Some Interrelationships of Growth, Salt Absorption, Respiration, and Mycorrhizal Development in Pinus Echinata Mill.

Criteria of Nutritive Relations of Fungi and Seed-Plants in Mycorrhizae

“…Most of the testas were still intact; some hyphae penetrating the coats to the embryos were seen. The identity of the cytochemical processes of the orchid mycorrhizae with those of the pines may justifiably be extended to include accelerated absorption, respiration, and metabolism as described by ROUTIEN and DAWSON (9).…”

Growth Stimulation and Phosphorus Absorption of Mycorrhizal and Non-Mycorrhizal Northern White Pine and Douglas Fir Seedlings in Relation to Fertilizer Treatment

“…A miiarked ehaing+e anid enlargement of the tree seedlinig root systemi follows imyeorrhiza formiiationi, anlid according-to variouls authors the fungus partnier makes available to the tree organic nlitrogeni (6), carbohydrates (4,11), water (1), niutrienits (2,4,5,10), anxiins alid enzyvni es (3,4,8), anid in additioni destroys toxic soil eoiliponnilds resuilting fromii eertaiii types of organic decomnpositionl (7,8).…”

Changes in soil organic phosphorus in the presence of plant roots

“…Hatch (1937) visualized the formation of mycorrhizae as so increasing the total absorb ing area of the roots that adequate amounts of salts for growth and development of the trees may be extracted from soils of comparatively low fertility, Routein and Dawson (1943) be lieved the higher metabolic activity of mycorrhizal roots to be the cause of this greater intake of minerals. Stone (1949) found that the inorganic phosphorus solubility in soil around mycorrhizal roots of Pinus radiata was no greater than it was around nonmycorrhizal roots but that formation of mycorrhizae nevertheless increased the uptake of soil phosphorus by the pine seedlings but not by other plants grown in the same culture.…”