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Juice was manufactured from seven different sour cherry clones/cultivars and evaluated by quantitative descriptive sensory analysis and (1)H NMR spectroscopy. The sensory evaluation showed a large variation in several sensory attributes between the sour cherry clones/cultivars, which could be divided into two groups on the basis of both the sensory data and the NMR spectroscopic data. These groups were closely related to the genetic background of the clones. Kelleris clones were distinctly different from Stevnsberry and Fanal clones. Hence, (1)H NMR spectroscopic data seem to correlate with sensory quality of different sour cherry clones. In addition, malic acid was the most important metabolite for modeling the two highly correlated sensory attributes sweetness and sourness, whereas the glucose content had a slight effect and the fructose content had no impact on sweetness/sourness. Other metabolites (ethyl acetate, asparagine, ethanol) could be correlated with sensory attributes; however, a direct causal connection could not be established.

The tensile strengths of graftings between three selected sweet cherry cultivars and five selected cherry rootstocks were determined with an Instron instrument 6, 12, and 18 weeks after grafting and compared with the tensile strength of self-grafted rootstocks and graftings of rootstocks used as scions. The combination of sweet cherry cultivars and rootstocks was selected to provide a range of compatibility based on preliminary work. The tensile strengths of sweet cherry cultivars grafted on different rootstocks never exceeded the tensile strengths of the self-grafted rootstocks. Rootstocks grafted as scions on Prunus avium L. rootstocks and self-grafted rootstocks produced some of the strongest unions tested and also produced union strength much faster than any of the other combinations. The degree of compatibility was quantified and results indicated that if this value was below 0.2, measured 18 weeks after grafting, it corresponded to combinations with major risks of delayed incompatibility.Key words: tensile strength, grafting, compatibility, sweet cherry, Prunus avium.

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Thirty four varieties of sour cherries (Prunus cerasus) were investigated for their total antioxidant activity, Caco-2 cancer cell proliferation inhibitory activity and effect on prostaglandin E2 (PGE2) production. Total phenolic content, oxygen radical absorbance capacity (ORAC) and cancer cell proliferation inhibitory activity of sour cherries were closely correlated but not PGE2 production. The cultivars 'Birgitte × Böttermö', 'Fanal' and 'Tiki' were the three cultivars with the highest ORAC values (180, 147 and 133 µmol TE/g, respectively) and inhibition against Caco-2 cancer cell proliferation (74%, 79% and 73%, respectively). 'Stevnsbaer Birgitte' (22%) and 'Stevnsbaer Viki' (22%) inhibited PGE2 production with a similar potency as the positive controls indomethacin and NS-398. Significant differences between cultivars in all bioactivity experiments indicated that selection of cultivars is important to obtain sour cherries with better potential health promoting effects.