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Fluazifop-P Resistance Expressed as a Dominant Trait in Sorghum (Sorghum bicolor)

Published online by Cambridge University Press:  20 January 2017

Reid J. Smeda
Affiliation:
USDA-ARS, Stoneville, MS 38776
Randall S. Currie
Affiliation:
Kansas State University Southwest Research & Extension Center, 4500 E. Mary, Garden City, KS 67846
Julia H. Rippee
Affiliation:
USDA-ARS, Stoneville, MS 38776

Abstract

Reports of resistance to grass-selective herbicides, including johnsongrass (Sorghum halepense) resistant to fluazifop-P, have become quite common. Experiments were conducted to determine if fluazifop-P resistance could be transferred from johnsongrass to crop sorghum (Sorghum bicolor) and to identify the heritability of resistance in the progeny. A population of male sterile, fluazifop-P–sensitive sorghum, AKS-82, was interplanted with fluazifop-P–resistant johnsongrass and progeny treated with 0.105 kg ai/ha fluazifop-P postemergence (POST). Surviving seedlings were backcrossed to fluazifop-P–resistant johnsongrass. Viable plants from this successful cross were then testcrossed to another sensitive sorghum, TX622. These testcross progeny were then screened for herbicide resistance by again applying fluazifop-P POST at 0.105 kg /ha. Chi-square analysis revealed that resistance to fluazifop-P was inherited by a single, dominant gene. Natural hybridization of johnsongrass and sorghum is possible, and transfer of herbicide resistance between species can occur.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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