First two sentences: Deal et al. (2), and Possingham and Obbink (8) have shown that grape vines growing in the field are normally mycorrhizal. It has been shown also (3,8) that mycorrhizal fungi can stimulate growth of grapes growing in sterilized soil. It was suggested that mycorrhizal symbiosis is responsible for improved phosphorus nutrition, and perhaps other mineral nutrition as well, in grapes.
