1. Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae) is a common polyphagous mite in tropical and subtropical areas and is considered as an important citrus pest.
2. To understand the response of citrus to P. latus infestation, we have characterized the volatile profile and the molecular defence mechanisms of two citrus genotypes, namely sour orange (Citrus aurantium) and Cleopatra mandarin (Citrus reshni), to P. latus infestation. These two species are important rootstocks for the citrus industry and display differential resistance to Tetranychus urticae Koch (Acari: Tetranychidae), with sour orange showing elevated levels of constitutive and induced resistance associated with the jasmonic acid (JA) pathway compared with Cleopatra mandarin.
3. P. latus infestation activated both the JA- and the salicylic acid-dependent pathways in sour orange but not in Cleopatra mandarin. However, this differential activation resulted in the production of similar volatile blends (a mixture of green leaf volatiles and aromatic compounds).
4. Contrary to T. urticae infestation, sour orange supported larger densities of P. latus than Cleopatra mandarin with similar injury levels.
5. Therefore, sour orange may be more tolerant to P. latus than Cleopatra mandarin.

中文翻译：

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柑橘类植物对阔螨 Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae) 的反应

1. Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae) 是热带和亚热带地区常见的多食性螨，被认为是重要的柑橘害虫。
2. 为了了解柑橘对P. latus侵染的反应，我们表征了两种柑橘基因型，即酸橙 ( Citrus aurantium ) 和 Cleopatra mandarin ( Citrus reshni ) 对P. latus侵染的挥发性特征和分子防御机制。这两个物种是柑橘产业的重要砧木，对叶螨科（Acari：Tetranychidae）表现出不同的抗性，与埃及艳后柑橘相比，酸橙表现出与茉莉酸 (JA) 途径相关的组成性和诱导性抗性水平升高。
3. P. latus感染激活了酸橙中的 JA 和水杨酸依赖性途径，但在 Cleopatra 柑橘中未激活。然而，这种差异激活导致产生类似的挥发性混合物（绿叶挥发物和芳香化合物的混合物）。
4. 与T. urticae感染相反，酸橙比具有相似损伤水平的 Cleopatra柑橘支持更大的P. latus密度。
5. 因此，酸橙可能比埃及艳后更能耐受P. latus。