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Two cell lines of Datura innoxia resistant to two imidazolinone herbicides, imazapyr and imazaquin, were isolated from mutagenized, predominantly haploid cell suspension cultures. Both of the resistant variants were &gt;1000-fold more resistant than the wild-type to the two imidazolinones. The variant resistant to imazapyr showed cross-resistance to imazaquin and vice versa, but no cross-resistance to a structurally different inhibitor, chlorsulfuron, a sulfonylurea herbicide, was observed. The target enzyme, acetolactate synthase, extracted from imidazolinone-resistant cell lines was not inhibited by imazapyr or imazaquin but was sensitive to chlorsulfuron indicating separable sites of action for these inhibitors. The variation in resistance and cross-resistance of chlorsulfuron-resistant (PK Saxena, J King [1988] Plant Physiol 86: 863-867) and imidazolinone-resistant cell lines of Datura innoxia demonstrates the possibility of separate mutations of acetolactate synthase gene resulting in specific phenotypes.

Lack of Cross-Resistance of Imidazolinone-Resistant Cell Lines of Datura innoxia P. Mill. to Chlorsulfuron