Morphometric and Serologic Comparisons of a Number of Populations of Cyst Nematodes
AbstractThirty-five populations of Heterodera glycines and populations of 15 other Heterodera, Globodera, and Punctodera species were studied morphometrically and some were compared serologically. There was a wide range of each measurement within each nematode popnlation. Except for one soybean cyst nematode population from Indiana, which was a tetraploid and considerably larger than the others, morphometric measurements overlapped. In a discriminant function comparison most of the populations were closely grouped but at least three were rather distinctly separated. Morphometrically H. fici, H. cruciferae, H. schachtii, and H. trifolii were closely associated with H. glycines. Serology indicated a close relationship between H. glycines, H. lespedezae, H. tripdii, H. schachtii, and the Heterodma sp. from Rumex, while H. betulae appeared to be more distantly related. Key words: Heterodera glycines, Globodera, Punctodera, races.
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