Unique drought resistance strategies occur among monkeyflower populations spanning an aridity gradient
Unique drought resistance strategies occur among monkeyflower populations spanning an aridity gradient
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跨越干旱梯度的猴花种群中存在独特的抗旱策略
DOI：
10.1002/ajb2.16207
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发表时间：
2023
影响因子：
3
通讯作者：
Kooyers, Nicholas J.
中科院分区：
文献类型：
--
作者：
FitzPatrick, Joshua A.;Doucet, Braden I.;Holt, Stacy D.;Patterson, Courtney M.;Kooyers, Nicholas J.
一年生植物通常表现出逃避干旱和避免干旱的策略，以应对有限的水供应。为了确定种群对更频繁和更严重的干旱的反应，确定分化策略的变异程度和潜在因素是必要的。方法我们利用在操纵干旱和数量遗传学实验中跨干旱梯度收集的5个含羞草种群，研究干旱胁迫下结构性和终末性干旱诱导的反应。结果在与干旱逃逸和干旱回避相关的性状上，种群差异很大。最中等的种群表现出独特的资源节约策略。干旱条件下，旱生植物种群表现出极强的可塑性，包括在较短的高度开花较早，提高水分利用效率，以及改变C：N比。然而，不同群体的可塑性反应也不同，有两个群体生长速度较慢，开花较早，另一个群体的生长速度较快。虽然几乎所有的性状都是可遗传的，但在处理和通常情况下，群体之间的表型相关性有很大不同。结论我们的结果表明，群体的抗旱策略可能很好地适应了当地的水分可获得性模式。大量的塑料反应表明，旱生种群已经可以通过可塑性来适应干旱，但不经常暴露在干旱中的种群可能更脆弱。
PremiseAnnual plants often exhibit drought‐escape and avoidance strategies to cope with limited water availability. Determining the extent of variation and factors underlying the evolution of divergent strategies is necessary for determining population responses to more frequent and severe droughts.MethodsWe leveraged fiveMimulus guttatuspopulations collected across an aridity gradient within manipulative drought and quantitative genetics experiments to examine constitutive and terminal‐drought induced responses in drought resistance traits.ResultsPopulations varied considerably in drought‐escape‐ and drought‐avoidance‐associated traits. The most mesic population demonstrated a unique resource conservative strategy. Xeric populations exhibited extreme plasticity when exposed to terminal drought that included flowering earlier at shorter heights, increasing water‐use efficiency, and shifting C:N ratios. However, plasticity responses also differed between populations, with two populations slowing growth rates and flowering at earlier nodes and another population increasing growth rate. While nearly all traits were heritable, phenotypic correlations differed substantially between treatments and often, populations.ConclusionsOur results suggest drought resistance strategies of populations may be finely adapted to local patterns of water availability. Substantial plastic responses suggest that xeric populations can already acclimate to drought through plasticity, but populations not frequently exposed to drought may be more vulnerable.