Effect of cefotaxime on strawberry leaf tissue regeneration. Leaf discs were cultivated on semi-solid regeneration medium for eight weeks with two-week subculturing intervals. The percentage of leaf discs regenerating, producing only callus or showing total necrosis was calculated. The number of leaf discs on each agar plate was 20–50, and the number of replicate plates for each treatment was 3–5. The error bars show the standard deviation of the percentages of the discs for each treatment.