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Under how wide a set of conditions will nonrandom mating occur in Raphanus sativus (Brassicaceae)?¹

Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131 USA

Studies of the weedy annual Raphanus sativus have demonstrated that nonrandom mating, a prerequisite for sexual selection, can occur in greenhouse plants. To determine whether this nonrandom mating pattern can occur under a wide range of conditions, including conditions that might occur in the field, we considered variation in both maternal condition and pollen load size. Maternal condition was varied by altering the watering regime. Pollen load size was varied from approximately 26 to 343 pollen grains per stigma. At the smallest pollen load size, patterns of seed paternity were altered in two of the three pollen donor pairs; seed paternity became more equal among donors. For one of three pollen donor pairs, seed paternity was more divergent among donors on stressed maternal plants. Finally, for one pollen donor pair, rank order of pollen donor performance changed from the medium to the small pollen loads on stressed vs. control maternal plants. Thus, some field conditions may alter patterns of nonrandom mating in wild radish.

Key Words: Brassicaceae • maternal stress • nonrandom mating • pollen competition • pollen load size • Raphanus sativus • wild radish

This article has been cited by other articles:

				M. G. M. Shaner and D. L. Marshall How robust is nonrandom mating in wild radish: do small pollen loads coupled with more competing pollen donors lead to random mating? Am. J. Botany, February 1, 2007; 94(2): 266 - 273. [Abstract] [Full Text] [PDF]