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Title: The effect of herbicides on ectotrophic mycorrhizas
Author: Smith, John Robert
Awarding Body: University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1973
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The form and seasonal development of in vivo mycorrhizas of P. sylvestris seedlings growing in forest nursery plots 458FY70 (Kennington) and 83FY7O (Wareham) have been characterised; this enabled various characters of P. sylvestris seedlings (for example non mycorrhizal short roots, mycorrhizal roots, 'pioneer' and 'mother' and subordinate 'mother' roots) to be compared for different soil conditions. Examination of the heteroihyzic root systems of P. sylvestris and P. nigra showed that long roots, for example 'pioneer' roots, are possibly more capable of adapting to a variety of soil conditions. The effects of Simazine on measured aspects of the root systems of nursery grown P. sylvestris and P. nigra are unclear; equivalent Pines growing in the same soils contained in plant pots showed a demonstrable increase in both numbers of short roots and in mycorrhizas on the application of Simazine equivalent to 4 lbs Simazine per acre. Growth measurements of known mycorrhizal and root pathogenic fungal isolates,on agar plates with added herbicides, showed that increase in growth of some isolates ocourred in the presence of higher concentrations of Simazine or Atrazine. In contrast, equivalent experiments using Diehlobenil, Dichlobenzoate, Chlorthiamid and 245T indicated that identical isolates, growing in the presence of these herbicides, were inhibited. These observations of herbicidal activity on mycorrhizas and their mycobionts were confirmed by measurement of respiration rates for Boletus elegans and Amanita rubescens, both mycobionts (the latter in very exceptional circumstances), and mycorrhizal roots of P. sylvestris. The extent of phosphate uptake by P. sylvestris mycorrhizas, estimated from buffered phosphate solutions containing herbicide, was also in agreement with the results. Using a number of established techniques, attempts to produce reliable numbers of in vitro mycorrhizas were of limited success.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Botany