Distance between mates affects seedling characters in a population of Impatiens capensis (Balsaminaceae)

Journal Article (Journal Article)

Tested for the presence of an optimal outcrossing distance in a population of Impatiens capensis, an annual herb that possesses a mixed mating system, by measuring fitness components for offspring of parents that were separated by distances of 2, 20 or 50 m. Heavier seed weights and later seed maturation enhanced probabilities of emergence and subsequent survival, but emergence and survival were unaffect by outcrossing distance. Seeds that were produced late in the season were heavier than early seeds, and late seeds germinated at later dates. Although late germination dates were associated with taller plants after 1 and 3 months of growth, late germination resulted in lighter dry weights at maturity. Distance between parents had a negative direct effect on seed weight but a positive effect on height after 1 month. Data imply an optimal outcrossing distance for height at 1 month, estimated as 29 m, but path analysis suggests that the apparent optimum is due to a negative correlation between the interparent distance and seed weight. -from Authors

Full Text

Duke Authors

Cited Authors

  • McCall, C; Mitchell-Olds, T; Waller, DM

Published Date

  • January 1, 1991

Published In

Volume / Issue

  • 78 / 7

Start / End Page

  • 964 - 970

International Standard Serial Number (ISSN)

  • 0002-9122

Digital Object Identifier (DOI)

  • 10.2307/2445175

Citation Source

  • Scopus