UPTAKE AND TRANSLOCATION OF 32P-LABELED PHOSPHATE TO ONION ROOTS BY ENDOMYCORRHIZAL FUNGI

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Abstract
Segments of onion roots infected with the endomycorrhizal fungi Endogone mosseae and E. fasciculata had high levels of radioactivity when 32P-labeled phosphate was incorporated in soil 27 mm from the root surface. Autoradiography indicated diffusion of 7.5 mm or less from the point of application. Nonmycorrhizal roots had little radioactivity. When hyphae growing from mycorrhizae were severed, mycorrhizal roots did not differ significantly in 32P-labeled phosphate content from nonmycorrhizal roots. Our evidence indicates that the mycelial network of endomycorrhizal fungi enables plants to remove phosphate from a larger soil volume, extending beyond the immediate vicinity of the root surface. Segments of onion roots infected with the endomycorrhizal fungi Endogone mosseae and E. fasciculata had high levels of radioactivity when 32P-labeled phosphate was incorporated in soil 27 mm from the root surface. Autoradiography indicated diffusion of 7.5 mm or less from the point of application. Nonmycorrhizal roots had little radioactivity. When hyphae growing from mycorrhizae were severed, mycorrhizal roots did not differ significantly in 32P-labeled phosphate content from nonmycorrhizal roots. Our evidence indicates that the mycelial network of endomycorrhizal fungi enables plants to remove phosphate from a larger soil volume, extending beyond the immediate vicinity of the root surface. © Williams & Wilkins 1973. All Rights Reserved.

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