Genetic diversity variation during the natural regeneration of Vatica guangxiensis, an endangered tree species with extremely small populations

• DOI: 10.1016/j.gecco.2023.e02400
• Publication Date: 2023-02-14T22:08:13Z
• Authors: Xianliang Zhu; Rong Zou; Jianmin Tang; Lili Deng; Xiao Wei
• Keywords: Population bottleneck; Effective population size; Nucleotide diversity

Vatica guangxiensis X. L. Mo (Dipterocaceae) is a valuable timber tree species endemic to China and typical plant with extremely small populations (PSESP). To understand the pattern variations in genetic diversity of V. during natural regeneration, large-scale genome-wide SNPs were developed using genotyping by sequencing (GBS) assess population structure infer demographic history. The observed heterozygosity (HO), expected (HE), nucleotide (π) 0.1810, 0.2128, 0.2178, respectively, demonstrating low characteristic similar most PSESP. However, further analysis trees at different periods regeneration revealed that both medium had lower than big trees. One important cause declining may be inbreeding forced due very size. Notably, rare component was detected genomes several individuals groups, which have been derived from other died. In addition, Tajima'D value (0.0689) Stairway plot bottleneck along continuous decline effective size since last glacial period. These findings expand understanding evolutionary history PSESP variation patterns their diversity, thus providing basis develop an conservation strategy.