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Seed set in the perennial larkspur Delphinium nelsonii is greater in crosses between plants growing an intermediate distance apart than in shorter and longer crosses. Since crossing distance is an attribute of a specific combination of parents, its effect on seed set represents an interaction of these parents, and since genetic similarity declines with physical distance in D. nelsonii populations, the interaction reflects parental genetic similarity. Understanding processes responsible for the effect is simplified if seed set differences result from prezygotic events, because in this case no inbreeding or outbreeding depression are involved. In 1990 we observed pollen tubes after performing crosses between plants separated by 1 m, 10 m, or 100 m, and found that the intermediate, 10 m crosses delivered the most tubes to the ovary
Knowledge graph centered on Crossing distance effects on prezygotic performanc with 7 nodes and 16 connections. Top connected: Delphinium, Nickolas M. Waser, Mary V. Price, Seed set and seed mass in <i>Ipomopsis aggregata</, Outbreeding depression varies among cohorts of <i>.
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