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 -12°C in both rootstocks. Tree growth of M.26 EMLA after 40 days in a greenhouse was reduced by exposure to -10°C and colder, whereas tree growth of G.16 was reduced by -12°C. 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 -16°C. 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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