A GENETICO-PHYSIOLXGICAL STi'DY ON THE FilRMATION ETC. 



43 



(H) Apiciilus (if j^liuues oolonriMl, Imt leul'-slieatlis ci Joiirless. 



(4) Apiciilas of glumes ouly colonitifl. He douljts of classes .3 and 4 

 roiilly exist. Chtss 1 is the commonest gi-oup. Coutrarv to ludiau varieties, 

 the cxalom'less stigiim with gi'cou leaf-sheath is the most common type fuimd 

 in JjiiMiuese varieties. He observal further, thut the c<jl(>ur in the leaf-.sheatlis 

 and apiculus is dne to a colour factor R acting on a du'omogeu C, and that 

 the jmrple colour of the stigma is duo to a farther factor P not present in 

 the leaf-sheath and apiculus, and that the simultiineous presence of all three 

 fcwtoi-s liCP is necessai-y for the protluction of any sort in the stigma. Paenell, 

 Ranoasw^vmi, Agyaxgai;, and Raxi.vh (1917)' have shown that in certain Indian 

 varieties, the pui^ile lining of the iuternode is coupled with tlie purple glumes, 

 the purple stigma witli the praple axil (purple-coloui'iug of the epidermis on 

 the inside of the sheath) but the puiplo lining of the interuode and the purple 

 glume do not co-exist with the piu'ple stigma and the piurple axil. 



Among the Japanese varieties studied by the writer, most of those which 

 have a colom-ed stigma have a puiple awn and leaf-sheaths striped, and only 

 in certain varieties, they are separated. The distribution of authocjanin 

 in Japanese varieties is sho'(\ n in the following table. 



Table 18. 



Distribution of antliocynniu in the \arieties of .Tnianese rice. 



1. Pabxell, p. E.. Eangaswajii, Agtangae. G. N, and Rvniah. K., The Inheritance of 

 Characters in Kice I. Memoirs Depart. Agri. India. Bot. Series. 9 : 75, 1917. 



