Morphological study on anther development of male sterile of Platycodon grandiflorum

The comparative study on anther's morphology and anatomy characteristics in Platycodon grandiflorum was carried out between male sterile and male fertility varieties by farming observation and paraffin section method. The results showed that male fertility had no obvious differences with male sterile in morphology and anther's length of flower,but after flowering,male fertility had full and lustrous anthers with pollen granule spilled out,male sterile had shiriveled and lacklustre anthers with empty pollen.Tapetum layer of male sterile was degenerated and disappeared before fertility,leading to the degradation and finally abnormal development of the microspores.