Wu Zhigang, Wang Zhong, Xie Dong, Wang Huijun, Zhao Aiwen, Wang Yalin, Wang Hanling, Xu Xinwei, Li Tao, Zhao Jindong
The State Key Laboratory of Freshwater Ecology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.
Department of Ecology, College of Life Sciences, Wuhan University, Wuhan, China.
Front Plant Sci. 2022 Oct 20;13:1040282. doi: 10.3389/fpls.2022.1040282. eCollection 2022.
Clonal reproduction is one of the most distinctive characteristics of plants and is common and diverse in aquatic macrophytes. The balance between sexual and asexual reproduction is affected by various conditions, especially adverse environments. However, we know little about clonal diversity of aquatic plants under suboptimal conditions, such as at high altitudes, and having this information would help us understand how environmental gradients influence patterns of clonal and genetic variation in freshwater species. The microsatellite data of four aquatic taxa in our previous studies were revisited to estimate clonal and genetic diversity on the Qinghai-Tibetan Plateau. Clonal diversity among different genetic groups was compared. Local environmental features were surveyed. Beta regressions were used to identify the environmental factors that significantly explained clonal diversity for relative taxon. The level of clonal diversity from high to low was > > species > section species. A positive correlation between clonal and genetic diversity was identified for all taxa, except . Clonal diversity was affected by climate in and by the local environment in . For spp., low elevation and high sediment nutrition were significant for sexual recruitment. The environmental effects on clonal diversity were not significant in sect. spp. Clonal diversity of aquatic plants is moderate to high and varies greatly in highlands. The effects of breeding systems and environmental factors on the patterns of clonal variation were identified. Elevational gradients, climates and local conditions play different roles in clonal diversity among relative taxon. Our results highlight the importance of sexual recruitment in alpine aquatic plant populations and the influence of environmental factors on the genetic patterns in freshwater species at local and regional scales.
克隆繁殖是植物最显著的特征之一，在水生大型植物中很常见且具有多样性。有性繁殖和无性繁殖之间的平衡受多种条件影响，尤其是不利环境。然而，我们对次优条件下（如高海拔地区）水生植物的克隆多样性了解甚少，掌握这些信息将有助于我们理解环境梯度如何影响淡水物种的克隆和遗传变异模式。我们重新审视了之前研究中四个水生类群的微卫星数据，以估算青藏高原上的克隆和遗传多样性。比较了不同遗传群体间的克隆多样性。对当地环境特征进行了调查。使用贝塔回归来确定能显著解释相对类群克隆多样性的环境因素。克隆多样性从高到低的水平为>>物种>组>物种。除了 之外，所有类群的克隆多样性与遗传多样性之间均呈正相关。 的克隆多样性受气候影响，而 的受当地环境影响。对于 属植物，低海拔和高沉积物养分对有性繁殖很重要。在 组 属植物中，环境对克隆多样性的影响不显著。水生植物的克隆多样性为中等至高，在高海拔地区差异很大。确定了繁殖系统和环境因素对克隆变异模式的影响。海拔梯度、气候和当地条件在相对类群的克隆多样性中发挥着不同作用。我们的结果凸显了有性繁殖在高山水生植物种群中的重要性，以及环境因素在局部和区域尺度上对淡水物种遗传模式的影响。
