为了使不同开花期的果树或是地域相距甚远的果树相互授粉杂交,从而得到理想性状的果实,日本科学家多年来从事果树花粉采集和保存的研究。近年来,由于他们使用液氮超低温贮藏和干冻等技术,使果树花粉能长期保存。据报道,梨和桃的花粉经干冻后,在-20℃的条件下,可以保存10年。 In order to fruit trees at different flowering stages or far apart from each other, pollination and hybridization to obtain the desired traits of fruit, Japanese scientists for many years engaged in fruit pollen collection and preservation studies. In recent years, due to their use of liquid nitrogen cryogenic storage and drying technology, pollen can long-term preservation of fruit trees. It is reported that pears and peaches after the pollen is dried, at -20 ℃ under the conditions, can be stored for 10 years.