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Ageing delays the cellular stages of adventitious root formation in pine

journal contribution
posted on 2023-05-18, 12:43 authored by Rasmussen, A, Mark HuntMark Hunt
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.

History

Publication title

Australian Forestry

Volume

73

Pagination

41-46

ISSN

0004-9158

Department/School

School of Natural Sciences

Publisher

Taylor & Francis Australasia

Place of publication

Australia

Rights statement

Copyright unknown

Repository Status

  • Restricted

Socio-economic Objectives

Softwood plantations

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