Morpho-physiological adaptations to drought stress in nitrogen-fixing and non-nitrogen-fixing plants

IF 2.4 3区环境科学与生态学 Q2 ECOLOGY

Frontiers in Ecology and Evolution Pub Date : 2024-04-26 DOI:10.3389/fevo.2024.1407882

Dongmin Zhao, Maohong Wei, Xiaoting Wang, Muhammad Aqeel, Jinzhi Ran, Jianming Deng

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Abstract

Drought profoundly affects the morpho-physiological responses of desert plants in dryland. To scrutinize the morpho-physiological responses of nitrogen (N)-fixing legumes (Ammopiptanthus mongolicus, Caragana korshinskii), N-fixing non-legumes (Elaeagnus angustifolia, Hippophae rhamnoides), and non-N-fixing plants (Nitraria tangutorum, Haloxylon ammodendron) under varied drought stress levels (75%, 50%, 25% and 5% of soil water holding capacity), a pot experiment was conducted in greenhouse. Following prolonged water deficit, carbon (C) and N stoichiometry, metabolic rates, plant growth, and biomass distribution of unstressed and stressed plants were recorded. Intensified drought significantly reduced stem, root and whole-plant biomass, with no significant changes observed in leaf dry-fresh mass ratio, specific leaf area, intrinsic water use efficiency and root to shoot ratio. However, other traits were impacted differently, reflecting distinct adaptive strategies to drought among three plant functional types (PFTs). Patterns of trait-soil water content (SWC) relationships varied across different PFTs, with N-fixing non-legumes followed by N-fixing legumes displayed greater sensitivity to SWC variations than non-N-fixing plants. This resulted in a shift from a stronger trait-SWC relationship in N-fixing non-legumes and N-fixing legumes to a less correlated relationship in non-N-fixing plants. The diverse responses to drought among PFTs suggest a shift from N limitation to water limitation as SWC decreases.

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固氮和非固氮植物对干旱胁迫的形态生理适应性

干旱严重影响旱地荒漠植物的形态生理反应。为了研究固氮豆科植物（Ammopiptanthus mongolicus、Caragana korshinskii）、非固氮豆科植物（Elaeagnus angustifolia、Hippophae rhamnoides）和非固氮植物（Nitraria tangutorum、Haloxylon ammodendron）在不同干旱胁迫水平（土壤持水量的75%、50%、25%和5%）下的形态生理反应，研究人员在温室中进行了盆栽实验。在长期缺水的情况下，记录了未受胁迫和受胁迫植物的碳（C）和氮的化学计量、新陈代谢率、植物生长和生物量分布。强化干旱明显降低了茎、根和整株植物的生物量，叶片干鲜质量比、比叶面积、内在水分利用效率和根芽比没有观察到明显变化。然而，其他性状受到了不同的影响，反映出三种植物功能类型（PFTs）对干旱有不同的适应策略。不同植物功能类型的性状-土壤含水量（SWC）关系模式各不相同，与非固氮植物相比，固氮非豆科植物对SWC变化的敏感性更高，其次是固氮豆科植物。这导致固氮非豆科植物和固氮豆科植物的性状-SWC 关系从较强转变为非固氮植物的较弱相关关系。PFTs 对干旱的不同反应表明，随着 SWC 的降低，氮限制已转变为水限制。

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

Frontiers in Ecology and Evolution Environmental Science-Ecology

CiteScore

4.00

自引率

6.70%

发文量

1143

审稿时长

12 weeks

期刊介绍： Frontiers in Ecology and Evolution publishes rigorously peer-reviewed research across fundamental and applied sciences, to provide ecological and evolutionary insights into our natural and anthropogenic world, and how it should best be managed. Field Chief Editor Mark A. Elgar at the University of Melbourne is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics and the public worldwide. Eminent biologist and theist Theodosius Dobzhansky’s astute observation that “Nothing in biology makes sense except in the light of evolution” has arguably even broader relevance now than when it was first penned in The American Biology Teacher in 1973. One could similarly argue that not much in evolution makes sense without recourse to ecological concepts: understanding diversity — from microbial adaptations to species assemblages — requires insights from both ecological and evolutionary disciplines. Nowadays, technological developments from other fields allow us to address unprecedented ecological and evolutionary questions of astonishing detail, impressive breadth and compelling inference. The specialty sections of Frontiers in Ecology and Evolution will publish, under a single platform, contemporary, rigorous research, reviews, opinions, and commentaries that cover the spectrum of ecological and evolutionary inquiry, both fundamental and applied. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria. Through this unique, Frontiers platform for open-access publishing and research networking, Frontiers in Ecology and Evolution aims to provide colleagues and the broader community with ecological and evolutionary insights into our natural and anthropogenic world, and how it might best be managed.