Abstract
Over a two-year period polyploidy was successfully induced by colchicine treatment in 10 varieties and selections of bunch grapes adapted to the northeastern United States, in one V. vinifera grape of California and in 16 muscadine grapes adapted to the southern United States. The technique and the identification of tetraploidy is described in detail. Chromosome doubling has insured fertility in some sterile hybrids in other species. Crosses will be attempted between tetraploids of bunch and muscadine grapes in the hope that fertile hybrids may result from these crosses.

This publication has 2 references indexed in Scilit: