Abstract
An attem, pt has been m, ade to analyse the variance 'of grain yield on Fl plant and of endosperm-germ ratio in 24 inbred lines and its hybrids in maize. The following conclusions were obtained from the data obtained. 1 ) . The increase of endosperm-germ ratio through fertilization by forelgn pollen was recognized pnly in few special - inbred lines, and not signifieant in m, ost of them... 2). In the both cases, grain yield on Fl plant and endosderm-germ ratio, it may be assum., ed that the heterosis should be appeared as a result of the. cum, ulative action of any two giveh alleles among genes of a m, ultiple allelomorphic series as suggested already by East (1936). 3). There seems ta be a barely significant correlation (r=0. 3) between the increases of endosperrD.-gerrc' ratio and of tlle abili ?? y of grain-yieldihg in hybred strain, becuse of the existence of a com, mon regres-sion within all of inbred lines. 4-). A fact that any one of inbred lines differes si*anificantly from the another on the am, ount of re-gression in the grain yield on F, plant and the endo-sperm, *germ ratio may be demonstrated as a result of possible combination between two independent factors, one for the a*fain yield and another for the endosperm-germ, rati.o. 5). The cause that the prediction of grain yielding ability for each inbred line by meahs of the lri:easure-ment on F1 plant of specific grain characters such s endosperm, -gorm ratio is in difficulty, was discussed
