Sexual reproduction and auxospore development in the diatom Biddulphia biddulphiana.

ABSTRACT: Phylogenetic relationships among mediophycean diatoms with elliptical valve outline and elevated apices have long been a subject of interest and debate, particularly with respect to their relationship to pennates. However, results remain inconclusive, whether based on vegetative valve morphology, reproduction, or molecular phylogenetic data. Searching for phylogenetically informative features, we re-examined sexual reproduction, auxospore structure and development in the diatom Biddulphia biddulphiana. Several unique or unusual features and processes characterized its sexual reproduction. A unique spermatogenesis occurs with premeiotic separation of an anucleate protoplast containing all chloroplasts and likely other organelles. Additionally, their auxospore walls are some of the most comp

SUBMITTER: Kaczmarska I 

PROVIDER: S-EPMC9447881 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature