The effect of herbicides on ectotrophic mycorrhizas

Smith, John Robert

(1973)

Smith, John Robert (1973) The effect of herbicides on ectotrophic mycorrhizas.

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Abstract

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.

Information about this Version

This is a Accepted version
This version's date is: 1973
This item is not peer reviewed

Link to this Version

https://repository.royalholloway.ac.uk/items/546483d9-8a8c-493e-909b-f104cdba3983/1/

Item TypeThesis (Doctoral)
TitleThe effect of herbicides on ectotrophic mycorrhizas
AuthorsSmith, John Robert
Uncontrolled KeywordsBotany; Biological Sciences; Ectotrophic; Ectotrophic Mycorrhizas; Effect; Ectotrophic Mycorrhizas; Herbicides; Herbicides; Mycorrhizas
DepartmentsDepartment of Botany

Identifiers

Deposited by () on 31-Jan-2017 in Royal Holloway Research Online.Last modified on 07-Feb-2017

Notes

Digitised in partnership with ProQuest, 2015-2016. Institution: University of London, Bedford College (United Kingdom).


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