Mating system analysis in a natural population ofAcacia niloticasubspeciesleiocarpa

✍ Scribed by A. K. Mandal; R. A. Ennos; C. W. Fagg

• Book ID: 104671225
• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 558 KB
• Volume: 89-89
• Category: Article
• ISSN: 0040-5752
• DOI: 10.1007/bf00224520

✦ Synopsis

The mating-system was investigated in a natural population of the tetraploid taxon Acacia nilotica ssp. leiocarpa using open-pollinated seeds from 15 families. Six-day-old germinated seeds were used for starch-gel electrophoresis. Three enzyme systems (ADH, EST-1, and 6PGD) were scored. Isozyme banding patterns and segregation of isozyme variants within families suggest that the species is an autotetraploid displaying tetrasomic inheritance. Estimates of single-locus (ts=0.358) and multilocus (tm=0.384) population outcrossing rates were homogeneous, and indicate substantial selfing in the population. Heterogeneity of outcrossing estimates among loci and families were marked, suggesting departure from the assumptions of the mixed-mating model. Implications of the result for the utilization of germplasm in tree-improvement programmes are noted.