Linkage relationships of loci controlling protein amounts in maritime pine (Pinus pinaster Ait.)

Abstract

The comparison of two-dimensional protein patterns of 56 haploid megagametophytes from a single maritime pine tree allowed the analysis of genetic determinism of qualitative and quantitative variation. One hundred and nineteen loci were localized in 12 linkage groups while two other loci were unlinked. Among the 81 qualitative variants, 58 could be interpreted as allelic products of structural genes. Their distribution in the linkage groups appeared to be non-random, since most of them clustered at a common point in two groups. The remaining 23 qualitative and 40 quantitative variants could best be explained by assuming monogenic determinism of protein amounts. Pleiotropic effects could be responsible for some of the variations in amounts of proteins which cosegregate. © The Genetical Society of Great Britain.