Molecular characterization of mahogany (Swietenia macrophylla King, Meliaceae) in the remnant natural forest of Ecuador

Limongi R.; Pico-Mendoza J.; Morillo E.; Pinoargote M.; Buitrón J.; Meneses S.; Navarrete B.; Carrasco B.

Keywords: Mahogany, genetics variability heterozygosity, SSR


The Swietenia macrophylla King (Meliaceae) mahogany tree is widely spread in the neotropics. In Ecuador, it has a wide distribution range from the coastal zone to the Amazon. The mahogany tree is an endangered species due the overexploitation of the high commercial value of its wood. This study is aimed to characterize the Simple Sequence Repeat (SSR) variability of 123 trees selected from six provinces of Ecuador. The results showed that the natural mahogany population had a low level of genetic diversity (A = 6.9; Ho = 0.39; He = 0.43) and a significant heterozygous deficit inbreeding coefficient (F = 0.16). The probability of identity (PI) of the 12 microsatellite markers was low 4.3 × 10−9 and the cumulative exclusion probability of 99.99%. Additionally, the relatedness coefficient among individuals was −0.010 (se = 0.004). The genetic diversity among populations was moderate (ΦST = 8%). In addition, the structure analysis showed two genetic groups; however, it was possible to distinguish admixture within the entire range evaluated. These results show the need to establish strategies that allow the recovery and increase of the genetic diversity in natural populations, especially with the selection of trees to harvest seeds, as well as crossing the tree genetic pool to recombine their diversity.

Más información

Título de la Revista: Neotropical Biodiversity
Volumen: 8
Editorial: Taylor and Francis Ltd.
Fecha de publicación: 2022
Página de inicio: 222
Página final: 228
Idioma: Inglés
Financiamiento/Sponsor: This work was supported by the Estación Experimental Litoral Sur y Estación Experimental Portoviejo INIAP, Proyect: Preservación de especies maderables nativas en peligro de extinción en el ecosistema de bosque seco del Litoral ecuatoriano; Programa de Co
Notas: ISI