Drought in the forest is not only a prolonged state of water shortage, but also an occasion where interactions between plants and fungi are affected. Water efficiency accelerates a range of pathologies in interactions between organisms, influencing the ecosystems and their interacting biological components. This study focuses on the role of mycorrhizal and endophyte fungi in alleviating the effects of soil water shortage, and on the impact of their altered activity during drought on the health of trees. The issues presented here show the fundamental role of the mycorrhizal mycelium and the mechanism of water transport to the plant in the course of other phenomena (withering, pathogenesis, endophytes biology) that occur in trees under influence of drought, with particular attention on managed coniferous stands. Conclusions resulting from published information on this topic emphasize the negative impact of soil moisture deficiency on the ectomycorrhizal fungi functioning and, in contrast, on the promotion of the growth of some endophytes, pathogens and hemi-parasitic mistletoes (Viscum spp.).

森林中的干旱不仅是长期缺水的状态，也是植物和真菌之间相互作用受到影响的场合。用水效率加速了生物之间相互作用的一系列病理，影响了生态系统及其相互作用的生物成分。本研究侧重于菌根和内生真菌在缓解土壤缺水影响方面的作用，以及它们在干旱期间改变的活性对树木健康的影响。这里提出的问题显示了菌根菌丝体的基本作用以及在干旱影响下的树木中发生的其他现象（枯萎、发病机制、内生菌生物学）过程中向植物输送水分的机制，特别关注受管理的针叶树站立。Viscum spp.)。