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1 July 2001 Photosynthetic inhibition and ammonium accumulation in Palmer amaranth after glufosinate application
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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.

Nomenclature: Glufosinate; Palmer amaranth, Amaranthus palmeri S. Wats. AMAPA.

Elmé Coetzer and Kassim Al-Khatib "Photosynthetic inhibition and ammonium accumulation in Palmer amaranth after glufosinate application," Weed Science 49(4), 454-459, (1 July 2001). https://doi.org/10.1614/0043-1745(2001)049[0454:PIAAAI]2.0.CO;2
Received: 24 October 2000; Published: 1 July 2001
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