INHERITANCE OF SELF-COMPATIBILITY IN APRICOT

The study was carried out with 4-year-old apricot progenies from the breeding programmes at the ARS in Fresno, California, and at the CSIC in Murcia, Spain.
Seeldings from 19 different crosses were studied to determine the inheritance of the genetic incompatibility trait.
The 19 crosses included those where both parents were self-compatible, or both self-incompatible, as well as those where a self-compatible parent and a self-incompatible parent were crossed.
Two different methods were used to determine incompatibility.
Some of the seedlings were studied by bagging a sufficiently high number of flowers in balloon stage and determining the percentage of fruit set several weeks later.
The rest of the seedlings were studied by following pollen tube growth in the style, by means of fluorescent microscopy.
Results indicated that a monofactorial system with a multiallelic series controls the trait.
Self-incompatibility alleles stop pollen tube growth if the same allele is present in the pollen grain and in the pistil.
For self-compatible cultivars a self-compatibility allele allows pollen tube growth in any style to reach the ovules.

Eucarpia Symposium on Fruit Breeding and Genetics

L. Burgos, C.A. Ledbetter, F. Ortín-Párraga, O. Pérez-Tornero, J. Egea

Prunus armeniaca, incompatibility, fruit set, breeding, genetics

https://doi.org/10.17660/ActaHortic.1998.484.42