不平衡选择压力加速了杨树和柳树的分化

该数据是林木次生生长的分子调控和环境胁迫机制项目论文，数据内容是不平衡选择压力加速了杨树和柳树的分化。杨树和柳树来自于一个共同的四倍体祖先，但哪一种在进化上更原始，但仍存在争议。在这两个物种中，不同的染色体已经重新进化成性染色体，分析柳树和杨树性别测定区域的theωratio和PGRS发现，在染色体水平上，杨树的性染色体在所有染色体成员中基因密度最低，而在柳树中没有观察到这一特征，这表明种群可能从其祖先继承更早的性染色体。本研究结果为更好地理解杨柳遗传机制提供了重要信息。

This dataset is derived from the research paper of the project studying molecular regulation of secondary growth and environmental stress response mechanisms in forest trees. The core content of this dataset demonstrates that divergent selection pressures accelerated the differentiation of Populus and Salix. Populus and Salix share a common tetraploid ancestor, yet which genus is evolutionarily more primitive remains a debated topic. In both species, distinct chromosomes have independently evolved into sex chromosomes. Analysis of the ω ratio and PGRS in the sex-determining regions of Salix and Populus revealed that, at the chromosomal level, the sex chromosomes of Populus have the lowest gene density among all its chromosomes, whereas this feature was not observed in Salix, suggesting that the two lineages may have inherited earlier sex chromosomes from their common ancestor. The findings of this study provide critical insights for advancing our understanding of the genetic mechanisms underlying the evolution of Populus and Salix.