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Effect of Endogone Mycorrhiza on Plant Growth. IV. Quantitative Relationships between the Growth of the Host and the Development of the Endophyte in Tomato and Maize

M. J. Daft and T. H. Nicolson
The New Phytologist
Vol. 71, No. 2 (Mar., 1972), pp. 287-295
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2430645
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Endogone Mycorrhiza on Plant Growth. IV. Quantitative Relationships between the Growth of the Host and the Development of the Endophyte in Tomato and Maize
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Abstract

Endotrophic mycorrhiza in tomato and maize, induced by chlamydosporic varieties of Endogone macrocarpa, were examined quantitatively by estimating infection of roots, pigmentation of roots and production of ectocarpic chlamydospores. When the size of the root system was taken into account, estimates of infection showed a relationship to growth of the host. The amount of pigmentation within the root system gave a good indication of mycorrhizal intensity and was related to the size of the host at high levels of infection. The numbers of spores produced on an individual root system, given a particular treatment, were positively correlated with the size of the host. The relative merits of these different assessments of mycorrhiza are discussed.

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