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1 February 2002 THE INHERITANCE OF MODIFIERS CONFERRING SELF-FERTILITY IN THE PARTIALLY SELF-INCOMPATIBLE PERENNIAL,CAMPANULA RAPUNCULOIDES L. (CAMPANULACEAE)
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Abstract

The role of partial self-incompatibility in plant breeding system evolution has received little attention. Here, we examine the genetic basis of modifiers conferring self-fertility in the creeping bellflower, Campanula rapunculoides L. (Campanulaceae), a partially self-incompatible herb. A survey of 35 individuals from two natural populations indicates that 45% of them are strongly self-incompatible, 40% intermediately self-incompatible, and 15% weakly self-incompatible and that some plants show a strong breakdown in self-incompatibility over floral age. We generated 101 F1 families by random crossing among 31 parental plants and estimated the heritability of self-fertility in day 1 and day 4 female-phase flowers, the genetic correlation between day 1 and day 4 self-fertility, and the coefficient of additive genetic variance of self-fertility. We use linear regression and data from additional crosses to examine whether there are significant maternal effects in the expression of self-fertility. We use Fain's test to determine if a major gene influences self-fertility and, finding no evidence, use data from additional crosses on an F2 generation to estimate the mean number and dominance of genes conferring self-fertility. These analyses indicate that the heritability (h2) of self-fertility is 0.24 in day 1 female-phase flowers and 0.44 in day 4 flowers, self-fertility is primarily additive but shows some recessive effects, and self-fertility is estimated to be controlled by four genetic factors. In addition, we have evidence that there may be maternal effects for self-fertility, especially for weakly self-incompatible plants. The significance of these results in the context of mating system evolution is discussed.

Corresponding Editor: M. Morgan

Sara V. Good-Avila and Andrew G. Stephenson "THE INHERITANCE OF MODIFIERS CONFERRING SELF-FERTILITY IN THE PARTIALLY SELF-INCOMPATIBLE PERENNIAL,CAMPANULA RAPUNCULOIDES L. (CAMPANULACEAE)," Evolution 56(2), 263-272, (1 February 2002). https://doi.org/10.1554/0014-3820(2002)056[0263:TIOMCS]2.0.CO;2
Received: 22 May 2001; Accepted: 1 October 2001; Published: 1 February 2002
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