Fig. 6.

Effects of natural bee buzzes on (A) pollen released by anthers and (B) pollen receipt by stigmas of Huberia bradeana flowers with (purple) and without (green) appendages. (A) Number of pollen grains remaining in anthers before and after the first bee visit (pollen released) NA (not applicable); (B) Counts of stigma load indices after first bee visit (pollen receipt). The stigma load index was estimated by dividing the stigma in three sections. We used the following stigma load indices: 0 = 0%, 1 = 10%, 2 = 25%, 3 = 50% and 4 = 100% for section covered with pollen grains under a microscope (100× objective lens). *P < 0.05, ***P < 0.01.