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lec05 (dragged) - Phaseolus angularis 9 Velvet bean...

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1 Lecture 5 Lecture 5 Centers of Origin of Crop Plants Fig. 5-1. The eight Vavilovian centers of origin for crop plants The Eight Vavilovian Centers (Fig. 5-1, 5-2) Old World I. Chinese Center: The largest independent center which includes the mountainous regions of central and western China, and adjacent lowlands. A total of 136 endemic plants are listed, among which are a few known to us as important crops. Cereals and Legumes 1. Broomcorn millet, Panicum miliaceum 2. Italian millet, Panicum italicum 3. Japanese barnyard millet, Panicum frumentaceum 4. Kaoliang, Andropogon sorghum 5. Buckwheat, Fagopyrum esculentum 6. Hull-less barley, Hordeum hexastichum 7. Soybean, Glycine max 8. Adzuki bean,
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Unformatted text preview: Phaseolus angularis 9. Velvet bean, Stizolobium hassjoo The origin of crop plants is now basic to plant breeding in order to locate wild relatives, related species, and new genes (especially dominant genes, sources of disease resistance). Knowledge of the origins of crop plants is vitally important in order to avoid genetic erosion, the loss of germplasm due to the loss of ecotypes and landraces, loss of habitat (such as rainforests), and increased urbanization. Germplasm preservation is accomplished through gene banks (largely seed collections but now frozen stem sections) and preservation of natural habitats (especially in centers of origin)....
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