Resurrected seeds from herbarium specimens reveal rapid evolution of drought resistance in a selfing annual
Resurrected seeds from herbarium specimens reveal rapid evolution of drought resistance in a selfing annual
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DOI：
10.1002/ajb2.16265
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发表时间：
2023-12-15
影响因子：
3
通讯作者：
Lowry，David B.
中科院分区：
文献类型：
--
作者：
Christie，Kyle;Pierson，Natalie R.;Lowry，David B.
与气候变化相关的干旱和干旱的增加对植物种群施加了前所未有的选择压力。种群是否能够迅速适应，以及哪些生活史特征可能会增加干旱下的适应性，仍然是悬而未决的问题。方法采用复活生态学方法，利用植物标本馆收集的休眠种子来评估半干旱的科罗拉多高原上的巴塔哥尼加车前草种群是否在该地区近十年的严重干旱中迅速进化。我们量化了与干旱逃避和抗旱性相关的多个性状，并评估了祖先和后代在模拟干旱下的存活率。结果后代种群在资源分配上发生了显著的变化，对生殖组织的投入较少，对地上和地下营养组织的投入相对较多。叶生物量大的植物在终末干旱条件下存活时间长；此外，即使考虑到叶片生物量增加的影响，后代幼苗比它们的祖先在干旱中存活的时间更长。结论研究结果表明，在干旱或半干旱环境中，植物组织分配策略的变化可能是其对干旱适应反应的基础。这项工作还说明了一种新的方法，记录了在特定情况下，植物标本馆标本中的种子可能为未来的复活实验提供未开发的休眠繁殖体来源。
PremiseIncreased aridity and drought associated with climate change are exerting unprecedented selection pressures on plant populations. Whether populations can rapidly adapt, and which life history traits might confer increased fitness under drought, remain outstanding questions.MethodsWe utilized a resurrection ecology approach, leveraging dormant seeds from herbarium collections to assess whether populations ofPlantago patagonicafrom the semi‐arid Colorado Plateau have rapidly evolved in response to approximately ten years of intense drought in the region. We quantified multiple traits associated with drought escape and drought resistance and assessed the survival of ancestors and descendants under simulated drought.ResultsDescendant populations displayed a significant shift in resource allocation, in which they invested less in reproductive tissues and relatively more in both above‐ and below‐ground vegetative tissues. Plants with greater leaf biomass survived longer under terminal drought; moreover, even after accounting for the effect of increased leaf biomass, descendant seedlings survived drought longer than their ancestors.ConclusionsOur results document rapid adaptive evolution in response to climate change in a selfing annual and suggest that shifts in tissue allocation strategies may underlie adaptive responses to drought in arid or semi‐arid environments. This work also illustrates a novel approach, documenting that under specific circumstances, seeds from herbarium specimens may provide an untapped source of dormant propagules for future resurrection experiments.