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New roots of  Malus domestica  Borkh MM106 apple rootstock were divided into two categories, 1) feeder roots and 2) extension roots based on morphology and their ability to take up NH 4  + , were studied. The roots were harvested in August from 1-year-old potted plants growing under natural conditions in Corvallis, Ore. Extension roots were thicker and longer than feeder roots. Average diameter and length were 0.89 and 45.29 mm for extension roots and 0.27 and 5.36 mm for feeder roots. Root special length (cm/g FW) and surface area (cm 2 /g FW) were 11.94 and 33.17 for extension roots and 108.97 and 93.38 for feeder roots. Maximum uptake rate, I max , K m , an d  root absorption power, α (α = I max •1/K m ), for NH 4  +  absorption were 6.875, 0.721, and 9.48 for extension roots and 4.32, 0.276, and 15.63 for feeder roots. Feeder roots had stronger affinity to NH 4  +  (low K m ) and higher NH 4  +  absorption power (high α value) than extension roots. The feeder roots were better able to uptake NH 4  +  at lower external solution concentrations than extension roots according to the nutrient depletion curve, which indicates feeder roots being more efficient than extension roots in nutrient absorption when NH 4  +  availability was low.

289 Ammonium Ion Uptake by Feeder and Extension Roots of MM106 Apple Rootstock