3.2 Fruit and seed characteristics
Self-pollination (Figure 2A) and nectar addition (Figure 2B) resulted in more shriveled seeds compared with cross-pollination (Figure 2C) and natural conditions (Figure 2D). The proportion of shriveled seeds after self-pollination and nectar addition was significantly higher than after cross-pollination and natural conditions (all p < 0.01) (Table 1). There were significant differences in the proportion of shriveled seeds between self-pollination and artificial nectar addition (p < 0.01) (Table 1), but not between cross-pollination and natural conditions (p = 0.703 > 0.05).
There was no significant difference in fruit length and seed number per fruit among the four treatments (all p>0.05) (Table 1). Fruit weight and seed weight per fruit of self-pollination and nectar addition was significantly lower than that of cross-pollination and natural conditions (all p < 0.01) (Table 1). There were no significant differences in fruit weight and seed weight per fruit between cross-pollination and natural conditions (p > 0.05), and between self-pollination and artificial nectar addition (p > 0.05) (Table 1). Though fruit width after self-pollination was significantly lower than natural conditions (p <0.05), there was no significant difference in fruit width after cross-pollination, artificial nectar addition and natural conditions (all p > 0.05) (Table 1).