Mycorrhizal fungi of white oak

Influence of fungal exudates on growth of excised roots of white oak

“…With the exception of Ç. graniforme and P. cinnabarinus the fungi were obtained from a fungal collection of a study on mycorrhizal fungi of white oak in Iowa (Howe, 1964 The fungi were maintained on a modified Bonner's medium solidified with 15 g of agar. The medium was similar to that used for root growth with the exception of the carbohydrate, k sucrose-glucose combination with a ratio of 1 to 1 was substituted for the pure sucrose and the total carbohydrate concentration was reduced from 4 to 3 per cent (w/v) (Cochrane, 1958).…”

“…Fungal species shown to form mycorrhizae with white oak and induce the typical dichotomous branching effect have been identified (Howe, 1964). Exploration of the fungal populations within white oak stands in Iowa has revealed basidiocarps of A. meIlea in the presence of vigorous living trees (Howe, 1964). .…”

Variant nutrient effects upon the mycorrhizae of white oak (Quercus alba L.)

“…In addition, soil samples were taken from six white oak sites in eastern and central Iowa (Howe, 1964). These samples were assayed for the presence of Endogone spp., known endomycorrhizae-forming fungi.…”

“…Similar fungal cultures were used to Induce nycorrhizal formation in synthetic cultures of southern pine (Bryan and Zak, 1961), slash pine (Vozzo and Hacskaylo, 1971), white oak (Howe, 1964;Woodward, 1965Woodward, , 1966Randall, 1967), oak (Gnutenko and Fankova, 1955), oak and pine (Rrangauz, 1955) and Douglas fir (Trappe, 1967). The fungi were isolated in all cases from sporocarp tramai tissue onto an agar medium.…”

“…Acorns from the same trees were used in previous studies at Iowa State University (Howe, 1964;Woodward, 1965Woodward, , 1966Randall, 1967 …”