Ageing delays the cellular stages of adventitious root formation in pine

Rasmussen, Amanda and Hunt, Mark A. (2010) Ageing delays the cellular stages of adventitious root formation in pine. Australian Forestry, 73 1: 41-46.

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Author Rasmussen, Amanda
Hunt, Mark A.
Title Ageing delays the cellular stages of adventitious root formation in pine
Journal name Australian Forestry   Check publisher's open access policy
ISSN 0004-9158
Publication date 2010-03
Sub-type Article (original research)
Volume 73
Issue 1
Start page 41
End page 46
Total pages 6
Place of publication Yarralumla, Australia
Publisher Institute of Foresters of Australia
Collection year 2011
Language eng
Abstract Vegetative propagation programs internationally are affected by the significant decline of rooting success as trees mature. This study compared the cellular stages of root formation in stem cuttings from 15-week-old (juvenile) and 9-y-old (mature) stock plants of the slash Caribbean pine hybrid (Pinus elliottii var. elliottii P. caribaea var. hondurensis). The cellular stages of root formation were the same in both juvenile and mature cuttings, beginning with cell divisions of the vascular cambium forming callus tissue. Within the callus, tracheids differentiated and elongated to form root primordia. Roots in juvenile cuttings developed faster than those in mature cuttings and the juvenile cuttings had a much higher rooting percent at the end of the study (92% and 26% respectively). Cuttings of the two juvenile genotypes had more primary roots (5.5 and 3.3) than the three mature genotypes (0.96, 0.18 and 0.07). The roots of juvenile cuttings were more evenly distributed around the basal circumference when compared with those on cuttings from the mature genotypes. Further work is needed to improve understanding of physiological changes with maturation so that the rooting success and the speed of development in cuttings from mature stock plants can be optimised, hence improving genetic gain.
Keyword Vegetative propagation
Juvenility
Maturation
Rooting capacity
Adventitious roots
Histology
Pinus
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
 
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Created: Sun, 11 Jul 2010, 00:08:53 EST