Carbon allocation strategies and water uptake in young grafted and own-rooted hazelnut (Corylus avellana L.) cultivars

Author:

Portarena Silvia1,Gavrichkova Olga1,Brugnoli Enrico1,Battistelli Alberto1,Proietti Simona1,Moscatello Stefano1,Famiani Franco2,Tombesi Sergio3,Zadra Claudia4,Farinelli Daniela2

Affiliation:

1. Institute of Research on Terrestrial Ecosystems (IRET), National Research Council (CNR), Via G. Marconi 2, 05010 Porano, Italy

2. Department of Agricultural, Food, and Environmental Sciences (DSA3), University of Perugia, Via Borgo XX Giugno 74, 06121 Perugia, Italy

3. Department of Sustainable Crop Production, University Cattolica Sacro Cuore, Via E. Parmense 84, 29122 Piacenza, Italy

4. Department of Pharmaceutical Sciences, University of Perugia, via Borgo XX Giugno 74, 06121 Perugia, Italy

Abstract

Abstract In this study, grafted and own-rooted young hazelnut plants of three high-quality cultivars were cultivated in Central Italy to investigate possible differences in growth, fruit and flower production, and physiological processes encompassing water uptake, photosynthetic variables and non-structural carbohydrate allocation. Stable isotopes and photosynthetic measurements were used to study carbon and water fluxes in plants. For the first time, an ecophysiological study was carried out to understand the seasonal growth dynamics of grafted plants in comparison with own-rooted plants. The own-rooted hazelnuts showed rapid above-ground development with large canopy volume, high amount of sprouts and earlier yield. The grafted plants showed greater below-ground development with lower canopy volumes and lower yield. However, later, the higher growth rates of the canopy led these plants to achieve the same size as that of the own-rooted hazelnuts and to enter the fruit production phase. Different seasonal behaviour in root water uptake and leaf photosynthesis-related variables was detected between the two types of plants. The grafted plants showed root development that allowed deeper water uptake than that of the own-rooted hazelnuts. Moreover, the grafted plants were characterized by a higher accumulation of carbohydrate reserves in their root tissues and by higher stomatal reactivity, determining significant plasticity in response to seasonal thermal variations.

Funder

Ministero delle Politiche Agricole Alimentari e Forestali

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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