GROWTH OF SUBTERRANEAN CLOVER IN RELATION TO THE FORMATION OF ENDOMYCORRHIZAS BY INTRODUCED AND INDIGENOUS FUNGI IN A FIELD SOIL

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Abstract
SUMMARY: Three vesicular arbuscular (VA) endophytes differed in their ability to increase the growth of subterranean clover when introduced into a freshly collected field soil. Four indigenous endophytes infected the roots in both the control and inoculated treatments. Two of the introduced endophytes, isolates of Glomus monosporus, differed in their ability to increase growth and phosphorus content of subterranean clover. These endophytes were both superior to the third introduced endophyte, G. fasciculatus.Differences in the growth of subterranean clover when limited by phosphorus supply were related to the rate of mycorrhiza development. Inoculation of soil with the three introduced endophytes did not reduce initial infection by the four indigenous endophytes. Mycorrhizas formed by G. monosporus and G. fasciculatus were distinguished from those formed by indigenous endophytes on the basis of morphology.Plants inoculated with isolates of G. monosporus had a greater proportion of their dry weight and phosphorus content in the tops than plants inoculated with G. fasciculatus or the control plants.

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