Response of endophyte-infected and endophyte-free tall fescue plants to partial submergence at two developmental stages

IF 1.6 4区 环境科学与生态学 Q3 ECOLOGY
Austral Ecology Pub Date : 2024-05-21 DOI:10.1111/aec.13545
Lucas R. Petigrosso, Osvaldo R. Vignolio, Pedro E. Gundel, María G. Monterubbianesi, Silvia G. Assuero
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Abstract

Tall fescue (Festuca arundinacea Schreb.) is a perennial C3 grass species usually associated with the endophyte fungus Epichloë coenophiala that enhances tolerance to biotic and abiotic stresses. Given that the proportion of infected tall fescue plants in the grasslands of the Flooding Pampa (Argentina) has been progressively increasing, it is proposed that endophytes confer tolerance to the stresses characteristic of that environment, especially flooding. Plants from a naturalized population and a commercial cultivar were grown, both with and without endophyte (wild type and AR584 respectively). The plants were subjected to two submergence treatments (i.e., control and partial submergence) in two development stages (5-leaf stage and beginning of the elongation of internodes). Plant performance (aerial and root biomass, root aerenchyma formation, total root length and root diameter, proportion of reproductive tillers, number of panicles and seeds produced) and endophyte transmission to progeny were evaluated. Endophytes did not alter the ecological fitness of plants under partial submergence. Independently of the water condition, the symbiosis was linked to low biomass in plants from the naturalized population, while the opposite occurred in plants from the cultivar. Partial submergence did not affect the germination of the seeds produced, nor the transmission of the endophyte to the seedlings that originated from them. Our work suggests that the invasion ability of tall fescue in the Flooding Pampa grasslands is not related to an endophyte-mediated improvement of plants to tolerate water excess.

Abstract Image

受内生菌感染和无内生菌的高羊茅植物在两个发育阶段对部分浸没的反应
高羊茅(Festuca arundinacea Schreb.)是一种多年生 C3 禾本科植物,通常与内生真菌 Epichloë coenophiala 有关,这种真菌能增强对生物和非生物压力的耐受性。鉴于受感染的高羊茅植物在泛滥潘帕(阿根廷)草原上所占的比例逐渐增加,有人提出,内生真菌赋予了高羊茅对该环境所特有的压力(尤其是洪水)的耐受性。我们种植了一个归化种群和一个商业栽培品种的植物,其中既有野生型也有不含内生菌的植物(分别为野生型和 AR584)。植物在两个生长阶段(5叶期和节间开始伸长期)接受了两种浸没处理(即对照和部分浸没)。对植物的表现(气生和根的生物量、根的气生组织形成、根的总长度和直径、生殖分蘖的比例、圆锥花序的数量和种子的产量)以及内生菌对后代的传播进行了评估。内生菌并没有改变植物在部分淹没条件下的生态适应性。与水条件无关的是,在归化种群的植物中,共生与低生物量有关,而在栽培种群的植物中则相反。部分浸没既不影响种子的发芽,也不影响内生菌对幼苗的传播。我们的研究结果表明,高羊茅在洪水泛滥的潘帕草原上的入侵能力与内生菌介导的植物耐水能力的提高无关。
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来源期刊
Austral Ecology
Austral Ecology 环境科学-生态学
CiteScore
2.90
自引率
6.70%
发文量
117
审稿时长
12-24 weeks
期刊介绍: Austral Ecology is the premier journal for basic and applied ecology in the Southern Hemisphere. As the official Journal of The Ecological Society of Australia (ESA), Austral Ecology addresses the commonality between ecosystems in Australia and many parts of southern Africa, South America, New Zealand and Oceania. For example many species in the unique biotas of these regions share common Gondwana ancestors. ESA''s aim is to publish innovative research to encourage the sharing of information and experiences that enrich the understanding of the ecology of the Southern Hemisphere. Austral Ecology involves an editorial board with representatives from Australia, South Africa, New Zealand, Brazil and Argentina. These representatives provide expert opinions, access to qualified reviewers and act as a focus for attracting a wide range of contributions from countries across the region. Austral Ecology publishes original papers describing experimental, observational or theoretical studies on terrestrial, marine or freshwater systems, which are considered without taxonomic bias. Special thematic issues are published regularly, including symposia on the ecology of estuaries and soft sediment habitats, freshwater systems and coral reef fish.
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