Fig. 3.

Pollen dimorphism in M. esculenta genotypes evaluated. (A) Frequency of pollen grains in each category based on the difference in grain diameter for the three genotypes. Note that the normal difference ranges between 5 and 30 µm. A difference of over 30 µm was taken as dimorphic pollen grains. (B) Average number of pollen grains in the different size categories (larger and smaller size as compared with normal size) within the anthers showing pollen dimorphism. Different letters above each column indicate significantly different values at P < 0.05.