Zhang Yajing, Sun Yangyang, Zhong Minchen, Chen Fenglin, Wang Yaning, Tigabu Mulualem, Ma XiangQing, Li Ming
College of Forestry Fujian Agriculture and Forestry University Fuzhou China.
Chinese Fir Germplasm Innovation Engineering Research Center of Fujian Province Fuzhou China.
Ecol Evol. 2025 Apr 11;15(4):e71270. doi: 10.1002/ece3.71270. eCollection 2025 Apr.
Climate change and strait isolation during the glacial period had a profound effect on the differentiation of gymnosperms on both sides of the Taiwan Strait. The taxonomic status and population structure of (Taiwan) and (mainland China) remain contentious due to conflicting morphological and molecular evidence. Thus, we sampled 92 accessions from seven natural populations, six from mainland China and one from Taiwan, and conducted high-throughput genotyping-by-sequencing (GBS) analysis. The northern marginal population exhibited the lowest genetic diversity ( = 4.828 × 10), while the Taiwan population had the highest ( = 5.821 × 10), reflecting its role as a glacial refugium, while mainland populations retained lower diversity due to post-glacial bottlenecks. There was little difference in Tajima's D values of selection pressure between mainland China and Taiwan. However, significant gene flow ( = 2.839) was observed, combined with low values (0.072-0.122), which indicate low genetic differentiation among and . Migration analysis indicated a high probability of unidirectional gene flow from mainland China to Taiwan, with the Dongshan Land Bridge facilitating pre-glacial gene flow. We conclude that represents an ecotype of , shaped by environmental plasticity and incomplete isolation. This study enhances our understanding of the gene flow and evolutionary processes shaping the species and offers new insights into their taxonomic classification.
气候变化和冰川期的海峡隔离对台湾海峡两岸裸子植物的分化产生了深远影响。由于形态学和分子证据相互矛盾，（台湾的）[具体物种名1]和（中国大陆的）[具体物种名2]的分类地位和种群结构仍存在争议。因此，我们从七个自然种群中采集了92份样本，其中六个来自中国大陆，一个来自台湾，并进行了高通量测序基因分型（GBS）分析。北方边缘种群的遗传多样性最低（ = 4.828 × 10），而台湾种群的遗传多样性最高（ = 5.821 × 10），这反映了其作为冰川避难所的作用，而大陆种群由于冰后期瓶颈而保留了较低的多样性。中国大陆和台湾之间在选择压力的Tajima's D值上差异不大。然而，观察到显著的基因流（ = 2.839），同时伴随着较低的[具体指标值]值（0.072 - 0.122），这表明[具体物种名1]和[具体物种名2]之间的遗传分化较低。迁移分析表明，存在从中国大陆到台湾的单向基因流的高可能性，东山陆桥促进了冰期前的基因流。我们得出结论，[具体物种名1]代表了[具体物种名2]的一种生态型，由环境可塑性和不完全隔离塑造而成。本研究增进了我们对塑造该物种的基因流和进化过程的理解，并为其分类学分类提供了新的见解。
