Seed functional ecology in Brazilian rock outcrop vegetation: an integrative synthesis.

IF 3.6 2区 生物学 Q1 PLANT SCIENCES Annals of botany Pub Date : 2024-09-09 DOI:10.1093/aob/mcae160
Carlos A Ordóñez-Parra, Natália F Medeiros, Roberta L C Dayrell, Soizig Le Stradic, Daniel Negreiros, Tatiana Cornelissen, Fernando A O Silveira
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Abstract

Background and aims: Rock outcrop vegetation is distributed worldwide and hosts a diverse and unique flora that evolved under harsh environmental conditions. Unfortunately, seed ecology in such ecosystems has received little attention, especially regarding seed traits, germination responses to abiotic factors and the potential role of phylogenetic relatedness on such features Here, we provide the first quantitative and phylogenetically-informed synthesis of the seed functional ecology of Brazilian rock outcrop vegetation, with a particular focus on quartzitic and ironstone campo rupestre.

Methods: Using a database of functional trait data, we calculated the phylogenetic signal of seven seed traits for 371 taxa and tested whether they varied among growth forms, geographic distribution, and microhabitats. We also conducted meta-analyses that included 4,252 germination records for 102 taxa to assess the effects of light, temperature, and fire-related cues on the germination of campo rupestre species and explored how the aforementioned ecological groups and seed traits modulate germination responses.

Key results: All traits and germination responses showed a moderate-to-strong phylogenetic signal. Campo rupestre species responded positively to light and had maximum germination between 20-25 ºC. The effect of temperatures beyond this range was moderated by growth form, species geographic distribution, and microhabitat. Seeds exposed to heat shocks above 80 °C lost viability, but smoke accelerated germination. We found a moderating effect of seed mass for in responses to light and heat shocks, with larger, dormant seeds tolerating heat better but less sensitive to light. Species from xeric habitats evolved phenological strategies to synchronise germination during periods of increased soil water availability.

Conclusions: Phylogenetic relatedness plays a major role in shaping seed ecology of Brazilian rock outcrop vegetation. Nevertheless, seed traits and germination responses varied significantly between growth forms, species geographic distribution and microhabitats, providing support to the regeneration niche hypothesis and the role of functional traits in shaping germination in these ecosystems.

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巴西岩石露头植被的种子功能生态学:综合综述。
背景和目的:岩石露头植被分布于世界各地,拥有在严酷环境条件下进化出的多样而独特的植物区系。遗憾的是,这类生态系统中的种子生态学很少受到关注,尤其是在种子性状、萌发对非生物性因素的反应以及系统发育相关性对这些特征的潜在作用等方面。在此,我们首次对巴西岩石露头植被的种子功能生态学进行了定量和系统发育信息综合分析,并特别关注石英岩和铁岩露头植被:方法:我们利用功能性状数据数据库,计算了 371 个类群的七种种子性状的系统发育信号,并测试了这些性状在生长形式、地理分布和微生境之间是否存在差异。我们还对102个类群的4252条萌发记录进行了荟萃分析,以评估光照、温度和与火有关的线索对莰烯物种萌发的影响,并探讨上述生态类群和种子性状如何调节萌发反应:主要结果:所有性状和萌发反应都显示出中等至强烈的系统发育信号。Campo rupestre物种对光照有积极反应,在20-25 ºC之间萌发率最高。温度超过这一范围时,生长形式、物种地理分布和微生境对其影响有所缓和。种子暴露在 80 °C 以上的热冲击下会失去活力,但烟雾会加速发芽。我们发现种子质量对光和热冲击的反应有调节作用,较大的休眠种子对热的耐受性较好,但对光的敏感性较低。干旱栖息地的物种进化出了物候学策略,以便在土壤水分供应增加的时期同步萌发:结论:系统发育的亲缘关系在巴西岩石露头植被种子生态学的形成过程中发挥了重要作用。然而,不同生长形式、物种地理分布和微生境之间的种子特征和萌发反应差异很大,这为再生生态位假说和功能特征在这些生态系统中影响萌发的作用提供了支持。
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
Annals of botany
Annals of botany 生物-植物科学
CiteScore
7.90
自引率
4.80%
发文量
138
审稿时长
3 months
期刊介绍: Annals of Botany is an international plant science journal publishing novel and rigorous research in all areas of plant science. It is published monthly in both electronic and printed forms with at least two extra issues each year that focus on a particular theme in plant biology. The Journal is managed by the Annals of Botany Company, a not-for-profit educational charity established to promote plant science worldwide. The Journal publishes original research papers, invited and submitted review articles, ''Research in Context'' expanding on original work, ''Botanical Briefings'' as short overviews of important topics, and ''Viewpoints'' giving opinions. All papers in each issue are summarized briefly in Content Snapshots , there are topical news items in the Plant Cuttings section and Book Reviews . A rigorous review process ensures that readers are exposed to genuine and novel advances across a wide spectrum of botanical knowledge. All papers aim to advance knowledge and make a difference to our understanding of plant science.
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