J. Privé, C. Embree
Electrolyte leakage (EL) and regrowth were utilized to determine root hardiness for the apple rootstocks B.118, B.490, B.A., KSC.28, M.7, M.9, M.26, MM.106, MM.111 and two strains of 0.3 following 18h cold temperature treatments of +4, -8, -10, -12, -14 and -16C. EL from excised root pieces was not consistent with regrowth results. KSC.28 and M.26 gave the best survival and regrowth; B.A. was variable; B.118 and B.490 had fair to good survival and regrowth; 0.3, MM.106 and MM.111 had good survival but poor regrowth while M.7 and M.9 had poor survival and regrowth. Roots of two-year-old B.A., KSC.28 and M.26 rootstocks had less mortality and regrowth than those only one year old in the same trial. Shoot growth dry weight and root volume increase were good indicators of low temperature injury and will be used to determine the hardiness of future apple rootstocks.
Privé, J. and Embree, C. (1997). LOW TEMPERATURE INJURY AND RECOVERY OF APPLE ROOTSTOCKS. Acta Hortic. 451, 179-186
DOI: 10.17660/ActaHortic.1997.451.18
Malus domestica Borkh., electrolyte leakage, root volume, shoot growth, root hardiness

Acta Horticulturae