カンランの不和合性現象の一新例

抄録

A new case of incompatibility observed in, a variety of cabbage, "Summer". Brassica oJeracea L., is reported in this paper. Self and mutual crosses in every direction among 5 plants were made. These 5 plants numbered as l, 2, 3, 4 and 5, were obviously self incompatible giving only very few seeds on selfing. They proved to form 3 intrasterile groups, A (1), B (2 and 4) and C (3 and 5), whose relationships 'are shown: in the upper left part of Table I and Fig. 1 The incdmpatibility behaviors of the progenies obtained from selfing can be reviewed also in Table 1. Those of the progenies originated from mutual crosses are shown in Table 2. Discussions were made to the effect that. none of the hypotheses posturated hitherto by several workers could explain the results here obtained. Only GERSTEL.'s hypothesis, which in one hand assumes epistacy among 'oppositional factors and sporophytic reaction in the other, seems to be partly applicable. It can explain therelationships amang the 3 groups, but it fails to make out the behaviors of the progenies. From the obvious secondary polyploid nature of the cabbage genome the authors have deviced a new scheme of tetraploid o, ppositional factor constitutions (see Fig. 2). This not only allows the existence of the 3 groups, but alsa can explain the incompatibility phenomena displayed by the prqgenies fairly well. However, it fails also to give full explanation of the facts.