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Basic shoot characteristics predict the cropping potential of young sweet cherry (Prunus avium L.) trees

ABSTRACT The basic shoot characteristics of ‘Karina’ and ‘Sylvia’ sweet cherry (Prunus avium L.) trees grafted on Gisela 3, Gisela 5, Piku 4, Weiroot 72 and F12/1 rootstocks were examined 3 years after planting. In both cultivars, F12/1 achieved a greater shoot length (SL) and diameter (SD) and a lower number of flower clusters per cm SL (NFC·cm−1 SL) than the other rootstocks. Furthermore, although the two cultivars had different growth vigour, they exhibited similar differences in SL, SD and NFC·cm−1 SL among the rootstocks. The correlation between SL and NFC·cm−1 SL was 34.4% and 39.9% greater than the correlation between SD and NFC·cm−1 SL in ‘Karina’ and ‘Sylvia’, respectively. Regression analysis for both cultivars on particular rootstocks and for the mean values across the rootstocks showed that there was a logarithmic relationship between SL and NFC·cm−1 SL, with r 2 values of 0.703 and 0.694 for ‘Karina’ and ‘Sylvia’, respectively, when the responses were fitted by logarithmic function models. The minimum and maximum NFC·cm−1 SL predicted by these models were approximately 0.01 and 0.9 (for SL = 145 and 7 cm, respectively) for ‘Karina’ and 0.0 and 0.9 (for SL = 150 and 5 cm, respectively) for ‘Sylvia’. These findings combined with data obtained in previous studies suggest that NFC·cm−1 SL can be used as an index for predicting the fruiting potential of young sweet cherry trees.