Melton Anthony E, Moran Kara, Martinez Peggy, Ellestad Paige, Milliken Erin, Morales Walker, Child Andrew W, Richardson Bryce A, Serpe Marcelo, Novak Stephen J, Buerki Sven
Department of Biological Sciences Boise State University Boise Idaho USA.
Research Computing and Data Services University of Idaho Moscow Idaho USA.
Plant Environ Interact. 2023 Jul 24;4(4):201-214. doi: 10.1002/pei3.10119. eCollection 2023 Aug.
Western North America has been experiencing persistent drought exacerbated by climate change for over two decades. This extreme climate event is a clear threat to native plant communities. is a keystone shrub species in western North America and is threatened by climate change, urbanization, and wildfire. A drought Genotype × Environment (G × E) experiment was conducted to assess phenotypic plasticity and differential gene expression in . The G × E experiment was performed on diploid seedlings from two populations (one from Idaho, USA and one from Utah, USA), which experience differing levels of drought stress during the summer months. Photosynthetic data, leaf temperature, and gene expression levels were compared between treatments and populations. The Utah population maintained higher photosynthetic rates and photosynthetic efficiency than the Idaho population under drought stress. The Utah population also exhibited far greater transcriptional plasticity than the Idaho population and expressed genes of response pathways distinct from those of the Idaho population. Populations of differ greatly in their drought response pathways, likely due to differences in response pathways that have evolved under distinct climatic regimes. Epigenetic processes likely contribute to the observed differences between the populations.
北美西部二十多年来一直遭受着因气候变化而加剧的持续干旱。这种极端气候事件对当地植物群落构成了明显威胁。[此处原文缺失植物名称]是北美西部的一种关键灌木物种，受到气候变化、城市化和野火的威胁。开展了一项干旱条件下基因型×环境（G×E）实验，以评估[此处原文缺失植物名称]的表型可塑性和基因表达差异。该G×E实验是在来自两个种群（一个来自美国爱达荷州，另一个来自美国犹他州）的二倍体[此处原文缺失植物名称]幼苗上进行的，这两个种群在夏季经历不同程度的干旱胁迫。对处理组和种群之间的光合数据、叶片温度和基因表达水平进行了比较。在干旱胁迫下，犹他种群比爱达荷种群保持了更高的光合速率和光合效率。犹他种群还表现出比爱达荷种群大得多的转录可塑性，并且表达了与爱达荷种群不同的响应途径的基因。[此处原文缺失植物名称]的种群在干旱响应途径上差异很大，这可能是由于在不同气候条件下进化出的响应途径不同所致。表观遗传过程可能导致了观察到的种群间差异。
