Reproductive Isolation in a Native Population of Petunia sensu Jussieu (Solanaceae) |
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Authors: | Ando Toshio; Nomura Masashi; Tsukahara Jun; Watanabe Hitoshi; Kokubun Hisashi; Tsukamoto Tatsuya; Hashimoto Goro; Marchesi Eduardo; Kitching Ian J |
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Institution: | Faculty of Horticulture, Chiba University, 648 Matsudo, Chiba Prefecture, 271-8510, Japan Centro de Pesquisas de História Natural, 618 Rua Jaime Ribeiro Wright, Itaquera, São Paulo, 08260-070, Brazil Facultad de Agronomia, Universidad de la República, Garzón 780, Montevideo, Uruguay Department of Entomology, The Natural History Museum, London, SW7 5BD, UK |
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Abstract: | Reproductive isolation was studied in four syntopic speciesof Petunia sensu Jussieu (Solanaceae) at a site in Rio Grandedo Sul State, Brazil. Reciprocal artificial crossing experimentsconfirmed that a genetic barrier exists between Petunia(P. axillarisand P. integrifolia) andCalibrachoa (C. parviflora and C. heterophylla),and also between C. parviflora andC. heterophylla . Petuniaaxillaris(white, nocturnally scented flower) is geneticallycompatible with the syntopic and allotopic P. integrifolia(coloured,unscented flower). Reproductive isolation appears to be maintainedby the two species having different pollinators: nocturnallyactive hawkmoths (Manduca contracta andM. diffissa subsp. petuniae)pollinate P. axillaris while a diurnally active bee (Hexanthedasp.) pollinates P. integrifolia. Flowers of P. integrifoliaexhibit diurnal opening and closing movements synchronous withthe activity period of the bee. Other than a probable nectarrobber (a carpenter bee, Xylocopa augusti), no insect visitedflowers of P. axillaris in the day. Amounts of floral nectarin P. axillaris and P. integrifolia were within the range ofhawkmoth- and bee-pollinated flowers, respectively. Reproductiveisolating mechanisms in the genus Petunia sensu Jussieu arediscussed. Copyright 2001 Annals of Botany Company Calibrachoa, hawkmoth, Petunia, Petunia axillaris, Petunia integrifolia, pollinator, reproductive isolation, Solanaceae |
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