Abstract: Shapes, sizes, germinal apertures and surface sculpture of a new hybrid loquat variety‘Zaozhong 6’and its parents ‘Moriowase’and ‘Jiefangzhong’were observed with the aid of scanning electron microscope and optical microscope in the experiment in order to study their genetic relationship. The observation results were treated and analyzed by scanning probe microscope ( SPM ) picture treating technology. The results showed that the pollens of three loquat variet ies resembled a prolate in shapes, and the number of apertures were 3, which belonged to the colporate type. Pollen's P/ E ratioes of Moriowase, Jiefangzhong and the hybrid were 1. 346, 1. 268 and 1. 193, respectively, their pollen's average axial diameters were 20. 71 µm, 24. 33 µm and 23. 83 µm, respect ively. The pollen characteristics of three variet ies evidently differred in the size and exine sculptures, but which of Zaozhong 6 was between parents, thus, the genetic relationship between the hybrid and its parents were revealed from palynology angle, the new clues were provided for the classification, organization, evolution and genet ic relationship of loquat varieties.

Key words: Loquat, Hybrid, Pollen morphology, Surface sculpture