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(American Journal of Botany. 2005;92:1871-1877.)
© 2005 Botanical Society of America, Inc.

Reproductive Biology

Inbreeding depression and selfing rate of Ipomoea hederacea var. integriuscula (Convolvulaceae)1

Helen M. Hull-Sanders2,5, Micky D. Eubanks3 and David E. Carr4

2University of Wisconsin–Milwaukee, Field Station, 3095 Blue Goose Rd., Saukville, Wisconsin 53080 USA; 3Auburn University, Department of Entomology, 301 Funchess Hall, Auburn, Alabama 36849 USA; 4University of Virginia, Blandy Experimental Farm, 400 Blandy Farm Ln., Boyce, Virginia 22620 USA

ABSTRACT

Inbreeding depression and selfing rate were investigated in the self-compatible vine Ipomoea hederacea to assess the variability of the breeding system. Inbreeding depression differed between populations and the magnitude varied at germination, growth (as measured by aboveground biomass), and reproductive potential. Plants from Macon County, Alabama, USA, had significant inbreeding depression (31%) at germination, but no significant inbreeding depression for aboveground biomass or number of reproductive structures (buds and flowers) at 45 d post germination in the greenhouse or in the field. Plants from Morgan County, Alabama, however, had significant inbreeding depression (>50%) for all three stages in the greenhouse. In allozyme comparisons, five of the 11 I. hederacea populations surveyed had high selfing rates (66.66–92.53%) and high levels of homozygosity (FIS = 0.500–0.861) in 2003, and three of four populations surveyed in 2004 had selfing rates that exceeded 50%. High selfing rates, high levels of homozygosity, and low levels of inbreeding depression suggest that inbreeding depression may not present a significant barrier to the transmission of selfing alleles in some populations of I. hederacea, but does not account for the maintenance of a mixed mating system in other populations.

Key Words: allozyme • inbreeding depression • Ipomoea hederacea • mixed mating system • self-compatible






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