© 1993 Heron Publishing—Victoria, Canada
Early and late root formation in epicotyl cuttings of Pinus sylvestris after auxin treatment
Gunnar Flygh (1), Roland Grönroos (1), Leif Gulin (2) and Sara von Arnold (1)
1. Department of Forest Genetics, Swedish University of Agricultural Science, Box 7027, S-750 07 Uppsala, Sweden / 2. SCA Skog AB, Bogrundets Plantskola, Box 90, S-860 30 Sörberge, Sweden / Received February 14, 1992
Summary
Auxin stimulated rooting of epicotyl cuttings of Pinus sylvestris irrespective of the physiological stage of the plant from which the cuttings were taken. The epicotyl cuttings were divided
into two groups, those that differentiated roots early (within 6 weeks after cutting) and those that differentiated roots
late (more than 6 weeks after cutting). Auxin treatment significantly stimulated the frequency of early rooting of epicotyl
cuttings, whereas it had no effect on the frequency of late rooting of epicotyl cuttings.
The number of roots per rooted cutting was significantly higher after auxin treatment both on early and late rooted cuttings.
Anatomical studies showed that most of the roots on both early and late rooted
cuttings developed from wound tissue. However some types of rooting were found only after auxin treatment of early rooted
cuttings, e.g., roots that developed from resin duct wound tissue or from vascular tissue or in the pith.
Keywords:
hypocotyl cuttings, rooting type, vegetative propagation, wound tissue.
