96 



I'll YSIOLOGICAL GENETICS 



cyanin, peonin, petunin, malvin, and delpbin arc all 3-5 glycosides 

 respectively of the pelargonidin, etc. 



Mutations in flower color may be based on the different pos- 

 sible changes in regard to the anthocyanin formula, the copig- 

 ment, and the pH. The chemical change may be of many 

 different types. By way of illustration, we mention only a 

 single type, where the mutated gene prevents the methylation of 

 the complex, as shown below; 



CI 

 O 



CI 



oh/V^s 



O.CH 3 

 ^>OH 



5/ 



O.CoH u 6 

 OH 

 Malvidin-3-nionoside 



CH 3 



O.CeHnOt 

 OH 



Pelargonidin-3-monoside 



The following extract from Scott-Moncrieff's table for Primula 

 sinensis indicates some of the different types of action of some of 

 the genes. Wild type is magenta by malvidin-3-monogalactaside 

 (primulin) copigmented by anthoxanthin (pH 5.3). 



Table 10 



(From Scott-Moncrieff) 



