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Microbial adaptation for accelerated atrazine mineralization/ degradation in Mississippi Delta soils

Published online by Cambridge University Press:  20 January 2017

Robert M. Zablotowicz ,
Mark A. Weaver  and
Martin A. Locke
Robert M. Zablotowicz
Affiliation:
USDA-Agricultural Research Service, Southern Weed Science Research Unit, P.O. Box 350, Stoneville, MS 38776; [email protected]
Mark A. Weaver
Affiliation:
USDA-Agricultural Research Service, Southern Weed Science Research Unit, P.O. Box 350, Stoneville, MS 38776
Martin A. Locke
Affiliation:
USDA-Agricultural Research Service, National Sedimentation Laboratory, Water Quality and Ecology Research Unit, Oxford, MS 38655
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Abstract

Most well-drained Mississippi Delta soils have been used for cotton production, but corn has recently become a desirable alternative crop, and subsequently, atrazine use has increased. Between 2000 and 2001, 21 surface soils (0 to 5 cm depth) with known management histories were collected from various sites in Leflore, Sunflower, and Washington counties of Mississippi. Atrazine degradation was assessed in 30-d laboratory studies using 14C-ring–labeled herbicide. Mineralization was extensive in all soils with a history of one to three atrazine applications with cumulative mineralization over 30 d ranging from 45 to 72%. In contrast, cumulative mineralization of atrazine from three soils with no atrazine history was only 5 to 10%. However, one soil with no history of atrazine application mineralized 54 and 29% of the atrazine in soils collected in 2000 and 2001, respectively. Methanol extracted 15 to 23% of the 14C-atrazine 7 d after treatment in soils having two applications within the past 6 yr, whereas 65 to 70% was extracted from no-history soils. First-order kinetic models indicated soil with 2 yr of atrazine exposure exhibited a half-life of less than 6 d. Most probable number (MPN) estimates of atrazine-ring mineralizing-microorganisms ranged from 450 to 7,200 propagules g−1 in atrazine-exposed soils, and none were detected in soils with no history of atrazine use. Although most soils exhibited rapid atrazine mineralization, analysis of DNA isolated from these soils by direct or nested polymerase chain reaction (PCR) failed to amplify DNA sequences with primers for the atzA atrazine chlorohydrolase gene. These results indicate that microbial populations capable of accelerated atrazine degradation have developed in Mississippi Delta soils. This may reduce the weed control efficacy of atrazine but also reduce the potential for off-site movement. Studies are continuing to identify the genetic basis of atrazine degradation in these soils.

Keywords

AtrazinecyanazineDEA, de-ethyl atrazineDIA, de-isopropyl atrazinecorn, Zea mays L.cotton, Gossypium hirsutum L.Accelerated degradationatrazinemicrobial metabolismmineralization
Type
Soil, Air, and Water
Information
Weed Science , Volume 54 , Issue 3 , June 2006 , pp. 538 - 547
Copyright
Copyright © Weed Science Society of America 

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