Several mutable types have been isolated from virus exposed cultures. One of these has been designated Dt6 and is located on chromosome 4. The relation to Su su is indicated below:
Su Dt6 Su dt6 su Dt6 su dt6  
982 77 56 341 7.5% crossing-over

Three point tests involving the cross a su Gl3 dt6/a Su gl3 Dt6 were inconclusive, both gl3 and dt6 exhibiting independence with su but suggesting that Dt6 is proximal to su.

G. F. Sprague

Please Note: Notes submitted to the Maize Genetics Cooperation Newsletter may be cited only with consent of the authors.

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