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• W2047048728 abstract "Pollen allelopathy occurs when pollen toxins inhibit sexual reproduction in heterospecifics. To quantify pollen allelopathic effects in vitro, pollen of Hieracium aurantiacum, H. floribundum , and H. pratense was extracted with double distilled water into concentrations of 0 (control), 0.1, 1, 3, 5, 10, and 25 pollen grains/ μ l. A subset of these extracts was partitioned by ion‐exchange chromatography into acidic, basic, and neutral fractions. Pollen from six sympatric species of Fabaceae ( Lotus corniculatus, Medicago sativa, Trifolium hybridum, T. pratense, T. repens, Vicia cracca ) and the species of Hieracium was germinated on agar media containing different extract concentrations. As extract concentrations from intact pollen or from acidic fractions increased, mean percent germination of pollen of all Fabaceae decreased nonlinearly. Extract concentrations of 0.1 grains/ μ l and above inhibited pollen germination in the Fabaceae. In no case was any Hieracium species affected, i.e., there was no autotoxicity. Similar results were obtained using plants from nine populations of H. floribundum and H. pratense across eastern Canada. Observation of floral visitors indicated that there were relatively few movements between Hieracium and the Fabaceae (about 15% of total visits). Hence there is limited opportunity for heterospecific pollen transfer. This was consistent with censuses of stigma, i.e., few pollen grains of Hieracium were found on stigma of the Fabaceae. Thus, pollen allelopathy in Hieracium is unlikely to affect reproductive success in these six species of Fabaceae." @default.
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• W2047048728 date "1995-01-01" @default.
• W2047048728 modified "2023-09-26" @default.
• W2047048728 title "In vitro allelopathic effects of pollen from three<i>Hieracium</i>species (Asteraceae) and pollen transfer to sympatric Fabaceae" @default.
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• W2047048728 doi "https://doi.org/10.1002/j.1537-2197.1995.tb15646.x" @default.
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