10 个农家品种梨花粉形态扫描电镜观察.

Using scanning electron microscopy and optical microscopy system, morphology and exine ornamentation of 10 local pear varieties were observed; Cluster analysis on six quantitative traits was done based on results of pollen morphology observation study. The results showed that: pollen size range of these local pear varieties was from small to medium; Most of local pear varieties were prolate except Fangshanpiao pear and Chinese sand pear and Tapi pear which were perprolate; Every local pear variety belonged to N3P4C5 type which had 3 germinal colporate lasting almost to two ends of the colporat; There were little traces of germinal apertures on base of germinal colporat. The pollen was oblong or elliptic in side view and was trilobate triangle or trilobate circular in polar view; The equatorial view of these local pear varieties were oval and appeared to be cloven; There were striped or retculate exine ornamentation and perforation in the surface. According to the results of cluster analysis, such results were conjectured: Fangshanpiao pear, Hanyuan white pear, bread pear, osmanthus pear and Dayexue pear belonged to Pyrus bretschneideri Rehd, while Tapi pear belonged to Pyrus Brestchneideri Nak. [ABSTRACT FROM AUTHOR]