Relationship between the Origin and the Cross-Incompatibility of Sweet Potato Varieties

概要

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1. This experiment was carried out aiming at exploring the relationship between the origin and the crossincompatibility of sweet potato varieties. Nine hundred and fifty five varieties, out of which 199 were Japanese local varieites, 542 were Japanese improved varieties and 214 were introduced varieties, were classified into 12 groups (from A to L) from the viewpoint of cross-incompatibility for every origin of varieties.<BR>2. Japanese local varieties belong to either of group A, B or C except only one variety. Introduced varieties include every group, although about half of them belong to group B. Varieties which belong to each group other than A, B and C were those introduced from limited countries. Japanese improved varieties include most of 12 groups, and the varieties which belong to the groups other than A, B and C occurred only when foreign varieties were used as the parent for crossing.<BR>3. It was observed whether the grouping of varieties based on cross-incompatibility agree or not among countries. It was difficult, however, to see the agreement in most cases because test varieties for the classification differ with countries. Therefore, it seems necessary to investigate internationally the relationship among countries as to the grouping of varieties through usage of common test varieties for classification and exchange of information in order to succeed in introducing and breeding of new varieties.
日本熱帯農業学会の論文