Lichenicolous (lichen-dwelling) fungi have been extensively researched taxonomically over many years, and phylogenetically in recent years, but the biology of the relationship between the invading fungus and the lichen host has received limited attention, as has the effects on the chemistry of the host, being difficult to examine in situ. Raman spectroscopy is an established method for the characterization of chemicals in situ, and this technique is applied to a lichenicolous fungus here for the first time. Xanthoriicola physciae occurs in the apothecia of Xanthoria parietina, producing conidia at the hymenium surface. Raman spectroscopy of apothecial sections revealed that parietin and carotenoids were destroyed in infected apothecia. Those compounds protect healthy tissues of the lichen from extreme insolation and their removal may contribute to the deterioration of the apothecia. Scytonemin was also detected, but was most probably derived from associated cyanobacteria. This work shows that Raman spectroscopy has potential for investigating changes in the chemistry of a lichen by an invading lichenicolous fungus.

中文翻译：

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拉曼光谱分析地衣真菌黄单胞菌（Xanthoriicola physciae）对地衣宿主的影响。

多年以来，近年来一直在分类学上对地衣真菌进行了广泛的研究，近年来在系统发生学上也进行了广泛的研究，但是，入侵真菌与地衣宿主之间关系的生物学受到了有限的关注，因为其对地衣真菌的化学作用产生了影响。主机，难以原位检查。拉曼光谱法是一种既定的原位化学表征方法，该技术首次在这里用于地衣真菌。Xanthoriicola physciae中的子囊盘出现Xanthoria parietina，在处女膜表面产生分生孢子。可疑部位的拉曼光谱显示，被感染的可可碱中的paretin和类胡萝卜素被破坏。这些化合物可保护地衣的健康组织免受极端日晒的影响，将其去除可能会导致角质层变质。还检测到了胞嘧啶，但很可能源自相关的蓝细菌。这项工作表明，拉曼光谱法有潜力研究侵袭性地衣真菌的地衣化学变化。