Mutations in the acetolactate synthase (ALS) enzyme affect shattercane (Sorghum bicolor) response to ALS-inhibiting herbicides

Table 1 Sequence substitutions in the acetolactate synthase (ALS) gene and resistance to herbicide active ingredient of three ALS inhibitors-resistant shattercane biotypes relative to the known susceptible biotype. Resistance was defined as having a lower percentage dry matter reduction when treated with herbicide compared to the wild type. Penoxsulam, the one herbicide in the triazolopyrimidine chemical family that claimed control of some grass species on its label, did not reduce the growth of any shattercane mutant biotype

	Sequence substitutions
Position	P2-205	P9-102	P8-30
91	Ala₃₀-Gly	Ala₃₀-Gly	Ala₃₀-Gly
554	Pro₁₉₇-Leu	Pro₁₉₇-Leu
1685			Trp₅₇₄ -Leu
1899	Glu646Asp
1642
	Resistance to herbicide active ingredient
Chemical family	P2-205	P9-102	P8-30
Imizadolinones	Imazamox^a		Imazamox
			Imazaquin
			Imazethapyr
Pyrimidinyloxybenzoic acids			Bispyribac^a
Sulfonylureas	Chlorsulfuron	Chlorsulfuron	Chlorsulfuron
	Foramsulfuron^a	Nicosulfuron	Foramsulfuron
	Primisulfuron^a	Primisulfuron^a	Nicosulfuron
			Primisulfuron
			Rimsulfuron^a
Triazolones	Propoxycarbazone	Propoxycarbazone	Propoxycarbazone
Triazolones	Thiencarbazone^a	Thiencarbazone^a	Thiencarbazone

ISSN: 1601-5223