Abstract
An overview is given of what is known of genetic variability in the economically most important species of the parasitic weeds Orobanche (broomrape) and Striga (witchweed). Data are included on morphotypes, chromosome numbers, iso-enzyme patterns and biotypes differing in virulence to their hosts. It has been concluded that there is ample variability and that, especially in the autogamous species, an important part of the variability is genetically determined. As a consequence it was concluded that in breeding programmes for tolerant/resistant crops, apart from available defense mechanisms in the hosts, the genetic variability of the parasites should be taken into consideration. The population ecology of weedy Orobanche and Striga species has been discussed in connection with their genetic variability and it has been hypothesized that adaptation to agro-ecosystems may have brought about a significant effect on their survival strategy. In order to obtain a better understanding of the evolution from wild parasitic plants into agressive parasitic weeds as well as the genetic resource in wild hosts regarding tolerance/resistance mechanisms, it has been proposed to carry out comparative studies with weedy biotypes of Orobanche and Striga species in natural vegetation.
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Pieterse, A.H., Verkleij, J.A.C. (1991). Genetic variability in Orobanche (broomrape) and Striga (witchweed) and its implications for host crop resistance breeding. In: Rozema, J., Verkleij, J.A.C. (eds) Ecological responses to environmental stresses. Tasks for vegetation science, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0599-3_25
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DOI: https://doi.org/10.1007/978-94-009-0599-3_25
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