Among the various suggested procedures, the assignment of specific linkage groups to members who might volunteer for them seems to be the most satisfactory. For the larger groups, like those of chromosome 2, it would probably be best for two members to share the work; for several poorly populated groups, the burden, at least at the start, would be light. The plan is visualized as follows: screening the unlocated mutant into its proper group would be accomplished by the discoverer or by anyone who might volunteer to do such work. After a linkage has been detected., the mutant would be turned over to the member responsible for the respective group for more precise placement in the linkage map.
A similar method was originally adopted to advantage by the maize group, later fell into disuse, but has been recently revived. Such assignments are also being used successfully by the barley group.
Finding the loci of genes for disease resistance presents a special problem. The infection methods for such diseases as fusarium and verticillium wilts are so well understood and easily managed that it might be possible for most of the linkage cooperators to work with the respective genes for resistance. But with many other diseases the necessary skills and equipment are so specialized that the progress of linkage studies with the respective resistances may depend largely upon the pathologist or the pathologist-geneticist teams wherever it might be our good fortune to find them.
We intend to start this program as soon as feasible. The best available linkage testers will be shared among the cooperators and we hope that at least the crosses preparatory to synthesizing improved stocks might be made during the coming season. This matter is presented here for your consideration. As with all TGC activities, your cements and suggestions would be greatly appreciated.
Coordinating Committee.