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Photosynthetic inhibition and ammonium accumulation in Palmer amaranth after glufosinate application

Published online by Cambridge University Press:  20 January 2017

Elmé Coetzer  and
Kassim Al-Khatib
Elmé Coetzer
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66505
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Abstract

Greenhouse experiments were conducted to determine the effects of glufosinate on ammonium accumulation and photosynthetic inhibition in Palmer amaranth. Glufosinate applied at 410 g ha−1 reduced glutamine synthetase activity and enhanced ammonium content 30 min after treatment. Glufosinate application resulted in rapid inhibitions of the photosynthetic rate and stomatal conductance during the first 2 h after treatment (HAT), whereas the ammonium concentration increased over the same time period. Ammonium content 6 HAT was 22 times higher in treated plants than in untreated plants, whereas the photosynthetic rate of treated plants decreased by 63%. At 24 HAT, the ammonium content was 53 times higher in treated plants than in untreated plants; however, no further inhibition of photosynthesis occurred. Photosynthetic inhibition in Palmer amaranth coincided with the rapid accumulation of ammonium and decrease in stomatal conductance shortly after glufosinate application.

Keywords

GlufosinatePalmer amaranth, Amaranthus palmeri S. Wats. AMAPAAbsorptionglutamine synthetasequantum yieldstomatal conductancetranslocationuncoupler
Type
Research Article
Information
Weed Science , Volume 49 , Issue 4 , August 2001 , pp. 454 - 459
Copyright
Copyright © Weed Science Society of America 

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