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Recovery of Imidazolinone-Resistant Hard Red Wheat Lines Following Imazamox Application

^a Dep. of Bioagricultural Sciences and Pest Management, Colorado State Univ., Fort Collins, CO 80523
^b USDA-ARS Water Management Unit, 2150 Centre Ave., Bldg. D, Suite 320, Fort Collins, CO 80526. B.D. Hanson's current address is USDA-ARS Water Management Research Unit, 9611 S. Riverbend Ave., Parlier, CA 93648. This article is a U.S. government work and is in the public domain in the USA

View larger version (25K): [in this window] [in a new window]   Figure 1. Biomass production of hard red wheat near-isolines after imazamox treatment in the greenhouse. Data are expressed as a percent of the untreated plants 21 d after treatment (DAT) (potential biomass). Symbols and lines represent quadratic regression predictions and 95% confidence intervals.

View larger version (9K): [in this window] [in a new window]   Figure 2. Imazamox-resistant acetolactate synthase (ALS) enzyme activity in hard red wheat near-isolines following an in vitro application of 50 µmol L–1 imazamox. Data are expressed as a percentage of the untreated controls. Lines are linear regression predictions and symbols are mean and standard error values from two independent experiments with eight replications.

View larger version (9K): [in this window] [in a new window]   Figure 3. Extractable acetolactate synthase (ALS) enzyme activity in herbicide-resistant and -susceptible hard red wheat near-isolines following treatment with a 105 g ha–1 imazamox. Data are expressed as a percentage of untreated plants. Lines are predicted values based on an exponential decay nonlinear regression model (Eq. [1]) while symbols are mean and standard error values from two independent experiments with eight replications.

View larger version (9K): [in this window] [in a new window]   Figure 4. Recovery of imazamox-susceptible acetolactate synthase (ALS) enzyme activity in hard red wheat near-isolines following a 105 g ha–1 imazamox treatment. Data are expressed as a percentage of total ALS activity and are corrected for total extractable enzyme activity. Lines are predicted values based on an exponential rise nonlinear regression model (Eq. [2]) while symbols are mean and standard error values from two independent experiments with 8 replications.