FIGURE 3.

Expression of Arabidopsis EXO70C2 in tobacco pollen tubes alters pollen tube growth rate (A) and thickness (B) in dose-dependent manner. Three different DNA amounts (2, 4, and 6 μg) of constructs coding for wild type YFP:AtEXO70C2 or AtEXO70C2:YFP were transiently expressed in Nicotiana tabacum pollen tubes. Pollen tubes expressing YFP:GUS were used as a control. Measurements were performed on at least 40 transformed growing cells per each construct imaged in three independent experiments. Different letters indicate significant differences between samples at P < 0.05.