THE INFLUENCE OF GIBBERELLIN ON THE FLOWERING OF CARROTS

Abstract

Application of aqueous solutions of gibberellin to carrots in greenhouse and muck soils in the field at Michigan State University, East Lansing, Michigan, indicated that five to six treatments of gibberellin at 100 and 1000 p.p.m., commencing when six to eight leaves had been initiated, induced earlier and a higher percentage of flowering plants. Fewer or more treatments at later stages of development resulted in slower and later responses. Following a warm spring gibberellin might be used as an aid in selection of non-bolting genetic lines in a carrot-breeding program, as plant populations with a bolting tendency respond much more vigorously than those which are characteristically non-bolting.