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Plants homozygous for null mutations in genes coding for the α and β subunits of the heterotrimeric G protein exhibit different sensitivities to Tm-induced growth inhibition. Homozygous gpa1-4 (Gα-null mutation), agb1-2 (Gβ-null mutation), and gpa1-4/agb1-2 double mutants were germinated on agar medium containing 0.3 μg/ml Tm for 6 days and then transferred to medium without Tm, allowed to recover for 10 days, and photographed.
