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- W2089929587 abstract "Selection on male function has been invoked to explain various floral features, including number of flowers, flower size, and flower color. Here I describe two experiments designed to examine the efficiency of distyly in promoting male floral function, as measured by successful pollen dispersal to stigmas. In both experiments, I performed emasculations to control the type of pollen locally available in a natural population of Psychotria suerrensis , a tropical shrub. In the “natural‐recipients” experiment, I allowed each floral morph to donate pollen on alternate days to emasculated flowers of each morph. In the “paired‐recipients” experiment, I attached paired cuttings of each morph to individual donor plants. The results of both methods were consistent. Pollen borne on low anthers (from pin plants) was transferred most efficiently to low stigmas (on thrum plants). Pollen borne on high anthers (from thrum plants) was dispersed in equal amounts to flowers of both morphs. The results suggest that distyly is only partially effective in achieving efficient pollen donation. Male function of pins is enhanced by the polymorphism, but male function of thrums is not. A supplemental pollination experiment illustrates that seed set in this species is predominantly pollen limited, reducing the importance of male function, in comparison with species where seed set is primarily resource limited." @default.
- W2089929587 created "2016-06-24" @default.
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- W2089929587 date "1995-11-01" @default.
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- W2089929587 title "Pollen donation patterns in a tropical distylous shrub (<i>PSYCHOTRIA SUERRENSIS;</i> RUBIACEAE)" @default.
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- W2089929587 doi "https://doi.org/10.1002/j.1537-2197.1995.tb12675.x" @default.
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