ホテイアオイの生態学的研究 : 第3報開花,受粉,結実に関する調査

概要

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In order to analyse the mechanism of seed propagation in water hyacinth occurring in the southern part of Japan, the formation of capsules and seeds was studied. The results are summarized as follows: 1. Capsule setting percentage through two seasons ranged from 0 to 9 % by open pollination, while that by artificial pollination ranged from 0 to 97%, with an average of 56%. 2. Pollen fertility was high in summer, and pollen grains germinated well on the agar medium at 20 to 40℃, with maximum germination at 30℃. 3. The low capsule setting percentage by open pollination was mainly attributable to the fact that the pistils could hardly receive pollen grains under natural conditions. 4. It was considered that self-pollination did not play a significant role because anther dehiscence was not observe before flowering, and only a few pollen grains were dispersed during the flowering period under natural conditions. 5. On the other hand, the probability of pollination by insects also seems quite low, because visit of insects was not observed.
1986-05-26