Cuttings of Wollemi pine tolerate moderate photoinhibition and remain highly capable of root formation

K E Pohio; Helen M Wallace; R F Peters; Tim E Smith; Stephen J Trueman

doi:10.1007/s00468-005-0418-3

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Cuttings of Wollemi pine tolerate moderate photoinhibition and remain highly capable of root formation

Journal article

Peer reviewed

Cuttings of Wollemi pine tolerate moderate photoinhibition and remain highly capable of root formation

K E Pohio, Helen M Wallace, R F Peters, Tim E Smith and Stephen J Trueman

Trees, Vol.19(5), pp.587-595

2005

DOI: https://doi.org/10.1007/s00468-005-0418-3

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Abstract

Wollemi nobilis

Araucariaceae

conservation

propagation

photoinhibition

The Wollemi pine was discovered in 1994 at the base of a deep rainforest canyon in the Wollemi National Park, southeastern Australia. Only three populations have been found, comprising less than 100 adult trees. We investigated vegetative propagation methods, focussing on rooting of cuttings with different amounts of foliar pruning, irradiance or fertiliser application, and we compared anatomy and rooting of cuttings at two different stages of stem development. We related root production to levels of photoinhibition experienced during the propagation phase, quantifying photoinhibition by measuring chlorophyll fluorescence. Maximum photochemical efficiency (FV/FM) of cuttings declined during daily stress periods, particularly after many weeks without roots in the propagation environment, but these declines did not inhibit root formation. Mean percentage of cuttings that formed roots was usually high (79.4-94.0%). Treatments that alleviated photoinhibition, such as low irradiance or foliar fertilisation, did not increase rooting percentages. Other treatments that did not alleviate photoinhibition, such as incorporation of fertiliser in the medium or no pruning, did accelerate formation of an extensive root system. Soft cuttings had a less-developed sclerenchyma ring in their cortex compared with firm cuttings, but both cutting types provided high rooting percentages. Our results showed that cuttings under mist irrigation can be prone to long periods of moderate photoinhibition and yet remain highly capable of root production.

Details

Title: Cuttings of Wollemi pine tolerate moderate photoinhibition and remain highly capable of root formation
Authors: K E Pohio (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
Helen M Wallace (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
R F Peters (Author) - Queensland Department of Primary Industries and Fisheries
Tim E Smith (Author) - Queensland Department of Primary Industries and Fisheries
Stephen J Trueman (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
Publication details: Trees, Vol.19(5), pp.587-595
Publisher: Springer
Date published: 2005
DOI: 10.1007/s00468-005-0418-3
ISSN: 0931-1890
Organisation Unit: Faculty of Science, Health, Education and Engineering; School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; GeneCology Research Centre - Legacy; National Centre for Timber Durability and Design Life
Language: English
Record Identifier: 99448949402621
Output Type: Journal article

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