Fig. 4
From: Screening and optimisation of in vitro pollen germination medium for sweetpotato (Ipomoea batatas)
Comparison of different pollen viability testing methods. (a) I2-KI, bar = 200 μm. (b) TTC, bar = 200 μm. (c) Magenta acetate, bar = 200 μm. (d) FDA, bar = 200 μm. (e, f) In situ germination, bar = 500 μm. (g) In vitro germination, bar = 100 μm. (h) Active pollen rates measured by TTC, Magenta acetate, FDA and in vitro germination. Different letters indicate statistically significant differences (P < 0.001), and error bars represent standard deviations