Results from inoculating the A158 teosinte derivatives developed many years ago by Mangelsdorf show that the A158 Dur 1, 7, 9 stock carries a high level of resistance to Cercospora zeae-maydis, gray leaf spot disease. The A158 control and the various other teosinte derivatives were all highly susceptible. We assume that the resistance factor was introduced on one of the three chromosomes transferred from Durango teosinte. Although this teosinte is apparently now extinct, the maintenance of its A158 derivatives at Waltham has allowed its post-mortem contribution.
In order to identify which of the three chromosomes carries the resistance gene, we have crossed the Dur 1, 7, 9 derivative with the WMT marker stock. The F2 populations will be screened by Frances Latterell using the P p (red vs. white cob) marker for chromosome 1, the Gl gl (non-glossy vs. glossy seedling) for chromosome 7 and Wx wx (non-waxy vs. waxy endosperm) for chromosome 9.
Walton C. Galinat and Frances M. Latterell
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