FIGURE 6.

Effects of cold on cytokinin content in the wild-type Arabidopsis plants. A, content of various forms of trans-zeatin. One gram of 10-day-old light-grown Arabidopsis Col-0 seedlings (10 days after germination) per sample was pooled, and three independent biological samples were obtained for each treatment of cold temperature at 1 °C for a given period of time. The data shown are the means (pmol/g fresh weight) ± S.D. * denotes statistically significant changes with p < 0.05 compared with the wild type. tZ, trans-zeatin; tZR, trans-zeatin riboside; tZOG, trans-zeatin O-glucoside; tZROG, trans-zeatin riboside O-glucoside; tZ9G, trans-zeatin 9-glucoside; tZR5′MP, trans-zeatin riboside 5′-monophosphate; cZ, cis-zeatin; cZR, cis-zeatin riboside; cZOG, cis-zeatin O-glucoside; cZROG, cis-zeatin riboside O-glucoside; cZ9G, cis-zeatin 9-glucoside; cZR5′MP, cis-zeatin riboside 5′-monophosphate; DHZ, dihydrozeatin; DHZR, dihydrozeatin riboside; DHZOG, dihydrozeatin O-glucoside; DHZROG, dihydrozeatin riboside O-glucoside; DHZ9G, dihydrozeatin 9-glucoside; DHZR5′MP, dihydrozeatin riboside 5′-monophosphate; iP, N⁶-(Δ²isopentenyl)adenine; iPR, N⁶-(Δ²isopentenyl) adenosine; iP9G, N⁶-(Δ²isopentenyl)adenine 9-glucoside; iPRMP, N⁶-(Δ²isopentenyl)adenosine 5′-monophosphate. B, content of various forms of cis-zeatin. The legend is the same as in A. C, content of various forms of dihydrozeatin. The legend is the same as in A. D, content of various forms of N⁶-(Δ²isopentenyl)adenine. The legend is the same as in A.