Genetic Studies of some Characters in Pisum. 



(Preliminary note) 

 By 



Sigeroku Xohara. 



Before and after the time of Mendel experimental researches 

 on Pisum have been carried on by many investigators and 

 among them Knight, Gartner, Mendel, Correns, Bateson, 

 Lock, Tschermak, Darbishire, Saunders, Punnett, Gregory, 

 Hurst, Pellew, Keeble, Vilmorin are noted. Recently White 

 in America made extensive experiments on Pisum and Hoshino 

 in Japan has made public the results of his experiments on the 

 inheritance of the flowering time of peas. 



The characters dealt with by these investigators are con- 

 cerned with visible ones at the outset such as flower color 

 (purple and white), stature of stem (tall and dwarf), cotyledon 

 color (green and white) and the like. Recently I repeated the 

 experiments with several characters of the same plant and I 

 hit on a peculiar character on texture of pod, i.e. the production 

 of hard pod through crossing of two different kinds of Pisum 

 which produce soft edible pod. The one is Japanese Sirrendo 

 (white pea) and the other Sugar pea or Sans Parchcmin ..res 

 large Cosse of Vilmorin. 13 



Both of these kinds produce pods of the same texture of 

 good quality to eat as they do not develop parchment-like 



lining in the pod while they are young (as the name of the 



1) For the sake of brevitj I will designate " Jap ine -•■ " and " French " reap* otively. 

 I am ii moli indebted t.. Mr. K. X:igai of horticultural experiment station al <>kitu 

 in identifying this " French." 



