Mating system in Pterocarpus macrocarpus Kurz in Thailand

• Published in: The Journal of heredity Vol. 89; no. 3; pp. 216 - 221
• Main Authors: Liengsiri, C, Boyle, TJB, Yeh, FC
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01-05-1998; Oxford Publishing Limited (England)
• Subjects: Flowers & plants; Genetics; Geography; Plant reproduction; Trees; Thailand
• ISSN: 0022-1503; 1465-7333
• DOI: 10.1093/jhered/89.3.216

The mating system in 11 natural populations of Pterocarpus macrocarpus in Kurz in Thailand was investigated based on the mixed mating model using 16 isozyme markers. Single-locus outcrossing rates (ta) averaged from 0.620 to 0.931 among populations while multilocus outcrossing rates (tm ranged from 0.719 to 0.959. Both ta and tm revealed a geographic pattern with western populations exhibiting higher outcrossing than eastern populations. Low estimates of outcrossing rates in eastern populations could be attributed to habitat characteristics, degree of disturbance, density, and distribution of flowering mature trees. Individual tree outcrossing rates (tml) indicated that reduced population density associated with disturbance could result in low tm in some eastern populations.