Pollination biology of the saprophytic speciesPetrosavia sakuraii (Makino) van Steenis in Central Japan
Pollination biology of the saprophytic speciesPetrosavia sakuraii (Makino) van Steenis in Central Japan
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日本中部腐生物种 Petrosavia sakuraii (Makino) van Steenis 的授粉生物学
DOI：
10.1007/bf02344587
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发表时间：
1993
影响因子：
2.8
通讯作者：
H. Hayashi
中科院分区：
文献类型：
--
作者：
Hiroshi Takahashi;E. Nishio;H. Hayashi
研究了日本中部腐生植物樱石竹的传粉生物学。花在一天中的任何时间开放，外雄蕊的花药大约在一天后裂开，内雄蕊的花药在两天后裂开。半圆（近离圆）雌蕊上的柱头，在花开放时已经受花，位于花的中心，并在花后大约5天逐渐向外移动，接触到外部雄蕊的花药。育种试验表明，柱头至少可接受5天，许多种子是通过自主自花授粉产生的。这意味着处于原始状态的近离生雌蕊适应于自主自花授粉。包括昆虫自花授粉在内的自花率非常高，这种有性生殖系统似乎有利于腐生植物，但其资源可能受到严重限制。然而，异花授粉也可以由Lasioglossum的小蜜蜂和其他一些昆虫来完成，即使它们不经常访问花朵并且异交率很低。
Pollination biology of the saprophytic speciesPetrosavia sakuraiiwas investigated in Central Japan. The flower opens at any time of the day, and the anthers of outer stamens dehisce after about one day and those of the inner stamens after two days. The stigmata on the semicarpous (nearly apocarpous) pistil, which are already receptive when the flower opens, are situated in the center of the flower and move gradually outwards to touch the anthers of outer stamens about five days after anthesis. The breeding experiments show that the stigmata are receptive at least for five days, and many seeds are produced through autonomous self-pollination. That means the nearly apocarpous pistil, which is in a primitive condition, is adapted to the autonomous self-pollination. The selfing rate including insect-mediated self-pollination is very high, and this sexual-reproductive system seems favorable to the saprophytic plant which is probably severely limited in its resources. However, cross-pollination also may be performed by the small bees of Lasioglossum and some other insects, even though they do not so frequently visit the flowers and the out-crossing rate is low.