Sex ratio, components of reproduction, and pollen deposition in Lindera Benzoin (Lauraceae)
Sex ratio, components of reproduction, and pollen deposition in Lindera Benzoin (Lauraceae)
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安息香（樟科）的性别比、繁殖成分和花粉沉积
DOI：
10.1002/j.1537-2197.1992.tb14584.x
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发表时间：
1992
影响因子：
3
通讯作者：
R. Niesenbaum
中科院分区：
文献类型：
--
作者：
R. Niesenbaum
性别比例；花、花粉、胚珠和果实的生产；花粉沉积；在阳光和阴凉栖息地的雌雄异株灌木安息香乌药种群中测量了授粉昆虫的丰度。阳光下和阴凉处的性别比例均为1:1。在两种栖息地类型中，阳光下的花朵产量高于阴凉处的花朵产量，雄性植物的产量高于雌性植物的产量。阴凉处花粉与胚珠的种群水平比（P/O）大于阳光下的，但传粉媒介丰度是花粉沉积的比 P/O 更重要的决定因素。虽然300/o-70%的柱头没有收到花粉，但更大比例的花没有结果，并且在阳光下的坐果率比在阴凉处的坐果率更高。由于周期性间隙形成而增加的光照可能通过影响雄性和雌性植物的繁殖分配模式，在这种林下灌木的繁殖生态学中发挥重要作用。当每种性别的繁殖所需的成本或资源不同，以及限制资源的可用性在空间上变化时，某些雌雄异株的植物物种中可能会出现性别比变化（Putwain和Harper，1972；Freeman，Klikoff和Harper，1976；Grant和Mitton，1979；Onyekwelu和Harper，1979；Freeman，Harper和Charnov，1980；Dawson和极乐，
Sex ratio; flower, pollen, ovule, and fruit production; pollen deposition; and pollinator abundance were measured in populations of the dioecious shrub Lindera benzoin occurring in sun and shade habitats. Sex ratio was 1:1 in both the sun and shade. Flower production was greater in the sun than in the shade, and greater for male plants than for females in both habitat types. The population level ratio of pollen to ovules (P/O) was greater in the shade than in the sun, but pollinator abundance was a more important determinant of pollen deposition than P/O. Although 300/o-70% of stigmas received no pollen, an even larger proportion of flowers did not set fruit, and fruit set was greater in the sun than in the shade. Increased illumination due to periodic gap formation may play an important role in the reproductive ecology of this understory shrub by affecting patterns of allocation toward reproduction in male and female plants. Sex ratio variation can occur in some dioecious plant species when the costs or resources required for reproduction are different for each gender, and when the availability of limiting resources varies spatially (Putwain and Harper, 1972; Freeman, Klikoff, and Harper, 1976; Grant and Mitton, 1979; Onyekwelu and Harper, 1979; Freeman, Harper, and Charnov, 1980; Dawson and Bliss,