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…

Kegged wine as a sustainable alternative: impact on conservation and sensory quality

Wine is not just a beverage; it represents an entire ecosystem in winemaking regions and is deeply linked to economic, social, and environmental factors.

Read More

Transition metals and light-dependent reactions: application of a response surface methodology approach

Light-induced reactions can be responsible for detrimental changes of white and rosé wines. This is associated to the photo-degradation of riboflavin (RF) and of methionine (Met) causing the appearance of light-struck taste (LST).

Read More

OENOLOGICAL TANNINS FOR PREVENTING THE LIGHT-STRUCK TASTE IN WHITE AND ROSÉ WINES

The light exposure of wine can be detrimental as a relevant loss of aromas takes place [1] and light-induced reactions can occur. The latter involves riboflavin (RF), a photosensitive compound, that is fully reduced by acquiring two electrons. When the electron-donor is methionine, the light-struck taste (LST) can appear leading to cooked cabbage, onion and garlic odours-like [2]. The use of oenological tannins can limit the appearance of LST in both model wine [3] and white wine [4]. This research aimed to evaluate the impact of certain oenological tannins, selected in a previous study as the most effective against LST [5], in both white and rosé wines.

Read More

Climate change is here to stay: adapting vineyards to a warming world

As an industry that thrives more on, but may also be more affected by, vintage variation and regionality than any other agricultural enterprise, grape and wine production is ever more being impacted challenged by climate change.

Read More

Territoire, terroir et marché du vin à la production

Work aimed at understanding the relationship between a terroir, in the agronomic sense, and the physico-chemical characteristics of grapes or wine are numerous today, as evidenced by the program of this symposium. But for an economist, the central question remains to know how the terroir can intervene in the construction of the economic value of wine and in the differentiation of its prices. Is the terroir effect recognized by the end consumer or is it only an internal adjustment variable in the production systems? Through which indicators can this terroir effect be managed by the various operators in the sector? In the end, isn’t it better to invoke a “territorial effect” that the actors can build, and of which the terroir would be one of the possible components?

Read More