RESUMO
The green algae and the charophytes represent the most widely studied groups of algae in respect to their ploidy levels. In some genera increased size accompanies ploidy level changes as well as certain morphological modifications, but in other genera no evident obvious changes can be discerned. In the other major groups of algae, namely the Rhodophycophyta and Phaeophycophyta, few cases of polyploidy have been documented adequately. In the remaining groups, unusual nuclear phenomena and/or behavior have hampered studies and few species have adequately been studied in regard to their polidy levels.
Assuntos
Eucariotos/genética , Poliploidia , Eucariotos/classificaçãoRESUMO
Eight chlorococcalean algae and 5 rhodophycean algae have been grown in axenic cultures. These organisms have been "fingerprinted" using a pyrolysis-gas-liquid chromatographic analysis. Each alga has a distinctive pyrogram which characterizes it both quantitatively and qualitatively. The pyrograms are given and the significance for possible future uses of this technique in developmental, evolutionary, and systematic studies with algae is discussed.
RESUMO
Erythrocladia subintegra has been cultured for over 3 years. The life history includes reproduction by monospores, a long period of ameboid motility by monospores, their germination and growth into monostromatic disk-shaped plantlets composed of adherent, often dichotomously branched filaments. Plants become centrally polystromatic with age and produce monospores. Variations in plant size and shape, cell size and shape, spore size, shape, and motility are discussed. Variations in plants of E. subintegra grown on different substrates have been studied and discussed in relation to other species in the genus.
