Abstract
Buckwheat flowers are dimorphous, and cross-pollination by means of heterostyly is ensured, and it is generally acknowledged that legitimate pollination is effective and illegitimate pollination and self-pollination are less effective. Usually speaking, a buckwheat plant has hundreds of flowers, but only ten or thirty per cent of those develope into matured grains, and another flowers fail to be fertilized or blast at the early stage of maturation. The present studies were carried out on the fruiting ability of flowers according to the location on inflorescense, and fruiting ability was indicated by fertilizing percentage and brasting percentage. (1) Buckwheat plant has 1-5 primary branches, those have several secondary branches, and each seondary branch has several flower bunches. (Ref. Fig. 1) (2) There is no remarkable difference in fruiting ability among primary branches, but mean flowering date of the flowers is a little earlier and fruiting ability is a little higher in upper branch than in lower branch. (3) Among the secondary branches on a primary branch, there was the evident difference, and the fifth or sixth secondary branch was earliest in average flowering date and most vigorous in fruiting ability. (4) Among the flower bunches on a secondary branch, fruiting ability was most vigorous and average flowering date was earliest in lowest bunch. (5) Among the flowers of a branch, the flowering date of the flower was earlier, the fruiting ability more vigorous.
