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Angiosperm Flora of India

Glyphosate-Resistant Italian Ryegrass ("Lolium perenne") Populations also Exhibit Resistance to Glufosinate

Publication Type:Journal Article
Year of Publication:2011
Authors:Avila-Garcia, WV, Mallory-Smith, C
Journal:Weed Science
Volume:59
Issue:3
Date Published:2011
ISBN Number:00431745
Keywords:Lolium, Lolium perenne
Abstract:

Resistance to glufosinate has been confirmed in glyphosate-resistant Italian ryegrass populations collected in hazelnut orchards in Oregon. Dose—response, ammonia accumulation, and enzyme activity studies were conducted to test the sensitivity of three glyphosate-resistant and three susceptible Italian ryegrass populations to glufosinate. The glufosinate rates required to reduce the growth by 50% (GR 50 ) were 0.15, 0.18, and 0.21 for the control populations C1, C2, and C3, respectively, whereas for the resistant populations OR1, OR2, and OR3, the GR 50 values were 0.49, 0.42, and 0.40 kg ai ha −1 , respectively, exhibiting an average resistance index of 2.4. The same trend was observed in ammonia accumulation studies between 48 and 96 h after glufosinate treatment where the susceptible populations accumulated on average two times more ammonia than the resistant populations. The glufosinate concentration required to reduce the glutamine synthetase enzyme activity by 50% (I 50 ) was not different for the resistant and susceptible populations. The I 50 s ranged from 3.1 to 3.6 μM for the resistant populations and from 3.7 to 4.3 μM for the susceptible populations; therefore, an insensitive target site is not responsible for the glufosinate resistance.

URL:http://www.jstor.org/stable/23018749
Short Title:Weed Science
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