Grapevine cv. tempranillo grafted onto 110R and SO4 rootstocks —gas exchange parameters

Severe water stress can lead to hydraulic disfunction, reducing plant conductance or even causing death. Some plants exhibit hydraulic vulnerability segmentation between organs to reduce this risk. However, its role in influencing drought tolerance and resistance in grafted plants, such as grapevine, remains unclear.
This study aimed to evaluate the physiological responses, drought tolerance, hydraulic vulnerability segmentation and xylem anatomy of two-year-old Vitis vinifera cv. Tempranillo scion grafted onto two rootstocks: 110-Richter (110R) and Sélection Oppenheim 4 (SO4). After subjecting the plants to drought conditions until the onset of embolism in the leaf (P12), we analysed the physiological consequences during recovery.
Grapevine exhibits hydraulic vulnerability segmentation not only within scion organs but also between the scion and rootstock. Although no differences in scion drought tolerance and embolism resistance were observed between combinations, Tempranillo-110R exhi..., , , # Field Data. Gas exchange parameters

[https://doi.org/10.5061/dryad.ht76hdrrq](https://doi.org/10.5061/dryad.ht76hdrrq)

## Description of the data and file structure

In the second group of plants (n=6), vine water status and leaf gas exchange measurements were conducted in the plants maintained under field conditions at WW, WD, R1 and R2 stages. Predawn leaf water potential (ΨPD) and midday stem water potential (Ψstem) were measured using a pressure chamber (Model 600, PMS Instruments, USA) in fully expanded leaves. ΨPD measurements were taken before sunrise, between 05:00 and 06:00, while Ψstem measurements were conducted at solar noon on leaves that had been covered for 1 h inside a zip-lock bag with metallized high-density polyethylene reflective film (Sonoco RF, Sonoco Products Co., USA), to halt transpiration and allow the Ψleaf to equilibrate with the stem potential. Gas exchange measurements, including leaf AN, gs, and transpiration (E) were performed on sunny days in the mid...