Abstract: By the methods of fluorochroma(FDA),in vitro,in vivo and nursery stock growing,the pollen quality of the two woody plants, Liridendron chinense and L. tulipifera is examined,and the change in pollen quality was observed during the flowering period.Meanwhile,the pollen germination on the stigma and the growth of pollen tube in the style were investigated under the natural or artificial pollination condition.The results indicate that in vitro condition the pollen germination and pollen tube growth are promoted by the style and ovary tissue obviously.The pollens are affinity,and germinate well on oneself or alien stigma and ovule,however the rate of the pollen tube passing the style is low,only 24%,which is in accordance with our previous study.The results prove again that the developmental phase of the male gametophytes is one of the important factors which influence the seed setting rate,and the style is the region where the inaffinity reaction occurs.

Key words: Liridendron L., Quality of pollen, Pollen tube, Inaffinity