Harnessing landscape genomics to identify future climate resilient genotypes in a desert annual
Harnessing landscape genomics to identify future climate resilient genotypes in a desert annual
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利用景观基因组学来识别沙漠一年生中未来的气候适应基因型
作者：
Daniel F. Shryock;L. K. Washburn;L. DeFalco;T. Esque
当地适应在塑造物种对不断变化的环境的反应方面起着至关重要的作用，使恢复退化地区植被的努力复杂化。快速的气候变化带来了额外的挑战，甚至可能会降低当地来源的种子在恢复过程中的适合性。采用对未来气候具有有利适应能力的种子的预测性恢复战略可能会促进长期的复原力。景观基因组学越来越多地被用来评估局部适应的空间格局，并可能代表一种识别未来适应的基因类型的经济有效的方法。为了证明这种方法，我们从一年生车前的莫哈韦沙漠种群中对760株植物进行了基因分型。对5960个SNPs的基因组扫描发现了184个与气候和卫星植被指标相关的潜在适应性基因座。因果模型表明，潜在适应基因座的变异不会被距离隔离或栖息地阻力隔离所混淆。广义相异度模型(GDM)将潜在适应区域的空间周转归因于温度、降水和NDVI幅度，NDVI幅度是衡量植被返青潜力的一种指标。通过整合物种分布模型(SDM)，我们发现证据表明，夏季最高温度可能既限制了卵形原虫的活动范围，又推动了暴露在较高温度下的种群的适应性分化。在该物种目前的范围内，预计到本世纪中叶，温暖适应型的气候生态位将扩大五倍，并可能具有应对未来气候的关键适应能力。我们建议八个种子转移区，并将每个区规划到其在未来气候中的相对位置。通过扩大未来栖息地的未来栖息地，优先考虑不同类型的种子收集工作，这对恢复从业者来说是一种很有希望的战略，以应对快速变化的气候。
Local adaptation features critically in shaping species responses to changing environments, complicating efforts to revegetate degraded areas. Rapid climate change poses an additional challenge that could reduce fitness of even locally sourced seeds in restoration. Predictive restoration strategies that apply seeds with favourable adaptations to future climate may promote long‐term resilience. Landscape genomics is increasingly used to assess spatial patterns in local adaption and may represent a cost‐efficient approach for identifying future‐adapted genotypes. To demonstrate such an approach, we genotyped 760 plants from 64 Mojave Desert populations of the desert annual Plantago ovata. Genome scans on 5,960 SNPs identified 184 potentially adaptive loci related to climate and satellite vegetation metrics. Causal modelling indicated that variation in potentially adaptive loci was not confounded by isolation by distance or isolation by habitat resistance. A generalized dissimilarity model (GDM) attributed spatial turnover in potentially adaptive loci to temperature, precipitation and NDVI amplitude, a measure of vegetation green‐up potential. By integrating a species distribution model (SDM), we find evidence that summer maximum temperature may both constrain the range of P. ovata and drive adaptive divergence in populations exposed to higher temperatures. Within the species’ current range, warm‐adapted genotypes are predicted to experience a fivefold expansion in climate niche by midcentury and could harbour key adaptations to cope with future climate. We recommend eight seed transfer zones and project each zone into its relative position in future climate. Prioritizing seed collection efforts on genotypes with expanding future habitat represents a promising strategy for restoration practitioners to address rapidly changing climates.
DOI：
10.1073/pnas.0505734102
发表时间：
2005-10-18
影响因子：
11.1
作者：
Breshears, DD;Cobb, NS;Meyer, CW
通讯作者：
Meyer, CW