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ISHS Acta Horticulturae 903: IX International Symposium on Integrating Canopy, Rootstock and Environmental Physiology in Orchard Systems

COLD TEMPERATURE TOLERANCE OF G.16 AND G.935 APPLE ROOTS

Authors:   R.E. Moran, D. Zhang, Y. Sun
Keywords:   Malus domestica, hardiness, electrolyte leakage, rootstock, M.26 EMLA
DOI:   10.17660/ActaHortic.2011.903.36
Abstract:
G.16 had similar root tissue cold hardiness as M.26 EMLA. Significant root death, 40%, occurred at temperatures of -12C in both rootstocks. Tree growth of M.26 EMLA after 40 days in a greenhouse was reduced by exposure to -10C and colder, whereas tree growth of G.16 was reduced by -12C. In a separate experiment, G.935 had greater cold hardiness than M.26 EMLA, based on shoot growth following exposure to freezing temperatures to a low of -16C. Root tissue relative electrical conductivity (REC) increased linearly with decreasing temperature in both G.935 and M.26 EMLA, but the rate of increase in REC was greater in M.26 EMLA.
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