Ik. Sharma et al., THE EXTENT AND STRUCTURE OF GENETIC-VARIATION IN THE MACROZAMIA-PAULI-GUILIELMI COMPLEX (ZAMIACEAE), Biochemical systematics and ecology, 26(1), 1998, pp. 45-54
Allozyme variation in 12 enzyme systems coded by 17 loci was investiga
ted in six populations of Macrozamia, including two populations of M.
parcifolia, three populations of M. pauliguilielmi and one population
of nrl. crassifolia from Queensland (Australia) in order to measure th
e levels of genetic variation. This was required to establish whether
the allozyme data supports recent taxonomic treatment. Seven loci were
found to be monomorphic. All species were genetically depauperate, wi
th low levels of genetic diversity (P = 17.6-35.3%, A = 1.2-1.4, H-e =
0.02-0.11) compared with two (only) existing reports, and plants in g
eneral. Genetic differentiation among populations was high (G(ST) = 0.
47). UPGMA cluster analysis using Nei unbiased genetic distance showed
M. parcifolia and M. pauli-guilielmi to be more similar genetically t
o each other than either is to M. crassifolia. This is concordant with
groupings based on morphological characters, thus supporting the obje
ctives of the investigation. (C) 1998 Elsevier Science Ltd. All rights
reserved.