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Ageing delays the cellular stages of adventitious root formation in pine


Rasmussen, A and Hunt, MA, Ageing delays the cellular stages of adventitious root formation in pine, Australian Forestry, 73, (1) pp. 41-46. ISSN 0004-9158 (2010) [Refereed Article]

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DOI: doi:10.1080/00049158.2010.10676308


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.

Item Details

Item Type:Refereed Article
Keywords:vegetative propagation, juvenility, maturation, rooting capacity, adventitious roots, histology, Pinus
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree nutrition and physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Softwood plantations
UTAS Author:Hunt, MA (Professor Mark Hunt)
ID Code:102708
Year Published:2010
Web of Science® Times Cited:10
Deposited By:Plant Science
Deposited On:2015-09-03
Last Modified:2015-10-06

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