Natural variation in life history strategy of Arabidopsis thaliana determines stress responses to drought and insects of different feeding guilds.
Natural variation in life history strategy of Arabidopsis thaliana determines stress responses to drought and insects of different feeding guilds.
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DOI：
10.1111/mec.14100
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发表时间：
2017-06
影响因子：
4.9
通讯作者：
Dicke M
中科院分区：
文献类型：
--
作者：
Davila Olivas NH;Frago E;Thoen MPM;Kloth KJ;Becker FFM;van Loon JJA;Gort G;Keurentjes JJB;van Heerwaarden J;Dicke M
植物是固着生物，因此，在其当地的栖息地暴露于过多的压力。因此，一个物种的不同种群受到不同的选择压力，导致对当地条件的适应和种内分化。一年生十字花科植物拟南芥是一个有吸引力的模式，生态学家和进化生物学家，由于大量收集的重新测序的自然加入。拟南芥的加入显示了两种不同的生命周期策略之一：夏季和冬季一年生植物。我们将308份欧洲拟南芥种质（已针对250K SNP进行基因分型）暴露于一系列胁迫：一种非生物胁迫（干旱）、四种生物胁迫（菜青虫毛虫、小菜蛾毛虫、花蓟马和桃蚜）和两种组合胁迫（干旱加菜青虫和灰葡萄孢真菌加菜青虫）。我们确定了对不同压力反应的遗传变异，通过狭义遗传力估计。我们发现，加入显示不同的生活史策略不同，他们的反应压力。冬季的一年生植物对干旱、蚜虫和蓟马的抵抗力更强，夏季的一年生植物对小菜蛾和小菜蛾毛虫的抵抗力更强。夏季的一年生植物也更能抵抗干旱加上P.raidea和真菌灰葡萄孢的感染加上P.raidea的草食性的综合胁迫。对干旱的适应表现出纵向梯度。最后，记录了对干旱的反应和对专业食草动物P. raidon毛虫的食草反应之间的权衡。
Plants are sessile organisms and, consequently, are exposed to a plethora of stresses in their local habitat. As a result, different populations of a species are subject to different selection pressures leading to adaptation to local conditions and intraspecific divergence. The annual brassicaceous plant Arabidopsis thaliana is an attractive model for ecologists and evolutionary biologists due to the availability of a large collection of resequenced natural accessions. Accessions of A. thaliana display one of two different life cycle strategies: summer and winter annuals. We exposed a collection of 308 European Arabidopsis accessions, that have been genotyped for 250K SNPs, to a range of stresses: one abiotic stress (drought), four biotic stresses (Pieris rapae caterpillars, Plutella xylostella caterpillars, Frankliniella occidentalis thrips and Myzus persicae aphids) and two combined stresses (drought plus P. rapae and Botrytis cinerea fungus plus P. rapae). We identified heritable genetic variation for responses to the different stresses, estimated by narrow‐sense heritability. We found that accessions displaying different life cycle strategies differ in their response to stresses. Winter annuals are more resistant to drought, aphids and thrips and summer annuals are more resistant to P. rapae and P. xylostella caterpillars. Summer annuals are also more resistant to the combined stresses of drought plus P. rapae and infection by the fungus Botryris cinerea plus herbivory by P. rapae. Adaptation to drought displayed a longitudinal gradient. Finally, trade‐offs were recorded between the response to drought and responses to herbivory by caterpillars of the specialist herbivore P. rapae.