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Abstract. In a water-exclusion experiment, five different ecotypes of beech (Fagus sylvatica L.; representing regions of different environmental and climatic conditions in Baden-Wrttemberg, Germany) were subjected to drought conditions of different severity between July and September of two consecutive years. Drought stress as characterised by the water content and the pre-dawn water potential of...
Arbuscules are the most conspicuous structures of arbuscular mycorrhizas. Due to their large surface area, they are regarded as putative sites of nutrient exchange between host and symbiont. A new staining technique for arbuscules is presented in which arbuscules are selectively stained by acidotropic (i.e. based on the ion-trap mechanism) accumulation of neutral red (activity stain). Criteria to...
Abstract.The most widespread type of mycorrhiza is the so-called vesicular-arbuscular mycorrhiza. In this endomycorrhiza, fungal hyphae penetrate plant cell walls in the root cortex. There they form densely branched arbuscules. Fungus and plant plasma membrane are separated by a common interfacial apoplast. The pH of the compartment between the symbionts is of pivotal importance for nutrient transfer...
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