Abstract
Among offsprings of Strain 056 of Japanese morning glory which is assumed to have dominant gene Blown (B) and recessive genes delicate (dl) and feathered (fe), and also those of Strain 058 assumed to have genes Blown and feathered, we found many individuals showing tumor-like shoot development at cotyledonary stage. As the result of the observation of those individuals, the coexistence of Blown and feathered genes in homozygous condition is considered to be connected with the occurrence of the tumor.
In vitro tumor tissues grew slowly on modified White's agar medium but the addition of yeast extract stimulated the growth considerably.
In the in vivo tumor tissues, we found irregular configurations of vascular elements.
