三个不同品种费约果的花粉-胚珠比及花粉粒形态的扫描电镜观察

Pollen-ovule ratio and scanning electron microscope observation to pollen morphology of Feijoa sellowiana

关键词:  费约果  花粉-胚珠比  花粉粒形态  扫描电镜  分类学

Key words:  Feijoa sellowiana  pollen-ovule ratio  pollen morphology  scanning electron microscope  taxonomy

摘要:

利用扫描电子显微镜对费约果三个品种的花粉粒显微结构形态进行观察,计算三个品种费约果的花粉-胚珠比,并据此分析费约果的形态特征和分类学意义,划分其繁育系统类型。结果表明:‘Coolidge'、‘Mammoth'和‘Unique'三个品种的花粉-胚珠比分别为6±2.37、4.41±1.47和8.52±2.84,其繁育系统为闭花受精型; 费约果花粉粒呈辐射对称,极面观近似等边三角形,有明显的三孔沟(合沟),具角萌发孔,其赤道面观为椭圆形,花粉粒表面具颗粒状雕纹; 三个品种花粉粒形态相比之下也略有差异,但不明显。从费约果与同科4个属花粉粒的对比中可以得出,费约果花粉粒形态结构符合桃金娘科植物的主要特征,其花粉粒形态在分类学上具有重要意义。

Abstract:

P/O of three varieties of Feijoa sellowiana was accounted and breeding systems class was defined; pollens of three varieties of F.sellowiana were observed with scanning electron microscope; and the morphology and taxonomy significance of the pollens were analyzed. The results showed that P/O of ‘Coolidge',‘Mammoth' and ‘Unique'were 6±2.37、4.41±1.47 and 8.52±2.84 and the breeding systems was cleistogamy; Feijoa pollen was radial symmetry; polar view of the pollens was approximately equilateral triangle,with a clear tricolporate(syncolpate)and goniotreme; equatorial view of the pollens appears oval; the surface of the pollens had granulated sculpture. At the same time,the morphology of the three varieties was also slightly different,but not obvious. Compared with other four genus of the same family,the pollen morphology of Feijoa was in accordance with the main features of Myrtaceae plant and had important taxonomy significance.