Analysis of variance of the endosperm-germ ratio and of the F1 yield of grains in inbred lines and its single crosses in maize.

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