terclim by ICS banner
IVES 9 IVES Conference Series 9 Apoplastic pH influences Vitis vinifera Barbera recovery responses to short and prolonged drought 

Apoplastic pH influences Vitis vinifera Barbera recovery responses to short and prolonged drought 

Abstract

Alteration of sap pH is one of the first chemical changes that occurs within the xylem vessels of plants exposed to drought. Xylem sap acidification accompanied by the accumulation of soluble sugars has been recently documented in several species (Sharp and Davis, 2009; Secchi and Zwieniecki, 2016). Here, Vitis vinifera plants of the anysohydric cultivar Barbera were exposed to either short (no irrigation; SD) or to prolonged drought (continual reduction of 10% water; PD). When comparable severe stress was reached, the potted grapes were re-watered. SD was characterized by fast (2–3 days) stomatal closure and high abscisic acid (ABA) accumulation in xylem sap (>400 μg L−1) and in leaf. In PD plants, the rise in ABA levels was considerably diminished. We observed a pronounced acidification of the xylem sap pH, coupled with a rise in the concentration of soluble sugars, during the recovery phases following both types of water stress. Nevertheless, in plants subjected to PD, pH acidification initiated as early as the more severe stages of stress. The reduction in Non-Structural Carbohydrates (NSC) observed in both leaf and wood tissues during the recovery phase suggests that sugar reserves were likely utilized to facilitate recovery fulfilment. In plants exposed to SD, the intense and abrupt increase in ABA was likely the primary response strategy to stress. The plants favored a protective strategy aimed at minimizing damage caused by sudden stress. Conversely, under PD conditions, the plants exhibited greater acclimatization, implementing an alternative response strategy that encompassed osmoregulation mechanisms triggered by pH acidification.

Download the abstract

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Article

Authors

Cristina Morabito1*, Jessica Orozco2, Maciej Zwieniecki2, Francesca Secchi1

1 Department of Agriculture, Forest and Food Sciences, University of Turin, Largo Paolo Braccini 2, 10095 Grugliasco (Italy)
2 Department of Plant Sciences, University of California Davis, One Shields Avenue, 95616 Davis (CA), USA3 Affliliation

Contact the author*

Keywords

pH, xylem sap, drought, recovery, soluble sugar

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Exploring the genomic diversity of yeast involved in spontaneous fermentation. from studies to select autochthonous strains of different italian’s wineries to extensive phylogenetic survey about the italians’ population of s. cerevisiae

Modern winemakers must ensure effective alcoholic fermentation without losing the intrinsic biodiversity of the different oenological contexts. In this sense, the population of saccharomyces cerevisiae characteristic of wineries that traditionally do not use selected yeasts can represent an interesting reservoir of biodiversity.

Read More

Applications of a novel molecular phenology scale to align the stages of grape berry development

Phenology scales widely adopted by viticulturists (i.e., BBCH or modified E-L systems) are classification tools that describe seasonal and precisely recognized stages of fruit growth and development based on specific descriptors such as visual/physical traits or easy-to-measure compositional parameters.

Read More

Characterising the chemical typicality of regional Cabernet Sauvignon wines

Aim: To define the uniqueness of Australian Cabernet Sauvignon wines by evaluation of the chemical composition (volatile aroma and non-volatile constituents) that may drive regional typicity, and to correlate this with comprehensive sensory analysis data to identify the most important compounds driving relevant sensory attributes.

Read More

ASSESSING THE ROLE OF 27 KNOWN BITTER COMPOUNDS IN COMMERCIAL WHITE WINES COMBINING LC-MS QUANTIFICATION AND SENSORY ANALYSIS

The balance between the different flavours of a wine largely determines its perception and appreciation by the consumers. In white wines, sweetness and sourness are usually the two poles balancing the taste properties. The bitter flavour, on the other hand, is frequently associated with a loss of equilibrium and all white wines (dry and sweet, young and aged) are affected.
Several bitter compounds are already well-described in wines.

Read More

Reducing chemical use in vineyards. Evidence from the analysis of a national demonstration Network

High quantities of chemicals are applied in the vineyard for pest and disease control. Transition towards low pesticide viticulture is a key issue to improve sustainability. Winegrowers have to gradually change their practices to engage in this transition. This work aims at analysing the pesticide use evolution during transition towards low pesticide vineyards and identify some management options mobilized by winegrowers. To understand the diversity of pathways taken towards agroecological transition, we characterized different types of pesticide use evolution.

Read More