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(American Journal of Botany. 2007;94:266-273.)
© 2007 Botanical Society of America, Inc.

Article

How robust is nonrandom mating in wild radish: do small pollen loads coupled with more competing pollen donors lead to random mating?1

Marieken G. M. Shaner2 and Diane L. Marshall

Department of Biology, University of New Mexico, Albuquerque, New Mexico USA

ABSTRACT

In previous studies of the weedy annual Raphanus sativus we have demonstrated that mating is nonrandom in greenhouse plants, suggesting that sexual selection is possible. To investigate how these greenhouse results might translate to conditions more similar to the field, we manipulated both pollen load size and the number of competing pollen donors on stigmas. While the smallest pollen loads (22 grains per stigma) were small enough to reduce fruit and seed set, seed siring success was unaffected by pollen load size. When the number of competing donors in a mixed pollination was increased to four, the proportion of seeds sired by the pollen donors was the furthest from expectation, suggesting that nonrandom mating increases as the number of donors per pollination increases. There was no significant interaction between pollen load size and number of competitors per pollination. Overall, mating remained nonrandom across all treatments. Thus differential seed paternity is likely to occur in the field as well as in the greenhouse.

Key Words: Brassicaceae • mate choice • nonrandom mating • pollen competition • pollen load size • Raphanus sativus • wild radish






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