2005 Volume 50 Issue 4 Pages 276-283
The purpose of these experiments was to determine the relationship between that the seed coat colors, the position effects, the seed shapes, the dehiscence grades of the capsules and the seed coat crack of Iris pseudacorus and the germination characteristics of seeds that come into emergence in autumn. In the seeds which were floating the water surface, compared with the brown seed and black seed, the white seed had a little deep dormancy. The differences of dormancy depending on a position effect, a seed shape, and differences resulting from a dehiscent time were little, so it was considered that the relevance with autumn emergence is low. Dormancy of the seed remaining in dehiscence capsules became deeper under airdried storage of the room temperature conditions, and the breaking of dormancy was enhanced by 5°C wetstorage. However, at a field test, there was no correlation between the rate of the emergence and the dehiscence grades of the capsules. The emergences mainly occurred in the next spring after seed ripening, but some of seeds germinated at the rate of 2-16% in the autumn of the ripened year. The seed in which seed coat cracked germinated earlier, and it was shown that their cumulative germination percentage was high even under 30°C constant conditions. Therefore, it was thought that the seed in which seed coat cracked had contributed to the autumn emergence greatly.
