Volume XI APRIL, 1921 No. 1 



STUDIES OF INHERITANCE IN THE JAPANESE 

 CONVOLVULUS. PART II. 



By B. MIYAZAWA 



(With One Coloured Plate.) 



INTRODUCTION. 



Since the culture experiments ending with 1918 have led me to 

 certain definite conclusions in respect to the hereditary behaviour of 

 various shades of flower-colours which appear in the F.2 generation, and 

 which were shortly noticed in my previous paper^ I should like to describe 

 below the results of these experiments. In my previous article I have 

 mentioned the fact that yellow plants never bear dark-red flowers, but 

 recently I was able to get a yellow-leaved race which nevertheless pro- 

 duces dark-red flowers ; and as I have conducted hybridisation experiments 

 between such a race and each of the two original parents, the results 

 so far obtained will be given also in this paper. 



First of all, I will mention here briefly some results obtained by 

 many investigators as regards the inheritance of flower-colours which 

 seem to have special relations with my own studies. 



Bateson and Punnett^ reported in Lathyrus odoratus several cases 

 where the flower-colour presented by neither parent appears in ^i or in 

 and after F^_. Saunders'* found in Matthiola that certain two white- 

 flowered individuals crossed together gave coloured F^, and such a case 

 was also reported by Marryat^ and by Takezaki^ in Mirahilis and Japanese 

 Convolvulus, respectively. Saunders" obtained purple-flowered F^ between 

 pink and white varieties of Salvia Horminum, and in F.2 the ratio was 



1 Journal of Genetics, Vol. viii. No. 1, p. 62, 1918. 



2 Beports to the Evolution Covimittee of the Royal Society. II. pp. 83 — 99, 1905. 



3 L.c. I. p. 45. 

 ^ \ ^ L.c. V. p. 46. 



Osl ^ " Nippon Ikusyugakukwai Kwaiho " (Journal of the Japanese Breeders'' Association), 

 ^I. 1, Tab. V and VI. 1916. 



6 Heports to the Evolution Committee of the Royal Society, 1905. II. p. 50. 



T-H Jouin. of Gen. xi 1 



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