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Uptake of Atrazine by Hyphae of Glomus Vesicular-Arbuscular Mycorrhizae and Root Systems of Corn (Zea mays L.)

Published online by Cambridge University Press:  12 June 2017

Sherman D. Nelson  and
Shahamat U. Khan
Sherman D. Nelson
Affiliation:
Land Resource Res. Ctr., Res. Branch, Agric. Canada, Central Exp. Farm, Ottawa, ON K1A 0C6. LRRC Contribution No. 91–03
Shahamat U. Khan
Affiliation:
Land Resource Res. Ctr., Res. Branch, Agric. Canada, Central Exp. Farm, Ottawa, ON K1A 0C6. LRRC Contribution No. 91–03
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Abstract

A system, including a specialized treatment vessel for pesticide uptake studies, was developed and experiments were carried out to determine the ability of Glomus intraradices (Schenck & Smith), G. vesiculiferium (Thaxter), and indigenous vesicular-arbuscular mycorrhizae (VAM) fungi to influence 14C-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 to 14C-atrazine-treated soil. Hyphal systems of Glomus species were able to remove 14C-residue from soil and transfer these to corn. Amount of 14C-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 in 14C-residue uptake resulting from mycorrhization were largely explained in terms of the negative correlation between level of infection and root mass located in 14C-atrazine-treated soil. Allocation of 14C-residue to shoot tissues of corn was greater when 14C-residues were taken up through root systems rather than through hyphal systems. There were significant effects of VAM species on 14C-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.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminecorn, Zea mays L. ‘CO255’VAM infectionherbicide allocationherbicide transportcarbon allocationherbicide uptakeGlomus intraradicesGlomus vesiculiferium
Type
Special Topics
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 161 - 170
Copyright
Copyright © 1992 by the Weed Science Society of America 

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