Abstract
English
Highlights
Genotypic variation in populations is the expression of morphological and phenotypic differences between and within populations for the traits concerned and is typically measured in a common environment
There are a number of factors responsible for creating genetic variation, such as mutation, recombination, genetic drift, mating system, gene flow and selection pressure (Slatkin, 1987)
One would expect that flowering time would play an important role in the adaptation of wild radish to Western Australia
Summary
Genotypic variation in populations is the expression of morphological and phenotypic differences between and within populations for the traits concerned and is typically measured in a common environment. The breeding systems of colonizing species are known to play an important role in their success. It is well recognized for example, that among colonizing species, inbreeding is by far the more common system (Henslow, 1879; Price and Jain, 1981; Barrett and Richardson, 1986). The best example in Australia is annual ryegrass (Lolium rigidum Gaud.), a widespread weed in the cereal belt of southern Australia. Has it colonized many different habitats but it adapts rapidly to changing circumstances. Other outcrossing weeds that have successfully colonized large areas of southern Australia are salvation jane (Echium plantagineum) (Brown and Burdon, 1983) and cape weed (Arctotheca calendula) (Dunbabin and Cocks, 1999; Dunbabin, 2001)
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