ISHS Acta Horticulturae 567: IV International Strawberry Symposium
EVALUATION OF THREE METHODS TO ASSESS WINTER-HARDINESS OF STRAWBERRY GENOTYPES |
| Authors: | L. Lindén, P. Palonen, T. Hytönen |
| Keywords: | controlled freezing test, cultivar selection, Fragaria x ananassa, screening method |
| Abstract:
Frequently occurring winter injury is one of the major problems of strawberry production in northern areas. Controlled freezing tests provide an option for screening genotypes for their winter survival potential. In this study, hardiness of strawberry genotypes was assessed by three low-temperature procedures: artificial hardening-dehardening-rehardening regime accompanied by freezing tests, prolonged freezing test and cold hardiness measurement of field-grown plants. Each procedure enabled differentiation between genotypes. The hardening-dehardening-rehardening regime predicted the known hardiness ranking of cultivars moderately well. Storage at -6ºC for 11 d could not distinguish the less hardy cultivars, whereas lengthening the storage period up to 26 d revealed genotypic differences in low-temperature tolerance. Field-grown plants were sampled for cold hardiness measurements in January, March and April. Genotypic differences in hardiness were most readily identified in January. | |
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