Floral sex allocation in a hermaphrodite herb with 1‐day flowers, Hosta rectifolia (Liliaceae)
Floral sex allocation in a hermaphrodite herb with 1‐day flowers, Hosta rectifolia (Liliaceae)
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DOI：
10.1111/j.1442-1984.2007.00191.x
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发表时间：
2007-12
影响因子：
1.4
通讯作者：
Guo‐Xing Cao;G. Kudo;Takashi Y. Ida
中科院分区：
文献类型：
--
作者：
Guo‐Xing Cao;G. Kudo;Takashi Y. Ida
大小依赖的性别分配理论预测，在昆虫授粉的雌雄同体植物中，随着资源地位的提高，以雌性为基础的性别分配加速。然而，花间交配环境的变化，这是由传粉者的运动和花的性比的时间波动，可能会导致不同的模式在花序内的花之间的性别分配。我们研究了花的性别分配之间的植物和花的花序中的一个多年生雌雄同体的物种，1天的花，玉簪rectifolia Nakai。在花序内，开花顺序地从基部到远端位置进行，花之间几乎没有开花重叠。在植株水平上，每朵花的花粉和胚珠产量都随着植株的大小而增加。在花序内，胚珠和花粉产量每花下降，从基部到远端的位置，表明每花资源的可用性下降。在自然条件下坐果成功的概率也从基部到花序内的远端位置的花减少。然而，单个花的花粉胚珠比例保持不变，无论花的位置和植物的大小。恒定的性别分配在花的水平是一致的交配环境理论的预测，每一个定位花似乎有一个类似的潜在的授粉成功，因为没有geitonogamous授粉。
The size-dependent sex allocation theory predicts that a female-based sex allocation is accelerated with increasing resource status in insect-pollinated hermaphrodite plants. However, variations in the mating environment among flowers, which are caused by pollinator movements and temporal fluctuation in the floral sex ratio, may cause diverse patterns in sex allocation among flowers within inflorescences. We examined the floral sex allocation among plants and among flowers within inflorescences in a perennial hermaphrodite species with 1-day flowers, Hosta rectifolia Nakai. Flowering progresses sequentially from basal to distal positions within an inflorescence with little flowering overlap among flowers. At the plant level, both pollen and ovule production per flower increased with plant size. Within inflorescences, both ovule and pollen production per flower declined from basal to distal positions, indicating decreasing resource availability per flower. The probability of fruit-set success under natural conditions also decreased from basal to distal positioned flowers within inflorescences. However, the pollen to ovule ratio of individual flowers remained constant, regardless of floral position and plant size. Constant sex allocation at the flower level is consistent with the prediction of the mating environment theory; every positioned flower seemed to have a similar potential of pollination success because there was no geitonogamous pollination.