Abstract
The distinct difference was detected with regard to the appearance of flower color pattern among varieties and strains of Petunia hybrida.
One clone in the variety, Star Dust (blue strain), having a wide variation in the type of flower color pattern was selected, propagated by stem cuttings and used as materials.
During cool season many corollas striped in white in a magenta background put in an appearance and some corollas became white.During hot season many ones starred or colored appeared.
At a constant temperature 25°C in the phytotron, many corollas starred or colored appeared. On the other hand at a constant temperature 18°C many ones striped did.In the poor light condition at an intensity of 73 per cent of the full sunshine, the corollas colored or starred increased, while in the full sunlight the ones colored or starred decreased.From these the main effect of temperature and light intensity on the appearance of flower color pattern was considered to be of high significance.Further the interaction between these two factors was also significantly greater.For example, about 78 per cent of corollas colored appeared in the condition maintained at 25°C and in the poor light.
It may be suggested that the climatic requirement for the variation of flower color pattern appears to be independent of the one for the formation of anthocyanin.
