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Multi-parameter characterization of water stress tolerance in Vitis hybrids for new rootstock selection
Davide Bianchi1, Daniele Grossi1, Davide T G Tincani1
1DISAA, Dipartimento di Scienze Agrarie e Ambientali, Università degli Studi di Milano, via Celoria 2, 20133, Milano, Italy.
Abstract:
Drought in grapevine could be faced using tolerant rootstocks. The present work aims at the evaluation of 25 new genotypes potentially tolerant to drought by using recent methods of phenotypical screening (thermography and on-solid reaction spectroscopy). Plants were grown in well-watered and stressed field conditions. Proxi for transpiration, wood hydrophobicity and starch content were used to characterize and classify the genotypes. The predominant role of the environment was highlighted, nevertheless genotype and genotype × environment interaction showed significant variations as well. Hybrids were classified based on their steady, susceptible or adaptable behavior. The 14 most promising genotypes were identified, 5 of them showing two tolerance mechanisms. In the future, results from this experiment will support viticulture in water limited areas releasing new drought-tolerant interspecific hybrids to be tested after grafting with different scions.
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