MATING COST OF LARGE FLORAL DISPLAYS IN HERMAPHRODITE PLANTS
MATING COST OF LARGE FLORAL DISPLAYS IN HERMAPHRODITE PLANTS
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DOI：
10.1038/373512a0
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发表时间：
1995-02-09
期刊：
影响因子：
64.8
通讯作者：
BARRETT, SCH
中科院分区：
文献类型：
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作者：
HARDER, LD;BARRETT, SCH
雌雄同体包括当雄性和雌性器官接近允许自体受精(1)和性功能之间的干扰(2)时的异型杂交。正如达尔文所认识到的(4-6)，动物授粉被子植物的许多花性状都鼓励异花受精(3)；然而，这些特征也可能允许同一个体上的花之间授粉（同性受精自花授粉）(7,8)。同时展示许多鲜花就体现了这种冲突。尽管大型花卉展示通过增强授粉媒介吸引力促进异型杂交(9)，但如果同性受精通过减少植物之间的花粉转移（花粉折扣(12)）而降低异型杂交的繁殖成功率，那么它们可能会因失去交配机会而付出高昂代价(10,11)。我们在此报告，在操纵蜜蜂授粉的凤眼莲植物的花数后，我们观察到较大花序的预测较高的自交和较低的异交繁殖成功率。考虑到当一朵花接收花粉干扰另一朵花的花粉输出时导致适应性下降，我们建议扩大对花卉设计和展示的传统解释，以认识到它们在减少同性受精花粉折扣中的作用。
HERMAPHRODITISM comprises outcrossing whenever the proximity of male and female organs allows self-fertilization(1) and interference between sexual functions(2). Many floral traits of animal-pollinated angiosperms encourage cross-fertilization(3), as recognized by Darwin(4-6); however, these characteristics may also allow pollination between flowers on the same individual (geitonogamous self-pollination)(7,8). Simultaneous display of many flowers exemplifies this conflict. Although large floral displays promote outcrossing through enhanced pollinator attraction(9), they could be costly in terms of lost mating opportunities(10,11) if geitonogamy decreased outcrossed siring success by reducing pollen transfer between plants (pollen discounting(12)). We report here that, after manipulating the flower number of bee-pollinated Eichhornia paniculata plants, we observed the predicted higher selfing and lower outcrossed siring success for larger inflorescences. Given the reduced fitness resulting when pollen receipt by one flower interferes with pollen export by another, we propose broadening traditional interpretations of floral design and display to recognize their roles in reducing geitonogamous pollen discounting.