terclim by ICS banner
IVES 9 IVES Conference Series 9 Melatonin priming retards fungal decay in postharvest table grapes 

Melatonin priming retards fungal decay in postharvest table grapes 

Abstract

Postharvest losses of fruits may reach in some cases 40% in developed countries. This food waste has a significant carbon footprint and makes a major contribution toward greenhouse gas emissions so sustainable postharvest strategies are being investigated.

Melatonin, a well-known mammalian neurohormone, has been investigated as a priming agent to slow down fungal decay progression in postharvest climacteric and some non-climacteric fruits. However, the molecular and metabolic mechanisms responsible for such enhancement of disease tolerance are largely unknown. This work aimed to evaluate the effects of melatonin priming in fungal decay progression in postharvest table grapes (Vitis vinifera L. cv. ‘Red Globe’ and ‘Sugra 48’). Melatonin-treated grapes clearly presented lower levels of fungal decay incidence and symptom severity. DNA sequencing putatively identified three fungal species in postharvest grapes: Penicillium expansum, Penicillium crustosum and Cladosporium cladosporioides. While MDA and total anthocyanin content presented no altered levels due to melatonin treatment, phytoalexins´ profile significantly changed (e.g. trans-resveratrol, trans-piceid). Recent untargeted metabolomics data suggests that phenylpropanoid pathway is being remodelled under melatonin treatment (e.g gallic acid, catechin gallate, specific anthocyanins). RNA extraction and sequencing is being conducted to integrate these metabolic results with molecular data. Altogether, results indicate that melatonin priming leads to an effective response to fungal decay in table grapes by modulating secondary metabolism involved in defense. Ultimately, this work will clarify mechanistic processes regarding this innovative priming agent that may also have a positive impact on nutritional quality of fruits.

Download the abstract

DOI:

Publication date: June 14, 2024

Issue: Open GPB 2024

Type: Article

Authors

Maria Paes 1, Florent Weiller1,  Patrícia Pardal1,  Vicent Leclère2, Inês Diniz3, Helena Gaspar1, Aziz Aziz2, Gianmaria Califano1, Ana Margarida Fortes1*

1 BioISI – Biosystems and Integrative Sciences Institute, Faculty of Sciences, University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal
2 University of Reims Champagne-Ardenne, Induced Resistance and Plant Bioprotection (RIBP), USC INRAE Reims 51100, France
3 Linking Landscape, Environment, Agriculture and Food (LEAF), TERRA—Associated Laboratory for the Sustainability of Land Use and Ecosystem Services, Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda 1349-017 Lisbon, Portugal

Contact the author*

Keywords

melatonin priming, postharvest, table grapes, fungal decay, fruit quality

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Drought tolerance of varieties in semi-arid areas: can the behavior of Tempranillo be improved by varieties of its own lineage?

Tempranillo is the most widely grown red grapevine variety in Spain, currently representing 42% of the total number of red varieties and 21% of the total vineyard area. Due to the economic importance that this variety represents in Spanish viticulture, in some areas where it is traditionally grown, there is a special concern about the viability of the future growing of this variety is being compromised by the climate change effects.

Read More

Study of Malvasia di Candia Aromatica shelf-life: effect of time and temperature on aroma compounds through an HS-SPME GCxGC-Ms approach

Young white wines should be consumed within a short time after bottling to avoid loss of their fresh, fruity attributes. Shelf-life of white wines can be extended if they are stored under suitable conditions of time and temperature prior to consumption.

Read More

Marketing terroir wines

The markets for quality wine are becoming more competitive as newer producers emerge and traditional producers improve their quality. The concept of terroir is one way to differenzi­ate wines in a competitive market and to enhance producer income.

Read More

High resolution remote sensing for mapping intra-block vine vigour heterogeneity

In vineyard management, the block is considered today as the technical work unit. However, considerable variability can exist inside a block with regard to physiological parameters, such as vigour, particularly because of soil heterogeneity. To represent this variability spatially, many measurements have to be taken, which is costly in both time and money. High resolution remote sensing appears to be an efficient tool for mapping intra-block heterogeneity.

Read More

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.

Read More