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…

The evaluation of tannin activity in south african red wines

Astringency is an important red wine quality attribute, which can be measured both chemically and sensorially. The use of tannin activity shows potential as a valuable chemical measurement in understanding red wine mouthfeel properties such as astringency and bitterness, which is also affected by tannin structural factors, in addition to matrix effects. Tannin activity is defined as the enthalpy of interaction between tannins and a hydrophobic surface. Studies involving tannin activity have been performed since the early 2010’s, but chemosensory studies used to evaluate how structure-activity relationships change across multiple, consecutive vintages are limited. The aim of this study is to investigate how tannin activity may be linked to red wine mouthfeel, and how all these variables may change according to wine age.

Read More

What does the functional-structural plant model hydroshoot tell us about the reasons for grapevine (Vitis vinifera L.) photosynthesis depression?

Grapevine is a species that get along with water deficit. Yet, it cannot always stand thirst when accompanied by high temperatures, reducing noticeably its gas-exchange rates. Elucidating the origins of this reduction is a challenge, regarded the complex hydraulic, biochemical and energy processes lying behind gas-exchanges.

Read More

Variability of Constitutive Stilbenoid Levels and Profiles in Grape Canes (Vitis spp.) depending on Genetic and Environmental Factors

Grape cane is a viticultural by-product that is currently underused or not used at all. Therefore, it bears a high potential for valorization due to the presence of anti-microbially active stilbenoids, being biologically relevant for plant defense. These compounds are highly interesting for applications in the agricultural sector as well as for the food and feed industry.

Read More

Terpenoid profiles and biosynthetic gene expression pattern in Asti DOCG white muscat grapes at ripening as affected by different canopy management protocols

Aim: The main goal of this study was to find an efficient canopy management to limit the high temperature-related aroma losses of White Muscat grapes, and consequently to preserve the quality standards of Asti DOCG wines.

Read More

Characterization of “territoires” throughout the production of wines obtained with withered grapes: the cases of “Terra della Valpolicella” (Verona) and “Terra della Valle del Piave” (Treviso) in Northern Italy

Dans la définition et la description d’un “territoire” (“terra” en italien), avec les facteurs du milieu et génétiques, un rôle important est joué par ceux agronomiques, techniques et de culture qui contribuent à caractériser le produit d’une zone spécifique.

Read More