Effect of endomycorrhizae on the bioavailability of bound carbon-14 residues to onion plants from an organic soil treated with [14C]fonofos

Nelson, Sherman D.; Khan, Shahamat U.

doi:10.1021/jf00093a065

Cited by 11 publications

(7 citation statements)

References 10 publications

(18 reference statements)

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“…The direct VAM hyphal uptake of atrazine suggests that hyphal mediated uptake also contribute for the increase in herbicide uptake by mycorrhizal roots. Evidence for VAM hyphal mediated uptake of pesticide residues from soil was also presented in previous studies (21,22).…”

Section: Herbicide Uptake By Vam External Hyphaesupporting

confidence: 70%

Interactions of vesicular arbuscular mycorrhizal fungi, herbicides and crops

Nedumpara

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Section: Herbicide Uptake By Vam External Hyphaesupporting

confidence: 70%

Interactions of vesicular arbuscular mycorrhizal fungi, herbicides and crops

Nedumpara

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“…The release of NER was intensively studied from early on. The following articles are considered key in this field: microbial and physicochemical release (98)(99)(100)(101)(102)(103); bioavailibity (104-106); plant uptake (30,76,98,(107)(108)(109)(110)(111)(112)(113)(114); or earthworms uptake (98,109,115,116).…”

Section: Introductionmentioning

confidence: 99%

Formation of Pesticide Nonextractable (Bound) Residues in Soil: Magnitude, Controlling Factors and Reversibility

Barriuso

Benoît

Dubus

2008

Environ. Sci. Technol.

248

181

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The analysis of the coherent data on nonextractable (bound) residues (NER) from the literature and EU pesticide registration dossiers allows the identification of general trends, in spite of the large variability and heterogeneity of data. About 50% of the pesticides reviewed exhibit a low proportion of NER (less than 30% of the initial amount) while only 12% of pesticides have a proportion of NER exceeding 70%. The lowest proportion of NER was found for dinitroanilines (<20%), and the largest value was obtained for carbamates, and in particular dithiocarbamates. The presence of chemical reactive groups, such as aniline or phenol, tends to yield a larger proportion of NER. NER originating from N-heteroatomic ring were found to be lower than those from phenyl-ring structures. Among the environmental factors affecting the formation of NER, microbial activity has a direct and significant effect. Concerning the NER uptake or their bioavailability, consistent data suggest that only a small percentage of the total amounts of NER can be released. The analysis of NER formation kinetics showed that incubation experiments are often stopped too early to allow a correct evaluation of the NER maturation phase. Therefore, there is a need for longer term experiments to evaluate the tail of the NER formation kinetics. Still, the heterogeneity of the NER data between pesticides and for specific pesticides calls for great care in the interpretation of the data and their generalization.

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“…Busse and Ellis (7) suggested that VAM inoculation could enhance residual soil atrazine uptake into soybeans. Recently, Nelson and Khan (33) showed that hyphae of Glomus species were able to remove bound 14 C-residues of the insecticide fonofos (O-ethyl-S-phenylethylphosphonodithioate) from soil and transport them to onion plants. We also reported that presence of a VAM infection and 14 C-residue uptake via the VAM hyphal system altered 14 C allocation patterns within onion.…”

Section: Introductionmentioning

confidence: 99%

Uptake of Atrazine by Hyphae ofGlomusVesicular-Arbuscular Mycorrhizae and Root Systems of Corn (Zea maysL.)

Nelson¹,

Khan²

1992

Weed sci.

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A system, including a specialized treatment vessel for pesticide uptake studies, was developed and experiments were carried out to determine the ability ofGlomus intraradices(Schenck & Smith),G. vesiculiferium(Thaxter), and indigenous vesicular-arbuscular mycorrhizae (VAM) fungi to influence14C-atrazine uptake and transfer to corn. Uptake by root systems with and without VAM infection was compared to uptake by VAM hyphal systems by controlling access to14C-atrazine-treated soil. Hyphal systems ofGlomusspecies were able to remove14C-residue from soil and transfer these to corn. Amount of14C-residue transferred to corn through hyphal systems was highly correlated to the level of VAM root infection which varied among VAM species. In root systems, variations in14C-residue uptake resulting from mycorrhization were largely explained in terms of the negative correlation between level of infection and root mass located in14C-atrazine-treated soil. Allocation of14C-residue to shoot tissues of corn was greater when14C-residues were taken up through root systems rather than through hyphal systems. There were significant effects of VAM species on14C-residue compartmentalization between methanol extractable and nonextractable portions of corn tissues. Data from these experiments in a confined soil system were related to VAM cost-benefit relationships and indicate a significant role for VAM in determining atrazine fate in agricultural systems.

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Effect of endomycorrhizae on the bioavailability of bound carbon-14 residues to onion plants from an organic soil treated with [14C]fonofos

Cited by 11 publications

References 10 publications

Interactions of vesicular arbuscular mycorrhizal fungi, herbicides and crops

Interactions of vesicular arbuscular mycorrhizal fungi, herbicides and crops

Formation of Pesticide Nonextractable (Bound) Residues in Soil: Magnitude, Controlling Factors and Reversibility

Uptake of Atrazine by Hyphae ofGlomusVesicular-Arbuscular Mycorrhizae and Root Systems of Corn (Zea maysL.)

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