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Phenotypical analysis of Arabidopsis thaliana wild-type and mutant plants. (a) Four-week-old wild-type (URH) and single mutant (urh1 and urh2) plants grown on soil under an 8-h light regime. (b) Four-week-old wild-type (URH) and double mutant (urh1× urh2 and urh2× urh1) plants grown on sterile nutrient agar under a 12-h light regime, and after transfer to soil for four more weeks under an 8-h light regime. URH, nucleoside hydrolase.
