Heat shock and plant leachates regulate seed germination of the endangered carnivorous plant Drosophyllum lusitanicum

IF 2.3 3区 环境科学与生态学 Q2 ECOLOGY
Web Ecology Pub Date : 2018-01-29 DOI:10.5194/WE-18-7-2018
S. Gómez‐González, Maria Paniw, Kamila Antunes, F. Ojeda
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引用次数: 10

Abstract

Abstract. In fire-prone ecosystems, many plant species have specialized mechanisms of seed dormancy that ensure a successful recruitment after fire. A well-documented mechanism is the germination stimulated by fire-related cues, such as heat shock and smoke. However, less is known about the role of inhibitory germination signals (e.g. allelopathy) in regulating post-fire recruitment. Plant leachates derived from the unburned vegetation can enforce dormancy by means of allelopathic compounds, acting as a signal of unfavourable (highly competitive) niche for germination in pyrophyte species. Here, we assessed the separate effects of heat shock and plant leachates on seed germination of Drosophyllum lusitanicum, an endangered carnivorous plant endemic to Mediterranean fire-prone heathlands. We performed a germination experiment in which seeds were subjected to three treatments: (1) 5  min at 100  ∘ C, (2) watering with plant leachate, and (3) control. Germination rate and seed viability was determined after 63 days. Heat shock stimulated seed germination in D. lusitanicum while plant leachates had inhibitory germination effects without reducing seed viability. Thus, both positive and negative signals could be involved in its successful post-fire recruitment. Fire would break seed dormancy and stimulate seed germination of D. lusitanicum through high temperatures, but also by eliminating allelochemical compounds from the soil. These results help to understand the population dynamics patterns found for D. lusitanicum in natural populations, and highlight the role of fire in the ecology and conservation of this endangered species. Seed dormancy imposed by plant-derived leachates as an adaptive mechanism should be considered more in fire ecology theory.
热休克和植物渗滤液调节濒临灭绝的肉食性植物飞虱的种子萌发
摘要在易发生火灾的生态系统中,许多植物物种都有专门的种子休眠机制,以确保在火灾后成功恢复。一个有充分证据的机制是由与火有关的线索刺激发芽,如热休克和烟雾。然而,对抑制发芽信号(如化感作用)在调节火后招募中的作用知之甚少。来自未燃烧植被的植物渗滤液可以通过化感化合物强制休眠,这是叶生植物种萌发不利(高度竞争)生态位的信号。在这里,我们分别评估了热休克和植物渗滤液对地中海易火荒原上濒临灭绝的肉食性植物drosophyllum lusitanicum种子萌发的影响。我们进行了发芽实验,将种子置于三种处理下:(1)在100°C下5分钟,(2)用植物渗滤液浇灌,(3)对照。63 d后测定发芽率和种子活力。热休克对芦笋种子萌发有促进作用,而植物渗滤液对芦笋种子萌发有抑制作用,但不降低种子活力。因此,积极和消极的信号都可能涉及到其成功的火灾后招募。火可以打破种子休眠,刺激种子萌发。路西坦通过高温,也通过消除土壤中的化感化合物。这些结果有助于理解福特发现的种群动态模式。并着重介绍了火灾在这一濒危物种的生态学和保护中的作用。植物源渗滤液的种子休眠作为一种适应性机制,在火灾生态学理论中应予以更多的考虑。
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来源期刊
Web Ecology
Web Ecology Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
4.60
自引率
0.00%
发文量
6
审稿时长
17 weeks
期刊介绍: Web Ecology (WE) is an open-access journal issued by the European Ecological Federation (EEF) representing the ecological societies within Europe and associated members. Its special value is to serve as a publication forum for national ecological societies that do not maintain their own society journal. Web Ecology publishes papers from all fields of ecology without any geographic restriction. It is a forum to communicate results of experimental, theoretical, and descriptive studies of general interest to an international audience. Original contributions, short communications, and reviews on ecological research on all kinds of organisms and ecosystems are welcome as well as papers that express emerging ideas and concepts with a sound scientific background.
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