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Timing of self-compatibility, flower longevity, and potential for male outcross success in Leptosiphon jepsonii (Polemoniaceae)¹

East Carolina University, Department of Biology, Greenville, North Carolina 27858 USA

ABSTRACT

When fertilization triggers flower senescence, early autonomous selfing may cause flowers to senesce before pollen has dispersed, discounting unused pollen. Selfing-induced flower senescence was examined in Leptosiphon jepsonii, a species that varies in the timing of self-compatibility. In field and greenhouse experiments, fertilization had a large effect on flower senescence; most outcrossed flowers senesced after 1 d whereas emasculated flowers lasted 2–5 d. In a comparison of inbred lines from three populations, longevity of autonomously selfed flowers of early self-compatible individuals was significantly less than that of late self-compatible individuals. In field experiments, autonomously selfed flowers were shorter-lived in a predominantly early-selfing population than in a predominantly late-selfing population. Pollen was available and viable beyond the first day of anthesis, suggesting that reductions in flower longevity caused by autonomous selfing could incur a cost to male outcross fitness. We argue that this effect is likely to be most pronounced under intermediate rates of pollinator visitation. Observed pollinator visitation rates ranged from 0.035–0.775 visits per flower per day, indicating a potential for selfing-induced flower senescence to incur pollen discounting in Leptosiphon jepsonii.

Key Words: flower senescence • mating system • Polemoniaceae • pollen discounting

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