向日葵是典型的异花传粉作物。雌蕊柱头对花粉具有选择性。如果能够促使花盘中心的花全部开放,就会使整个花盘的管状花获得充分的授粉机会。 过去的许多试验实质上否定了向日葵自由自花授粉的可能性(不经过人工辅助授粉的自花授粉)。许多试验结果指出:在向日葵中不会出现绝对的异花授粉,即使是在自花不育的种群中也经常有1—5％的植株具有很高的自花授粉可育性。这是因为向日葵象其它菊科植 Sunflower is a typical cross-pollination crop. Pistil stigma is selective for pollen. If you can promote the flower center of the flower is fully open, it will make the entire flower tube tubular flowers to obtain full pollination opportunities. Many past experiments have substantially denied the possibility of free self-pollination of sunflowers (self-pollination without artificial pollination). Many test results indicate that absolute cross-pollination does not occur in sunflowers, and that even 1-5% of the plants in self-sterile populations often have high self-pollination fertility. This is because sunflowers are like other Asteraceae plants