Morphological Characteristics of Pollen from 44 Species of Subgen.Yulania
In order to clarify the morphological characteristics of the pollen and taxonomic relationships of the Subgen.Yulania,the present study observed the morphological characteristics of pollen of 44 Subgen.Yulania(including 8 accessions,36 cultivars)using scanning electron microscopy(SEM).Pollen of all tested materials is single-grained with one grooves and belong to N1P3C3-type pollen grains,prolate or perprolate,with size medium(36.06-42.81)μm ×(16.39-20.07)μm and symmetrical from left to right.Pollen is subglobose in polar view,oval or long oval in equatorial view,and boat-shaped in lateral view.The extine pattern of pollen is relatively primitive and could be broadly divided into six types:hole-shaped,verrucate shaped,stripe-shaped,brain-shaped,short rod-shaped hole shaped and tuberculate.The results showed that the pollen shape and colpae of different Subgen.Yulania were similar,but the exine varied greatly.Therefore,pollen morphology can be used to distinguish different species.However,due to its low resolution,it is difficult to distinguish Yulania species accurately,and it can only be used as an auxiliary reference index for species classification.
Subgen.Yulaniapollen morphologyscanning electron microscopecluster analysis
NETL
NSTL
万方数据
维普
