Author:
Brown A. H. D.,Brubaker C. L.
Abstract
Genetical research stands to make crucial contributions to the
in situ conservation of wild Australian relatives of
crop plants, management of their ex situ germplasm
collections, and their use in crop improvement. For instance, population
genetic theory is basic in formulating collecting strategies. Results from the
neutral allele model indicate that allelic richness in samples from
equilibrium populations is, although directly proportional to the population
size, proportional to the logarithm of the sample size. Such trends underline
the importance of dividing the sampling effort among many populations. Our
empirical genetical studies have been in the Australian wild relatives of
soybean and cotton. These species not only contain significant genetic
resources for improving their related crops, but also may be at risk from
unwanted hybridisation. In perennial Glycine species,
previous cytological and genetic research detected major races within the
G. tabacina polyploid complex. A maternal phylogeny on
the basis of chloroplast restriction-site variation defined plastome lineages
and clarified the evolution of the polyploid complexes. Ongoing research with
nuclear sequences focuses on the relationship between chloroplast and nuclear
phylogenies and morphology. In Gossypium, estimates of
interspecific hybrid fertility and outcrossing rates in natural populations
near current cotton crops point to negligible risk of transgene escape from
genetically engineered commercial cotton cultivars.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
13 articles.
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