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1 April 2000 Fluazifop-P Resistance Expressed as a Dominant Trait in Sorghum (Sorghum bicolor)
REID J. SMEDA, RANDALL S. CURRIE, JULIA H. RIPPEE
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Abstract

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.

Nomenclature: Fluazifop-P; johnsongrass, Sorghum halepense (L.) Pers. #3 SORHA; grain sorghum, Sorghum bicolor (L.) Moench ‘AKS-82’, ‘TX622’.

Additional index words: Hybridization, outcrossing, SORHA.

Abbreviations: ACCase, acetyl coenzyme-A carboxylase (EC 6.4.1.2); AOPP, aryloxyphenoxypropionate; CHD, cyclohexanedione; POST, postemergence.

REID J. SMEDA, RANDALL S. CURRIE, and JULIA H. RIPPEE "Fluazifop-P Resistance Expressed as a Dominant Trait in Sorghum (Sorghum bicolor)," Weed Technology 14(2), 397-401, (1 April 2000). https://doi.org/10.1614/0890-037X(2000)014[0397:FPREAA]2.0.CO;2
Published: 1 April 2000
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