5. Effect of C30 on the production of new mutants.

In the cross of P39 × C30 several cases of defective and germless seeds have been encountered. The number of segregating progenies has been small and consequently no rate has as yet been determined. It is our belief that a rate exceeding the normal mutation rate will be found when more data are accumulated.

Besides germless and defective seeds, a virescent seedling was found to be segregating in a selfed progeny of the cross P39 × C30. No such virescents have been observed in either P39 or C30. The virescent when selfed produced 100% virescent seedlings. The inheritance of the new virescent will be determined. Also P39, C30 and the F₁ hybrid will be examined cytologically.