Author:
Brown A. H. D.,Doyle J. L.,Grace J. P.,Doyle J. J.
Abstract
DNA-sequence variation at the single-copy nuclear locus histone H3-D was
surveyed in 35 accessions of diploid Glycine tomentella
Hayata (2n = 38, 40) and samples of the closely
related new species Glycine aphyonota B.Pfeil and
Glycine pullenii B.Pfeil, Tindale & Craven. The
objective was a thorough analysis of the infraspecific variation in this
complex species as a prelude to the analysis of the evolutionary origin of its
tetraploid races. The shortest trees found by a heuristic search employing
parsimony all grouped the accessions into five wellsupported clades that
related closely to infraspecific taxa previously recognised from cytogenetic,
isozyme and ITSsequence studies. The most-differentiated race (isozyme label
D4) is related to the so-called A-genome species
G. clandestina Wendl.,
G. canescens F.J.Herm.,
G. latrobeana (Meissn.) Benth. and
G. argyrea Tind. This race is restricted to the central
uplands of Queensland. The two common races from Queensland are the aneuploid
(2n = 38) race and the euploid form from
north-east coastal regions (D3). Remarkably, an isolated
population of this race was found in the northern wetter fringes of the
Kimberley District, Western Australia. The remaining two races
(D5A and D5B) are centred on the
monsoonal tropics of Kimberley and Top End, Northern Territory. These two
groups have distinctive isozyme and morphological features that support the
recognition of such divergence, at least at subspecific level.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
37 articles.
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