To decrease the dependency on chemical pesticides, the resistance of cultivated strawberry to pests needs to be increased. While genetic resources within domesticated varieties are limited, wild genotypes are predicted to show high heritable variation in useful resistance traits. We collected 86 wild accessions of Fragaria vesca L. from central Sweden and screened this germplasm for antibiosis (pest survival and performance) and antixenosis (pest preference) traits active against the strawberry leaf beetle (Galerucella tenella L.). First, extensive common garden experiments were used to study antibiosis traits in the sampled plant genotypes. Heritable genetic variation among plant genotypes was found for several antibiosis traits. Second, controlled cafeteria experiments were used to test for plant genetic variation in antixenosis traits. The leaf beetles avoided egg laying on plant genotypes possessing high antibiosis. This indicates a high degree of concordance between antibiosis and antixenosis and that the beetles’ egg-laying behavior optimizes the fitness of their offspring. The existence of high genetic variation in key resistance traits suggests that wild woodland strawberry contains untapped resources that are sought to reduce pesticide dependence in cultivated strawberry. Given that only a very small portion of the species’ distribution area was sampled, even higher variation may be expected at the continental scale. As a whole, the genetic resources identified in this study serve to strengthen the position of woodland strawberry as a key crop wild relative.

中文翻译：

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草莓作物野生近缘种（草莓）中食草动物抗性的遗传变异

为了减少对化学农药的依赖，需要提高栽培草莓对害虫的抵抗力。尽管驯化品种内的遗传资源有限，但预计野生基因型在有用的抗性性状上显示出高度的遗传变异。我们从瑞典中部收集了86种野生草莓（Fragaria vesca L.）的种质，并筛选了针对草莓叶甲虫（Galerucella tenella）具有活性的抗微生物（害虫存活和表现）和抗异种病（害虫偏好）特性的种质。L.）。首先，广泛的普通花园实验被用来研究所采样植物基因型中的抗生特性。发现了几种抗生性状在植物基因型之间的遗传遗传变异。其次，使用受控食堂实验来测试植物抗氧化性状的遗传变异。叶甲虫避免将卵产在具有高抗菌性的植物基因型上。这表明抗生和抗异位之间高度一致，并且甲虫的产卵行为优化了其后代的适应性。关键抗性状的高遗传变异的存在表明，野生林地草莓含有未开发的资源，旨在减少栽培草莓对农药的依赖性。假设只采样了该物种分布区域的一小部分，在大陆范围内可能会有更大的变化。总体而言，本研究确定的遗传资源有助于巩固林地草莓作为重要农作物野生近缘种的地位。