The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

Abstract

In traditional chlorophytan systems the organizational level was the primary character for the distinction of main groups (classes and orders). For instance, in Fott (1971), the flagellate level corresponds with the Volvocales, the coccoid level with the Chlorococcales, the filamentous level with the Ulotrichales, the siphonocladous level with the Siphonocladales, and the siphonous level with the Bryopsidales. The new system presented here is an elaboration and emendation of recently proposed taxonomies and their underlying phylogenetic hypotheses, and it is mainly based on ultrastructural features which have become available over the last 15 years. The following criteria are used for the distinction of classes and orders: (1) architecture of the flagellate cell (flagellate cells are considered as the depositories of primitive characters); (2) type of mitosis-cytokinesis; (3) place of meiosis in the life history and, consequently, the sexual hfe history type; (4) organizational level and thallus architecture; (5) habitat type (marine versus feshwater and terrestrial); (6) chloroplast type.

Fatty Acids, Hydrocarbons and Terpenes of Nannochloropsis and Nannochloris Isolates with Potential for Biofuel Production

“…Inoculum size of microalgae is another important factor that significantly affects microalgae growth, specifically, the lag phase, maximum specific growth rate, biomass accumulation and the metabolite production at the end of culturing (Richmond 2004). In this study, an inoculum size of 10% v/v, yielded a higher cell density than 20% or 30%, probably because a greater availability of nutrients occurs at lower cell densities [43]. In this regard, inoculum size had an effect on final cell density.…”

Unexpected cryptic species among streptophyte algae most distant to land plants

“…Cell division type phragmoplast-like, presence of advanced cleavage furrow and VII type of mitosis ( sensu van den Hoek et al . [ 33 ]). Sexual reproduction is not observed.…”

“…After settling of the zoospores, the flagella are retracted at the point of their insertion. Cell division type phragmoplast-like, presence of advanced cleavage furrow and VII type of mitosis (sensu van den Hoek et al [33]). Sexual reproduction is not observed.…”

Karyology and nuclear DNA quantification of four species ofChaetomorpha (Cladophorales, Chlorophyta) from the western Atlantic

“…Data from comparative studies of cytology, life history, cytokinesis and cell wall composition have been cited as evidence that the Siphonocladales and Cladophorales should be merged into one order (Hoek, 1981(Hoek, , 1984Hoek et al, 1988), with Cladophorales Haeckel having priority (Papenfuss & Chihara, 1975). In addition, immunological distance estimates suggest that the genus Cladophora is paraphyletic (Olsen-Stojkovich et al, 1986;Hoek et al, 1988) with different species emerging in distant portions of the proposed phylogenetic tree. Such a scheme would seem to require that the unique set of karyological features enumerated above evolved independently following several divergence events.…”