Figure 6

Scanning electron micrographs of anthers and pollen grains. (a) Anther of L. gibba 5504 showing the closed slit. (b) Anther of L. gibba 7741 with opened slit. (c) Pollen grain of clone 5504 showing pineapple-like exine and tilted spines. (d) Pollen grain of clone 7741 showing the smooth exine and uniformly distributed spines.