Contrasting Responses of Two Grapevine Cultivars to Drought: The Role of Non-structural Carbohydrates in Xylem Hydraulic Recovery

Author:

Vuerich Marco1,Petrussa Elisa1,Boscutti Francesco1ORCID,Braidot Enrico1,Filippi Antonio12,Petruzzellis Francesco3ORCID,Tomasella Martina3ORCID,Tromba Giuliana4,Pizzuto Mauro5,Nardini Andrea3ORCID,Secchi Francesca6,Casolo Valentino1ORCID

Affiliation:

1. Dipartimento di Scienze Agroalimentari, Ambientali e Animali , Via delle Scienze 91, Udine 33100, Italy

2. Dipartimento di Area Medica, Università di Udine , Piazzale Kolbe 4, Udine 33100, Italy

3. Dipartimento di Scienze della Vita, Università di Trieste , Via L. Giorgieri 10, Trieste 34127, Italy

4. Elettra-Sincrotrone Trieste, Area Science Park , Basovizza, Trieste 34149, Italy

5. Vivai Cooperativi Rauscedo , Via Udine, 39, Rauscedo (PN) 33095, Italy

6. Dipartimento di Scienze Agrarie, Forestali, Alimentari (DISAFA), Università di Torino , Largo Paolo Braccini 2, Grugliasco (TO) 10095, Italy

Abstract

AbstractXylem embolism is one of the possible outcomes of decreasing xylem pressure when plants face drought. Recent studies have proposed a role for non-structural carbohydrates (NSCs) in osmotic pressure generation, required for refilling embolized conduits. Potted cuttings of grapevine Grenache and Barbera, selected for their adaptation to different climatic conditions, were subjected to a drought stress followed by re-irrigation. Stem embolism rate and its recovery were monitored in vivo by X-ray micro-computed tomography (micro-CT). The same plants were further analyzed for xylem conduit dimension and NSC content. Both cultivars significantly decreased Ψpd in response to drought and recovered from xylem embolism after re-irrigation. However, although the mean vessel diameter was similar between the cultivars, Barbera was more prone to embolism. Surprisingly, vessel diameter was apparently reduced during recovery in this cultivar. Hydraulic recovery was linked to sugar content in both cultivars, showing a positive relationship between soluble NSCs and the degree of xylem embolism. However, when starch and sucrose concentrations were considered separately, the relationships showed cultivar-specific and contrasting trends. We showed that the two cultivars adopted different NSC-use strategies in response to drought, suggesting two possible scenarios driving conduit refilling. In Grenache, sucrose accumulation seems to be directly linked to embolism formation and possibly sustains refilling. In Barbera, maltose/maltodextrins could be involved in a conduit recovery strategy via the formation of cell-wall hydrogels, likely responsible for the reduction of conduit lumen detected by micro-CT.

Funder

SYRMEP

Publisher

Oxford University Press (OUP)

Subject

Cell Biology,Plant Science,Physiology,General Medicine

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