Annual-perennial lifespan variation in Chaenactis douglasii suggests a drought escape strategy in warm-arid environments

IF 2.4 2区生物学 Q2 PLANT SCIENCES

American Journal of Botany Pub Date : 2024-08-09 DOI:10.1002/ajb2.16391

Cameron H. Amos, Bryce A. Richardson, Sarah Barga, Francis F. Kilkenny, R. Kasten Dumroese

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引用次数: 0

Abstract

Premise

Intraspecific variation in drought resistance traits, such as drought escape, appear to be frequent within wild, ruderal forb species. Understanding how these traits are arrayed across the landscape, particularly in association with climate, is critical to developing forbs for wildland restoration programs. Use of forbs is requisite for maintaining biological diversity and ecological services.

Methods

Using 6074 greenhouse-grown Chaenactis douglasii seedlings from 95 wild, seed-sourced populations across the western United States, we recorded bolting phenology and estimated genome size using flow cytometry. Mixed-effects regression models were used to assess whether climate of seed origin was predictive for bolting phenology and genome size.

Results

Variation in bolting, reflecting an annual vs. perennial lifespan in this species, was observed in 8.7% of the plants, with bolting plants disproportionately occurring in locations with warm, arid climates. Populations with increasing heat and aridity were positively correlated with observed bolting (r = 0.61, p < 0.0001). About one-third (22%) of the total (61%) lifespan variation was attributed to seed source climate and annual heat moisture index, a measure of aridity. Genome size had no significant effect on bolting. Projected climate modeling for mid-century (2041–2070) supports an increasing occurrence of annual lifespan.

Conclusions

Our analyses support a drought escape, bet-hedging strategy in C. douglasii. Populations exposed to greater aridity exhibited a higher proportion of individuals with an annual lifespan. Drought escape leading to an annual lifespan can affect how seeds are propagated and deployed for climate-informed restoration.

查看原文本刊更多论文

Chaenactis douglasii的一年生-多年生寿命变化表明，在温暖干旱的环境中，它有一种逃避干旱的策略。

前提：抗旱特性（如干旱逃逸）的种内变异似乎在野生草本禁草物种中很常见。了解这些特性如何在整个地形中排列，特别是与气候的关系，对于开发用于荒地恢复计划的草本植物至关重要。使用草本植物是维持生物多样性和生态服务的必要条件：方法：我们使用 6074 株温室栽培的 Chaenactis douglasii 幼苗，这些幼苗来自美国西部 95 个种子来源的野生种群。我们使用混合效应回归模型来评估种子产地的气候是否能预测萌芽期和基因组大小：结果：在8.7%的植株中观察到了栓皮现象的变化，这反映了该物种一年生与多年生的寿命差异，在气候温暖干旱的地区，栓皮植株的比例过高。越来越热和越来越干旱的种群与观察到的栓皮现象呈正相关（r = 0.61，p 结论）：我们的分析支持杜格拉斯草（C. douglasii）的干旱逃逸和对冲策略。暴露在更高干旱度下的种群表现出更高比例的年寿个体。干旱逃逸导致的年寿命会影响种子的繁殖和部署，从而影响气候恢复。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

American Journal of Botany 生物-植物科学

CiteScore

4.90

自引率

6.70%

发文量

171

审稿时长

3 months

期刊介绍： The American Journal of Botany (AJB), the flagship journal of the Botanical Society of America (BSA), publishes peer-reviewed, innovative, significant research of interest to a wide audience of plant scientists in all areas of plant biology (structure, function, development, diversity, genetics, evolution, systematics), all levels of organization (molecular to ecosystem), and all plant groups and allied organisms (cyanobacteria, algae, fungi, and lichens). AJB requires authors to frame their research questions and discuss their results in terms of major questions of plant biology. In general, papers that are too narrowly focused, purely descriptive, natural history, broad surveys, or that contain only preliminary data will not be considered.