Ecophysiology and genetic diversity in species of the bamboo Chusquea in the high Andes, Venezuela
Ecophysiology and genetic diversity in species of the bamboo Chusquea in the high Andes, Venezuela
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DOI：
10.1080/17550874.2019.1673847
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发表时间：
2019-10
影响因子：
1.5
通讯作者：
F. Ely;F. Rada;G. Fermin;L. Clark
中科院分区：
文献类型：
--
作者：
F. Ely;F. Rada;G. Fermin;L. Clark
摘要背景：Chusquea属木本竹生长在委内瑞拉安第斯山脉的各个海拔高度。它们的生长形态和密度沿云雾林- páramo梯度变化。本文利用生态生理性状和种群遗传多样性信息来解释委内瑞拉梅里达安第斯山脉丘斯奎亚生长形态的分布。目的：在考虑开花模式、生长形态和生境差异的情况下，定量分析云林竹和灌木状páramo竹的生理生态响应和遗传多样性差异。方法：对秋葵的生长形态、生境、开花模式和遗传多样性与耐低温性、水分关系和叶片气体交换等变量进行分析。遗传多样性研究基于云林和páramo群体的序列间简单重复序列和随机扩增多态性DNA标记分析。结果：Chusquea的云雾林和灌木状páramo物种在干湿季节对所有变量的生态生理反应非常相似，并且能够通过适度过冷承受冰冻温度。与云雾林- páramo梯度相关的物种保持低气孔导度和蒸腾速率，有利于高叶片水势，而不限制光合速率。生长在连续林线以上的灌木状竹的净光合速率略有下降，这与水分利用效率的提高有关。竹藤和灌木状竹具有相当高的遗传多样性，与非克隆种相当。结论：委内瑞拉安第斯山脉的Chusquea物种是一个生理上相对均匀的群体，跨越了广泛的海拔梯度。种群遗传多样性与开花模式和生境条件的关系大于与生长形态的关系。
ABSTRACT Background: Woody bamboos of the genus Chusquea grow along a broad range of elevations in the Venezuelan Andes. Their growth-form and density vary along the cloud forest – páramo gradient. In this article, we related ecophysiological traits and population genetic diversity information to explain the distribution of growth-form patterns of Chusquea in the Merida Andes, Venezuela. Aims: We quantified differences in the ecophysiological response and genetic diversity of scandent cloud forest and shrub-like páramo bamboos of the genus Chusquea, taking in account the differences in their flowering patterns, growth-form and habitat. Methods: We related low temperature resistance, water relations and leaf gas exchange variables to the growth-form, habitat, flowering patterns and genetic diversity in species of Chusquea. The genetic diversity study was based on Inter Sequence Simple Repeats and Random Amplified Polymorphic DNA markers analysis of cloud forest and páramo populations. Results: Scandent cloud forest and shrub-like páramo species of Chusquea had a very similar ecophysiological response for all the variables analysed during wet and dry seasons and were capable of enduring freezing temperatures through moderate supercooling. Species associated with the cloud forest – páramo gradient maintained low stomatal conductance and transpiration rates that favoured high leaf water potentials, without limiting photosynthetic rates. Shrub-like bamboos growing above the continuous forest line had a small decline in net photosynthesis rates, associated with an increase in water use efficiency. Both scandent and shrub-like bamboos had a remarkably high genetic diversity, comparable to non-clonal species. Conclusions: Species of Chusquea in the Venezuelan Andes are a physiologically relatively homogeneous group across a broad elevation gradient. Population genetic diversity appears to be more related with their flowering pattern and habitat conditions than with their growth form.