diseases. This beneficial effect seems to be ascribed to elevated polyphenolic content of wine [1]. Traditional approaches for the identification of wine biomarkers consumption include targeted metabolomics that focuses on the quantification of well-defined metabolites, losing a valuable information about a massive number of compounds. On the other hand, untargeted metabolomics can disclose a large quantity of signals corresponding to potential biomarkers in a single analysis with high sensitivity and resolution.

Read More