 IVES 9 IVES Conference Series 9 Lamp – a modern tool for the detection of fungal infections in the vineyard

Lamp – a modern tool for the detection of fungal infections in the vineyard

Abstract

AIM: Loop-mediated isothermal amplification (LAMP) [1] is a modern technology for fast and sensitive amplification of specific DNA sequences under isothermal conditions. Its simple handling and no need for dedicated equipment together with an evaluation of the amplification event by in-tube detection make this method advantageous and economically affordable for on-site investigations in the industry. In this study, the applicability of such assays for the detection of fungal infections in grape, soil, and must samples was tested and optimized.

METHODS: 88 grape, 42 soil, and 15 must samples from different vineyards in Europe collected during the harvest 2020 were tested with LAMP assays optimized for the specific detection of Botrytis (B.) cinerea [2] responsible for Botrytis bunch rot, the gushing-inducing fungus Penicillium (P.) oxalicum [3], and with a newly developed LAMP assay for the detection of the mycotoxin-producing and gushing-inducing fungus P. expansum [4,5].

RESULTS: The optimized LAMP assay for the detection of B. cinerea revealed positive samples in all tested vineyards. For P. oxalicum, 6% of grape samples showed positive results while soil and must were tested negative. P. expansum was only found in Germany with 28% of grape, 10% of soil, and 13% of must samples revealing positive results.

CONCLUSIONS:

The application of LAMP assays for the detection of fungal infections prior to the occurrence of visual mold symptoms by testing samples from vineyards is particularly beneficial. A specific and sensitive detection can be performed within 60 minutes of incubation and results can be monitored by naked eye inspection at day light. A simple sample preparation and the use of simple equipment like a water bath make LAMP a powerful tool for on-site investigations in the winemaking industry. SUPPORT: AiF 19952 N.

DOI:

Publication date: September 3, 2021

Issue: Macrowine 2021

Type: Article

Authors

Lisa M. Frisch, Magdalena A. MANN, y Rudi F. VOGEL, Ludwig NIESSEN

Technical University of Munich, Germany

Contact the author

Keywords

loop-mediated isothermal amplification (lamp), diagnosis, fungal infection, champagne gushing, on-site investigation

Citation

Impact of temperature and solar radiation on grape composition variability in the Saint-Emilion winegrowing area

Grape composition is strongly influenced by climate conditions. Their expected modifications in near future, notably because of increased temperatures, could significantly modify the biochemical composition of berries at harvest, and thus wine typicity and quality. Elevated temperatures favor sugar accumulation in grapes, enhance malic acid degradation and modify the amino acid content. They also reduce significantly anthocyanin accumulation in Merlot, leading to the imbalance between anthocyanins and sugars, while no significant effects on final anthocyanin levels were reported in Tempranillo[1] and finally affect aromas or aroma precursors.

Yeast mannoprotein characterization and their effect on Oenococcus oeni and malolactic fermentation

Mannoproteins are released at the end of alcoholic fermentation due to yeast autolysis [1]. It has been described a positive effect of these molecules on lactic acid bacteria growth [2]. The main objective of this work was the characterization of different mannoproteins extracted from active dry yeast (ADY) and the assessment of their effect on Oenococcus oeni and malolactic fermentation (MLF).

Rootstock selection moderates the effect of rising temperatures through drought tolerance and modulation of stomatal conductance

Climate change is increasing crop evapotranspiration and reducing water availability, especially in the Mediterranean area.

The importance of rural extension and advisory services to achieve a sustainable viticulture in a climate change scenario

A healthy and dynamic agricultural sector is an important foundation of rural development, generating strong bonds to other economic sectors.

Highlighting the several chemical situations of Dimethyl sulfide in wine

Dimethyl sulfide (DMS) is a compound that accumulate in wine for the early years of ageing 1. During this stage, which is often carried out in the bottle, the environmental conditions are conducive to the release of DMS from its precursors, already present in grapes2