Corymbia citriodora subsp. variegata (CCV) is an economically and ecologically important timber species, native to eastern Australia. It is highly susceptible to Quambalaria pitereka, a coevolved endemic pathogen, and Austropuccinia psidii, an exotic invasive pathogen. Genes associated with resistance to Q. pitereka are specific and uncorrelated with the genes associated with resistance to A. psidii, suggesting different resistance mechanisms to each pathogen, possibly associated with leaf phenotypic traits. This study examined leaf chemical and anatomical differences in CCV between uninoculated plants and those inoculated with Q. pitereka and A. psidii. The results demonstrate that the pathogens induce different responses in CCV. Plants inoculated with A. psidii exhibited chemical and anatomical changes that were not observed in uninoculated controls and Q. pitereka-inoculated plants, such as deposition of polyphenols and tannins in upper/lower epidermis, variation in the proportion of monoterpenes, steroids, monounsaturated hydrocarbons and long chain hydrocarbons and higher leaf toughness. In contrast, CCV response to Q. pitereka altered the distribution of polyphenols and tannins in the leaves and possible accumulation of these compounds and lignin in necrotic areas. These findings provide a better understanding of factors underlying CCV responses to coevolved and exotic pathogens and add insights into plant-pathogen interactions.

中文翻译：

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Corymbia citriodora subsp. 叶片化学和解剖结构的变化。variegata（桃金娘科）对本地和外来病原体的反应

Corymbia citriodora subsp。variegata (CCV) 是一种在经济和生态上都很重要的木材品种，原产于澳大利亚东部。它对共同进化的地方性病原体 Quambalaria pitereka 和外来入侵病原体 Austropuccinia psidii 高度敏感。与 Q. pitereka 抗性相关的基因是特异性的，与与 A. psidii 抗性相关的基因无关，表明对每种病原体的不同抗性机制，可能与叶片表型性状有关。该研究检查了未接种植物与接种 Q. pitereka 和 A. psidii 的植物之间 CCV 的叶化学和解剖学差异。结果表明，病原体在 CCV 中诱导不同的反应。用 A. 接种的植物 psidii 表现出在未接种的对照和 Q. pitereka 接种的植物中未观察到的化学和解剖学变化，例如上/下表皮中多酚和单宁的沉积，单萜、类固醇、单不饱和烃和长链烃的比例变化以及更高的叶片韧性。相比之下，CCV 对 Q.pitereka 的反应改变了叶子中多酚和单宁的分布以及这些化合物和木质素在坏死区域的可能积累。这些发现提供了对 CCV 对共同进化和外来病原体反应的潜在因素的更好理解，并增加了对植物 - 病原体相互作用的见解。单不饱和碳氢化合物和长链碳氢化合物和更高的叶子韧性。相比之下，CCV 对 Q.pitereka 的反应改变了叶子中多酚和单宁的分布以及这些化合物和木质素在坏死区域的可能积累。这些发现提供了对 CCV 对共同进化和外来病原体反应的潜在因素的更好理解，并增加了对植物 - 病原体相互作用的见解。单不饱和碳氢化合物和长链碳氢化合物和更高的叶子韧性。相比之下，CCV 对 Q.pitereka 的反应改变了叶子中多酚和单宁的分布以及这些化合物和木质素在坏死区域的可能积累。这些发现提供了对 CCV 对共同进化和外来病原体反应的潜在因素的更好理解，并增加了对植物-病原体相互作用的见解。