Acetolactate Synthase Inhibiting Herbicides Bind to the Regulatory Site | Zendy

Mani Subramanian | Zendy; Vivian I. LoneyGallant | Zendy; Jennifer Dias | Zendy; Linda C. Mireles | Zendy

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Acetolactate Synthase Inhibiting Herbicides Bind to the Regulatory Site

Author(s) -

Mani Subramanian,

Vivian I. LoneyGallant,

Jennifer Dias,

Linda C. Mireles

Publication year - 1991

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.96.1.310

Subject(s) - acetolactate synthase , valine , leucine , nicotiana tabacum , atp synthase , biology , weed , biochemistry , enzyme , amino acid , botany , gene

Acetolactate synthase from spontaneous mutants of tobacco (Nicotiana tabacum; KS-43 and SK-53) and cotton (Gossypium hirsutum; PS-3, PSH-91, and DO-2) selected in tissue culture for resistance to a triazolopyrimidine sulfonanilide showed varying degrees of insensitivity to feedback inhibitor(s) valine and/or leucine. A similar feature was evident in the enzyme isolated from chlorsulfuron-resistant weed biotypes, Kochia scoparia and Stellaria media. Dual inhibition analyses of triazolopyrimidine sulfonanilide, thifensulfuron, and imazethapyr versus feedback inhibitor leucine revealed that the three herbicides were competitive with the amino acid for binding to acetolactate synthase from wild-type cotton cultures. Acetolactate synthase inhibiting herbicides may bind to the regulatory site on the enzyme.

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