Journal Article

Scion–rootstock interaction affects the physiology and fruit quality of sweet cherry

Berta Gonçalves, José Moutinho-Pereira, Alberto Santos, Ana Paula Silva, Eunice Bacelar, Carlos Correia and Eduardo Rosa

in Tree Physiology

Volume 26, issue 1, pages 93-104
Published in print January 2006 | ISSN: 0829-318X
Published online January 2006 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/26.1.93
Scion–rootstock interaction affects the physiology and fruit quality of sweet cherry

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Water relations, leaf gas exchange, chlorophyll a fluorescence, light canopy transmittance, leaf photosynthetic pigments and metabolites and fruit quality indices of cherry cultivars ‘Burlat’, ‘Summit’ and ‘Van’ growing on five rootstocks with differing size-controlling potentials that decrease in the order: Prunus avium L. > CAB 11E > Maxma 14 > Gisela 5 > Edabriz, were studied during 2002 and 2003. Rootstock genotype affected all physiological parameters. Cherry cultivars grafted on invigorating rootstocks had higher values of midday stem water potential (ΨMD), net CO2 assimilation rate (A), stomatal conductance (gs), intercellular CO2 concentration (Ci) and maximum photochemical efficiency of photosystem II (PSII) (Fv/Fm) than cultivars grafted on dwarfing rootstocks. The ΨMD was positively correlated with A, gs and Ci. Moreover, A was positively correlated with gs, and the slopes of the linear regression increased from invigorating to dwarfing rootstocks, indicating a stronger regulation of photosynthesis by stomatal aperture in trees on dwarfing Edabriz and Gisela 5. The effect of rootstock genotype was also statistically significant for leaf photosynthetic pigments, whereas metabolite concentrations and fruit physicochemical characteristics were more dependent on cultivar genotype. Among cultivars, ‘Burlat’ leaves had the lowest concentrations of photosynthetic pigments, but were richest in total soluble sugars, starch and total phenols. Compared with the other cultivars, ‘Summit’ had heavier fruits, independent of the rootstock. ‘Burlat’ cherries were less firm and had lower concentrations of soluble sugars and a lower titratable acidity than ‘Van’ cherries. Nevertheless, ‘Van’ cherries had lower lightness, chroma and hue angle, representing redder and darker cherries, compared with ‘Summit’ fruits. In general, ΨMD was positively correlated with fruit mass and A was negatively correlated with lightness and chroma. These results demonstrate that: (1) water relations and photosynthesis of sweet cherry tree are mainly influenced by the rootstock genotype; (2) different physicochemical characteristics observed in cherries of the three cultivars suggest that regulation of fruit quality was mainly dependent on the cultivar genotype, although the different size-controlling rootstocks also had a significant effect.

Keywords: canopy light transmittance; chlorophyll a fluorescence; fruit physicochemical characteristics; gas exchange; leaf metabolites; photosynthetic pigments; Prunus avium; size-controlling rootstocks; water relations

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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