THE INFLUENCE OF THE GROUP-1 CHROMOSOMES OF WHEAT ON EAR-EMERGENCE TIMES AND THEIR INVOLVEMENT WITH VERNALIZATION AND DAY LENGTH

By using aneuploid lines of wheat in the variety Chinese Spring, each of the homoeologous group 1 chromosomes was found to delay ear emergen ce. More than one gene per chromosome was probably involved, and, beca use of the delays in ear emergence, at least one of them may be respon sible for producing an inhibitor of flowering. The genes interacted wi th each other and with vernalization and day length. The genes on chro mosome 1A were the most potent and 1B the least. The genes on the grou p 1 chromosomes may be related to the genes for vernalization and day- length sensitivity found on the homoeologous chromosome 1H of barley. Reciprocal monosomic analyses of three varieties detected allelic vari ation between homologues of group 1 for ear-emergence time.