Abstract
In arbuscular mycorrhizal (AM) symbiosis the plasma membrane of both, roots and fungi, is regarded to be the main contact zone between the two symbionts. Therefore plant proteins for regulating symbiotic interactions are expected to be located at the plasma membrane of roots. It has been shown that plasma membrane-bound nitrate reductase (PM-NR) and nitrite: NO reductase (NI-NOR) are tightly bound to the plasma membrane, root-specific and part of the nitrate assimilation pathway (STOHR et al. 2001). Both enzymes, in interaction with each other, are involved in the extracellular formation of the signaling compound nitric oxide (NO). Although the physiological functions of both enzymes are not fully understood, it seems likely that the establishment and/or repression of mycorrhizal symbiosis might be regulated by the extracellular NO.
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