Long pollen dispersal prevents biparental inbreeding depression in seeds in a natural population of the tropical tree Shorea laxa

FOREST ECOLOGY AND MANAGEMENT

卷:489

Article

Takeuchi, Yayoi¹  Diway, Bibian² 

[1] Natl Inst Environm Studies, Ctr Environm Biol & Ecosyst Studies, 16-2 Onogawa, Tsukuba, Ibaraki 3058506, Japan

[2] Forest Dept Sarawak, Res Dev & Innovat Div, Km 10 Jalan Datuk Amar Kalong Ningkan, Kuching 93250, Malaysia

关键词: Borneo;    Dipterocarps;    Genetic structure;    Microsatellite markers;    Relatedness;    Structural equation modeling (SEM);   

DOI  :  10.1016/j.foreco.2021.119063

来源: Elsevier

【 摘 要 】

The aim of this study was to detect biparental inbreeding depression in seeds in a natural population of the tropical tree Shorea laxa. Using microsatellite markers, we conducted parentage analysis and directly estimated outcrossing rate and contemporary pollen dispersal across a natural population (100 ha). We found a high outcrossing rate and frequent long pollen dispersal in S. laxa, even though the population-level flowering during the study was not intensive. We also found a significant but weak negative correlation between pairwise relatedness and spatial distance between adult trees. Structural equation modeling revealed significant decrease in seed size with increasing pairwise relatedness of seed parents, indicating biparental inbreeding depression and also indicating a positive contribution of maternal internal relatedness and a negative contribution of pollen dispersal distance to the relationships among seed size and pairwise relatedness of seed parents. These results suggest that long-distance pollen dispersal is essential to prevent biparental inbreeding depression in S. laxa. When developing conservation strategies for S. laxa, attention must be paid to the breeding structure and phenology to ensure long-distance pollen dispersal and prevent reproductive isolation and inbreeding.

【 授权许可】

Free