Abstract
Seed characteristics were compared between common (C) and early (E) types of Chigaya as a basic study for their seed propagation. The latter type of the species was distinguished from the former one by the authors depending on its glabrous node, larger seed, and early flowering. The materials used were collected from the different localities and years for both types. Mean fertility of seeds was significantly higher and less variable in E- than in C-type. Consequently, greater number of fertile seeds per panicle were consistently produced in E-type regardless of the differences of collecting sites, localities and years. As for seed germinability, no dormancy, in effect, was recognized with either type. The seeds were easily germinated under the optimal conditions, around 30°C with light. However, the temperature range for germination was greater, and the requirement of light was less in E- than in C-type. Moreover, the germination rate was clearly higher in E-type. Accordingly, the germination requirements of E-type are considered to be less rigid than those for C-type. Seed longevity for both types was markedly prolonged by dry-chilled storage, though it was presumed to be several months in the case of the room storage. From the results mentioned above, E-type of the species is considered preferable to C-type in so far the propagation by seeding is concerned.
