Mating system and effective population size of the overexploited Neotropical tree (Myroxylon peruiferum L.f.) and their impact on seedling production

The reproductive system of a tree species has substantial impact on genetic diversity and structure within and among natural populations. Such information, should be considered when planning tree planting for forest restoration. Here, we describe the mating system and genetic diversity of an overexploited Neotropical tree, Myroxylon peruiferum L.f. (Fabaceae) sampled from a forest remnant (10 seed trees and 200 seeds) and assess whether the effective population size of nursery-grown seedlings (148 seedlings) is sufficient to prevent inbreeding depression in reintroduced populations. Genetic analyses were performed based on eight microsatellite loci. M. peruiferum presented a mixed mating system with evidence of biparental inbreeding ( tm-ts = 0.118). We found low levels of genetic diversity for M. peruiferum species (allelic richness: 1.40 to 4.82; expected heterozygosity: 0.29 to 0.52). Based on Ne(v) within progeny, we suggest a sample size of 47 seed trees to achieve an effective p...

树种的繁殖系统对自然种群内部及种群间的遗传多样性与遗传结构具有显著影响。在规划森林修复植树方案时，应充分考量此类信息。本研究以采自某森林残遗斑块的过度开发新热带树种香脂木豆（Myroxylon peruiferum L.f.，豆科Fabaceae）为研究对象，描述其交配系统与遗传多样性——本次采样包含10株母树与200粒种子，并评估了苗圃培育的148株实生苗的有效种群大小（effective population size）是否足以防止再引入种群发生近交衰退（inbreeding depression）。本研究基于8个微卫星位点（microsatellite loci）开展遗传分析。香脂木豆呈现混合交配系统，且存在双亲近交的证据（tm-ts = 0.118）。研究发现该树种的遗传多样性水平较低：等位基因丰富度介于1.40至4.82之间，期望杂合度介于0.29至0.52之间。基于子代的有效种群大小Ne(v)，本研究建议需采集47株母树以实现有效的...