Carbon flow in plant microbial associations

Includes bibliographical references (page 474).Measurement of the distribution of the photosynthesis product in the symbiotic association of a legume, a mycorrhizal fungus, and nitrogen-fixing bacteria showed that the fungus incorporated 1 percent of the photosynthesis product and respired 3 percent. The nodules of a 5-week-old plant utilized 7 to 12 percent of the photosynthesis product. The legume compensated in part for the needs of its microbial partners through increased rates of photosynthesis.Publisher version: http://www.jstor.org/stable/1686536

Vesicular arbuscular mycorrhizal spore populations in various Saskatchewan soils and the effect of inoculation with Glomus mosseae on faba bean growth in greenhouse and field trials

Includes bibliographical references (pages 94-95).The numbers of vesicular arbuscular mycorrhizal spores in various Saskatchewan soils, and the effect of Glomus mosseae inoculation on the growth of faba beans (Vicia faba) were studied. The size of the mycorrhizal spore population varied from site to site, but in general, more spores were found in undisturbed soils than in adjacent cultivated soils. Practices which reduced the density of potential host roots also reduced the numbers of spores found in the soil. Inoculation of faba beans with G. mosseae spores resulted in increased dry matter production both in growth chamber and field studies in the presence of indigenous mycorrhizal spores. Inoculation also resulted in higher levels of root colonization and increased total phosphorus uptake