Macrowine 2021
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

Related articles…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.