TRANSLOCATION OF CALCIUM AND PHOSPHATE BY EXTERNAL HYPHAE OF VESICULAR-ARBUSCULAR MYCORRHIZAE

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Abstract
45Ca and 32P were injected into soil 4.5 cm from onion [Allium cepa cv. Early Yellow Globe] root surfaces at rates designed to label available pools of Ca and P at equivalent specific activities. Both tracers were detected in mycorrhizal [glomus fasciculatus] but not nonmycorrhizal plants after 5 days. 45Ca was detected less frequently and in much lower amounts than 32P, indicating that Ca is not translocated to roots through mycorrhizal hyphae as readily as P.

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