Abstract
1. The gene concerning the abnormal ovary formation is designated as i (imperfect), its dominant allele as I which concerns the formation of the normal ovary; the gene concerning the non-lobed or entire petal is designated as e (entire), and its dominant allele as E, which concerns the bilobed condition of the petal. These two pairs of the genes are linked together with 1/4 recombination value. The linkage group has its locus in an autosome.
2. The presence of the gene concerning the removal of the inhibition of the ovary formation in the modified male plant is suggested; and it is located in an autosome.
3. The possibility of the linkage between the removal gene with Ii Ee alleles is considered.
4. It is suggested that the Y-chromosome-bearing macrospore in the modfied male plants is not viable, so that there is no egg cell having Y-chromosome, while either kind of microspore having Y- or X-chromosome is viable, as in the case of the true male. Therefore the ratio of the female to the male in the offsprings will be the same as that in the case of the crossing between the normal female and the true male.
5. The chromosome constitution in the nucleus of the modified male plant does not show any difference from that of the true male plants, as far as the morphological observations are concerned as BELAR maintains. The same thing can be said in regard to the chromosome constitution in the normal and abnormal female plants.
Here the writer wishes to express her sincere thanks to Prof. K. FUJII for his kind advise in the course of the investigation.
