卡廷加地区外来入侵物种 Leucaena leucocephala (Lam.) de Wit(豆科)的种子水合记忆

IF 2.6 3区 环境科学与生态学 Q2 ECOLOGY Journal of Arid Environments Pub Date : 2024-08-12 DOI:10.1016/j.jaridenv.2024.105238
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引用次数: 0

摘要

种子水合记忆是半干旱环境中植物的一种适应策略,这种环境中的水供应不规则且不可预测。在这些环境中原生的物种如果具有记忆,就能在发芽过程中受益于不连续的水合作用,并获得对环境压力的耐受力。本研究的指导性问题是:"入侵半干旱生态系统的外来物种是否也具有种子水合记忆并从非连续水合中获益?为了回答这个问题,我们收集了入侵巴西热带干旱森林的外来物种 Leucaena leucocephala (Lam.) de Wit 的种子。我们以三个不同的时间间隔对种子进行了 0、1、2 和 3 次水合/脱水循环(HD 循环),随后又对种子进行了水、盐和热应力试验。此外,我们还通过建模确定了白花蛇舌草发生的渗透和热极限,并评估了这些极限在种子不连续水合后是否会增加。高密度水合循环对所有受评估胁迫的种子的萌发都有积极影响,提高了种子对水、盐和热胁迫的耐受性。不连续水合增加了耐盐碱和耐热的渗透极限,但没有增加耐缺水的渗透极限。我们的研究结果表明,高密度水分循环也会改变入侵物种对入侵生态系统环境压力的萌发反应模式。
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Seed hydration memory in the invasive alien species Leucaena leucocephala (Lam.) de Wit (Fabaceae) in the Caatinga

Seed hydration memory is an adaptive strategy for plants in semiarid environments where water availability is irregular and unpredictable. Species native to these environments that have memory benefit from discontinuous hydration during their germination process and acquire tolerance to environmental stresses. The guiding question of this study is "does an alien species that invades a semiarid ecosystem also have seed hydration memory and benefit from discontinuous hydration?" To answer this question, we collected seeds of Leucaena leucocephala (Lam.) de Wit, an alien species that invades a Brazilian Tropical Dry Forest. We subjected the seeds to 0, 1, 2 and 3 hydration/dehydration cycles (HD cycles) at three different time intervals and, subsequently, to water, saline and thermal stresses. In addition, we used modeling to define the osmotic and thermal limits for occurrence of L. leucocephala and evaluated whether these limits increase after discontinuous hydration of seeds. The cycles of HD positively influenced the germination of seeds submitted to all stresses evaluated, increasing seed tolerance to treatments of water, saline, and thermal stresses. Discontinuous hydration increased the osmotic limits of salinity and thermal tolerance, although not increasing the osmotic limit of water deficit. Our results show that HD cycles also change the patterns of germinative responses of an invasive species to the environmental stresses of the invaded ecosystem.

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来源期刊
Journal of Arid Environments
Journal of Arid Environments 环境科学-环境科学
CiteScore
5.70
自引率
3.70%
发文量
144
审稿时长
55 days
期刊介绍: The Journal of Arid Environments is an international journal publishing original scientific and technical research articles on physical, biological and cultural aspects of arid, semi-arid, and desert environments. As a forum of multi-disciplinary and interdisciplinary dialogue it addresses research on all aspects of arid environments and their past, present and future use.
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