Ultrastructural studies on Nicotiana tabacum pollen tubes grown in different culture medium (preliminary results)

The effects of four different culture media on the growth of the pollen tube of Nicotiana tabacum were investigated. Ultratructural examination revealed that the different media used did not provoke significant morphological differences. Substantial differences were observed in the percentage of generative cell division. Data on the presence of microtubules in the generative and vegetative cells are also reported.