New Zealand Journal of Botany abstracts
*Author for correspondence.
B00011Received 20 April
2000; accepted 10 August 2000
Genetic variation and structure of remnant stands of pohutukawa
(Metrosideros excelsa, Myrtaceae)
ANDREW G. YOUNG
Centre for Plant Biodiversity Research
CSIRO Plant Industry
GPO Box 1600
Canberra ACT 2601, Australia
GABRIELE SCHMIDT-ADAM
BRIAN G. MURRAY*
School of Biological Sciences
The University of Auckland
Private Bag 92019
Auckland, New Zealand
Abstract Genetic variation and interpopulation structure
were assessed in 20 populations of the New Zealand coastal tree
Metrosideros
excelsa (pohutukawa) using allozyme markers. Average levels of polymorphism
(
P = 58%) and allelic richness (
Na = 1.69) were typical of
long-lived trees and higher than has been previously observed for other New
Zealand tree species, which have generally been found to be genetically
depauperate. Observed heterozygosity was low (mean
Ho = 0.12) and
consistently less than expected under Hardy-Weinberg equilibrium (
Fis =
0.26), suggesting significant inbreeding. Interpopulation genetic
differentiation was moderate (
Fst = 0.20, mean
D = 0.053) and
this was correlated with low interpopulation gene flow estimates (
Nm =
1.15). These results suggest that revegetation programmes should source seed
locally and avoid taking material from small populations in which selfed seed
may make up a significant portion of the seed crop.
Keywords Metrosideros excelsa; pohutukawa; allozyme
analysis; genetic variation
New Zealand Journal of Botany, 2001, Vol. 39: 133-140
0028-825X/00/3901-0133 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (580K); (scanned from paper original: notes about this process)
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