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Mechanisms of differential pollen donor performance in wild radish, Raphanus sativus (Brassicaceae)¹

² Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131 USA; and ³ Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, Colorado 80309-0334 USA

In order to understand the characters on which sexual selection might operate in plants, it is critical to assess the mechanisms by which pollen competition and mate choice occur. To address this issue we measured a number of postpollination characters, ranging from pollen germination and pollen tube growth to final seed paternity, in wild radish. Crosses were performed using four pollen donors on a total of 16 maternal plants (four each from four families). Maternal plants were grown under two watering treatments to evaluate the effects of maternal tissue on the process of mating. The four pollen donors differed significantly in number of seeds sired and differed overall in the mating characters measured. However, it was difficult to associate particular mechanistic characters with ability to sire seeds, perhaps because of interactions among pollen donors within styles or among pollen donors and maternal plants. The process of pollen tube growth and fertilization differed substantially among maternal watering treatments, with many early events occurring more quickly in stressed plants. Seed paternity, however, was somewhat more even among pollen donors used on stressed maternal plants, suggesting that when maternal tissue is more competent, mating is slowed and is more selective.

Key Words: Brassicaceae • mate choice • pollen competition • Raphanus sativus • seed paternity • sexual selection • wild radish

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