植物学报2025，Vol.60Issue(3)：407-424,18.DOI:10.11983/CBB24094
短穗竹居群遗传结构及气候适应性分析
Population Genetic Structure and Climate Adaptation Analysis of Brachystachyum densiflorum
摘要
Abstract
INTRODUCTION:Genetic diversity is considered as a crucial aspect in assessment and conservation of rare and en-dangered species.Brachystachyum densiflorum is a species endemic to eastern China.In recent years,with rapid eco-nomic development,accelerated urbanization,and escalating pollutant emissions,the habitat of B.densiflorum has been continuously degraded,habitat fragmentation has intensified,and its populations have shown a tendency to decline. RATIONALE:Genetic diversity endows species with abundant genetic resources and plays a pivotal role in shaping their capacity to adapt to new environments.To elucidate the genetic diversity of B.densiflorum and evaluate the influence of climate change on its genetic variation,reduced-representation genome sequencing technology was employed to obtain single nucleotide polymorphisms(SNPs),and subsequently population genetics and landscape genetics together with species distribution modelling were analyzed. RESULTS:B.densiflorum had a moderate level of genetic diversity.Six populations were divided into two groups,and there was moderate differentiation(FST=0.102)and high gene flow(Nm=2.442)between them.Genotype-environment association analysis indicated that the two groups were diverged attributable to local adaptation to the climate.Tempera-ture differences and low-temperature regimes interacting together with precipitation gave rise to genetic variation of this species.In total,544 adaptive loci were identified,which displayed significant correlations with temperature difference,low-temperature factors(Bio2,Bio6,Bio11,and Bio7),and precipitation factors(Bio19).B.densiflorum migrated evidently northward from the Last Glacial Maximum to the current,with its distribution area increased by 89.5％.However,during the period from 2061 to 2080,the extent of the suitable area for this species will be contracted,and there will be partial degradation and fragmentation occurring in highly suitable areas within Anhui Province. CONCLUSION:B.densiflorum showed a moderate level of genetic diversity and a moderate degree of genetic differen-tiation.Local adaptation drove the formation of the current genetic pattern of B.densiflorum,and temperature differences,low-temperature,and precipitation led to genetic variation.B.densiflorum has evidently migrated northward from the Last Glacial Maximum to the current with increase of distribution area.However,niche modelling indicated that during the period from 2061 to 2080,the suitable habitat area of B.densiflorum would be contracted,with partial degradation and fragmentation occurring in highly suitable areas within Anhui Province.These results provide the basis for conservation and utilization of B.densiflorum.关键词
短穗竹/简化基因组测序/遗传多样性/遗传结构/物种分布模型Key words
Brachystachyum densiflorum/reduced-representation genome sequencing/genetic diversity/genetic struc-ture/species distribution model引用本文复制引用
张如礼,李德铢,张玉霄..短穗竹居群遗传结构及气候适应性分析[J].植物学报,2025,60(3):407-424,18.基金项目
国家自然科学基金(No.31100148)和云南省高层次人才培养计划青年拔尖人才专项(No.YNWR-QNBJ-2019-148) （No.31100148）
