Genetie studies on Cosmos bipinnatus. : VI. development of flower-heads by the action of flower-type genes. ( 2 ) In doubled types.

Abstract

Comparative studies on the morphological development of rays in the various flower-types were reported in a previous paper (SAMATA, 1962). Emphasis in the present paper is placed upon the comparison of disk development with special reference to the action of genes on the expression of disks. Materials used in this experiment were the single type, doubled types of different degrees of specialization and the pompon-doubled type.