In response to Fred Lehle's query about seed size variation among
Arabidopsis genotypes, I would like to point out a recent paper on
the effects of genotypic differences in seed size on seedling survival:
Krannitz, Aarssen and Dow (1991) The effect of genetically based
differences in seed size on seedling survival in Arabidopsis
thaliana (Brassicaceae). American Journal of Botany 78: 446-450.