Vol. 43

Title:
Basics of Propagation by Cuttings—Timing: Age-Related Effects on Adventitious Root Formation

Author:
Robeirt L. Geneve

pp: 450-454

Abstract:
INTRODUCTION

The observation that some plants have a greater potential to form roots on cuttings was known to the earliest horticulturists and recorded by Theophrastus (300 B.C.). Today, root formation in cuttings can be categorized based on their response to auxin. Cuttings are easy to root if application of auxin is not required for rooting. Cuttings can be classified as difficult to root if they require auxin to root at high percentages. Finally, cuttings that fail to root even after auxin application are considered recalcitrant. In many cases, a species' ability to form roots is modified as an individual plant ages. Species with cuttings that are easy to root are not affected considerably by plant age. However, age-related influences must be considered a major limiting factor for cuttings that are difficult or recalcitrant for rooting.

The basic influence of plant age on root formation can be illustrated in red pine (Pinus resinosa) (Gardener, 1929). Red pine is considered a

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