Demographically idiosyncratic responses to climate change and rapid Pleistocene diversification of the walnut genus Juglans (Juglandaceae) revealed by whole-genome sequences
Demographically idiosyncratic responses to climate change and rapid Pleistocene diversification of the walnut genus Juglans (Juglandaceae) revealed by whole-genome sequences
复制标题
全基因组序列揭示核桃属核桃属（胡桃科）对气候变化的人口特征响应和更新世快速多样化
DOI：
10.1111/nph.14917
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发表时间：
2018-03-01
期刊：
影响因子：
9.4
通讯作者：
Zhang, Da-Yong
中科院分区：
文献类型：
--
作者：
Bai, Wei-Ning;Yan, Peng-Cheng;Zhang, Da-Yong
无论是物种的人口和多样化主要是由外在的环境变化，如第四纪的气候振荡或内在的生物相互作用，如拮抗剂之间的共同进化是一个积极的辩论问题。事实上，它们的相对重要性可以通过跟踪过去相当长的时间段内的种群波动来评估。我们对11个温带核桃属物种的基因组应用成对顺序马尔可夫结合方法来估计有效种群大小（Ne）的变化轨迹，并使用基于贝叶斯结合的方法同时考虑多个基因组（G-PHOCS）来估计谱系之间的分歧时间。所有研究物种的e曲线在100万年前收敛，这可能反映了核桃属最后一次拥有共同祖先的时间。这一估计得到了G-PHOCS发散时间估计的证实。但是，所有物种并没有类似的反应，以戏剧性的气候振荡后，早更新世冷却，所以在Ne的变化的时间和幅度不同的物种，甚至同种lineages.The温带核桃物种的人口历史并不是由外在的环境变化单独驱动，和一个关键的作用可能是由物种特异性的因素，如共同进化的相互作用与专门的病原体。
Whether species demography and diversification are driven primarily by extrinsic environmental changes such as climatic oscillations in the Quaternary or by intrinsic biological interactions like coevolution between antagonists is a matter of active debate. In fact, their relative importance can be assessed by tracking past population fluctuations over considerable time periods.We applied the pairwise sequentially Markovian coalescent approach on the genomes of 11 temperate Juglans species to estimate trajectories of changes in effective population size (Ne) and used a Bayesian-coalescent based approach that simultaneously considers multiple genomes (G-PHOCS) to estimate divergence times between lineages.N-e curves of all study species converged 1.0 million yr ago, probably reflecting the time when the walnut genus last shared a common ancestor. This estimate was confirmed by the G-PHOCS estimates of divergence times. But all species did not react similarly to the dramatic climatic oscillations following early Pleistocene cooling, so the timing and amplitude of changes in Ne differed among species and even among conspecific lineages.The population histories of temperate walnut species were not driven by extrinsic environmental changes alone, and a key role was probably played by species-specific factors such as coevolutionary interactions with specialized pathogens.