一种极度濒危的夏威夷特有灌木幼苗耐旱性和相关性状的种内变异

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2020-03-03 DOI:10.1080/17550874.2020.1730459
A. Westerband, Lalasia Bialic‐Murphy, Lauren A. Weisenberger, K. Barton
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引用次数: 8

摘要

摘要背景:气候变化的速度超过了物种的适应能力,尤其是濒危物种。遗传变异和表型可塑性对种群的持久性很重要,但很少有研究将干旱条件下濒危物种的性状与幼苗性能联系起来。目的:评估干旱条件下的种内变异和性状可塑性,以了解濒危物种如何应对日益严重的干旱。方法:采用温室试验方法,对夏威夷一种极度濒危灌木——卵状灌木(Schiedea obovata)的耐旱性进行了研究。来自5个母系家庭(3个自交和2个种群间杂交)的幼苗接受每日浇水或模拟干旱,我们测量了生长、与耐旱性相关的性状以及在干旱末期死亡的天数。结果:干旱会减少生长,但不会导致死亡。我们检测到生长的遗传变异,但没有发现性状可塑性,除了碳氮,干旱降低。我们没有发现干旱条件下提高生产性能的性状,但发现了四种生理性状,它们在对照和干旱条件下对生长的影响不同。结论:濒危灌木具有中等耐旱性,性状可塑性较低。在气候变化条件下保护濒危物种将受益于对胁迫耐受性的研究,特别是在脆弱的苗期。
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Intraspecific variation in seedling drought tolerance and associated traits in a critically endangered, endemic Hawaiian shrub
ABSTRACT Background: Climates are changing at a rate that exceeds the adaptive capacity of species, especially endangered species. Genetic variation and phenotypic plasticity are important for population persistence, yet few studies have linked traits to seedling performance under drought in endangered species. Aims: We assessed intraspecific variation and trait plasticity under drought, to understand how an endangered species would cope with increasingly severe droughts. Methods: Using greenhouse experiments, we assessed drought tolerance of a critically endangered Hawaiian shrub, Schiedea obovata. Seedlings from five maternal families (three selfed and two interpopulation crosses) were subjected to daily watering or a simulated drought, and we measured growth, traits linked to drought tolerance, and days until death under terminal drought. Results: Drought reduced growth but not days until death. We detected genetic variation in growth, but no trait plasticity except in carbon:nitrogen, which decreased under drought. We did not detect traits that enhanced performance under drought but identified four physiological traits whose effects on growth varied under control and drought. Conclusions: Our results indicate moderate drought tolerance of an endangered shrub, and low trait plasticity. Conservation of endangered species under shifting climates will benefit from studies of stress tolerance, particularly at the vulnerable seedling stage.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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