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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #192005
Title: PHYSIOLOGY OF GLYPHOSATE-RESISTANT PALMER AMARANTH (AMARANTHUS PALMERI)

Author
item VENCILL, W - UNIVERSITY OF GEORGIA
item GREY, T - UNIVERSITY OF GEORGIA
item CULPEPPER, A - UNIVERSITY OF GEORGIA
item SHILLING, D - UNIVERSITY OF GEORGIA
item Webster, Theodore

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 2/15/2006
Publication Date: 5/1/2006
Citation: Vencill, W.K., Grey, T.L., Culpepper, A.S., Shilling, D., Webster, T.M. 2006. Physiology of glyphosate-resistant Palmer amaranth (Amaranthus palmeri). In: Proceedings of the 2006 Beltwide Cotton Conference, January 3-6, 2006, San Antonio, Texas. p. 2254-2258.

Interpretive Summary:

Technical Abstract: Populations of Palmer amaranth (Amaranthus palmeri) that have increased tolerance to glyphosate have been detected in Georgia. These populations are not controlled by glyphosate rates of four to ten times of that required to control glyphosate-susceptible biotypes. Laboratory studies were initiated to examine the mechanism of increased glyphosate tolerance. Absorption, translocation, and metabolism studies were conducted. Preliminary studies indicate no differences in absorption, but some differences in translocation between glyphosate-susceptible and glyphosate-resistant biotypes. The two biotypes do differ in the level of shikimate present after exposure to glyphosate. The glyphosate-resistant population does not have a shikimate buildup indicating an insensitive EPSP target site or other mechanism preventing glyphosate from getting to the target site.