Glyphosate treatments for weed control affect early stages of root colonization by Tuber melanosporum but not secondary colonization.

Abstract:

:The cultivation of the ectomycorrhizal fungus Tuber melanosporum has considerably spread in recent years throughout the world. During the first years of truffle cultivation, weed control is a key practice to improve the establishment of host trees and the proliferation of the fungus in the soil. Glyphosate is nowadays the most commonly used herbicide in Spanish truffle orchards. We explored the effect of glyphosate on the proliferation of T. melanosporum mycorrhizae, on extraradical mycelium and on the inoculum potential of T. melanosporum spores in greenhouse experiments using Quercus ilex seedlings as host plants. No detrimental effect on the secondary infection of T. melanosporum was found after three sequential glyphosate applications in young seedlings during one vegetative period. Instead, a change in the distribution of fine roots and T. melanosporum mycorrhizae along soil depth was observed. On the other hand, results indicate that high application rates of glyphosate hinder the infectivity of T. melanosporum spore inoculum, without apparent impact on the host performance. Our results suggest that glyphosate has the potential to jeopardise the role of the soil spore bank as inoculum source for the colonisation of new roots, also raising the question of whether glyphosate could hinder the presumed role of spores in sexual mating.

journal_name

Mycorrhiza

journal_title

Mycorrhiza

authors

Gómez-Molina E,Sánchez S,Parladé J,Cirujeda A,Puig-Pey M,Marco P,Garcia-Barreda S

doi

10.1007/s00572-020-00990-8

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

725-733

issue

6

eissn

0940-6360

issn

1432-1890

pii

10.1007/s00572-020-00990-8

journal_volume

30

pub_type

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