ISHS Acta Horticulturae 169: International Workshop on Improvement of Sweet and Sour Cherry Varieties and Rootstocks
RESULTS OF LABORATORY TESTS FOR WINTERHARDINESS OF P.AVIUM CULTIVARS AND INTERSPECIFIC CHERRY HYBRIDS (PRUNUS X SPP) |
| Authors: | H. Strauch, W. Gruppe |
| Abstract:
We tested winterhardiness of 30 P.avium cultivars and 24 cherry rootstocks (21 interspecific hybrids, P.avium F 12/1, P.mahaleb 'St. Lucie' 64, and 'Colt') using a laboratory method. Shoots of genotypes were sampled from December to March, subjected to pre-treatments of dehardening (0, 3, 7, 10 days at 15°C), frozen for 24 h at -20°C and tested for loss of electrolytes from the tissues. This passive ion leakage from cells of frozen shoots pieces was measured by the electrical conductivity of solutions containing the pieces. In the 3 winters, there was great variation in our average Relative Frost Damage Index (RFD). In the P.avium cultivars, average RFD varied from 48 to 76, in the hybrid clones the RFD averaged from 44 to 70. There were very great differences in RFD between the genotypes after the dehardening pretreatments. Some reacted very slowly until beginning of March, others rapidly lost electrolytes after treatment as early as January. | |
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