Sipha maydissensitivity to defences ofLolium multiflorumand its endophytic fungusEpichloëoccultans

Author:

Bastías Daniel A.12,Martínez-Ghersa Maria Alejandra1,Newman Jonathan A.3,Card Stuart D.2,Mace Wade J.2,Gundel Pedro E.1

Affiliation:

1. IFEVA, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina

2. Forage Science, AgResearch Limited, Grasslands Research Centre, Palmerston North, New Zealand

3. Department of Biology, Wilfrid Laurier University, Waterloo, Ontario, Canada

Abstract

BackgroundPlants possess a sophisticated immune system to defend from herbivores. These defence responses are regulated by plant hormones including salicylic acid (SA) and jasmonic acid (JA). Sometimes, plant defences can be complemented by the presence of symbiotic microorganisms. A remarkable example of this are grasses establishing symbiotic associations withEpichloëfungal endophytes. We studied the level of resistance provided by the grass’ defence hormones, and that provided byEpichloëfungal endophytes, against an introduced herbivore aphid. These fungi protect their hosts against herbivores by producing bioactive alkaloids. We hypothesized that either the presence of fungal endophytes or the induction of the plant salicylic acid (SA) defence pathway would enhance the level of resistance of the grass to the aphid.MethodsLolium multiflorumplants, with and without the fungal endophyteEpichloë occultans, were subjected to an exogenous application of SA followed by a challenge with the aphid,Sipha maydis.ResultsOur results indicate that neither the presence ofE. occultansnor the induction of the plant’s SA pathway regulateS. maydispopulations. However, endophyte-symbiotic plants may have been more tolerant to the aphid feeding because these plants produced more aboveground biomass. We suggest that this insect insensitivity could be explained by a combination between the ineffectiveness of the specific alkaloids produced byE. occultansin controllingS. maydisaphids and the capacity of this herbivore to deal with hormone-dependent defences ofL. multiflorum.

Funder

CONICET

Canadian Emerging Leaders in the Americas Program

Agencia Nacional de Promoción Científica FONCYT

Universidad de Buenos Aires UBA

Canadian Natural Science and Engineering Research Council

Publisher

PeerJ

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

Reference77 articles.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3