An SEM study of the oospore of some Nitella species (Chlorophyta, Charales) with descriptions of wall ornamentation and an assessment of its taxonomic importance.
by morphological characters, isozyme analysis and oospore wall ornamentation.
Formation and ultrastructure of a complex, multilayered wall around the oospore of Chara and Lamprothamnium (Characeae).
Fossils of obligate aquatic organisms, which include oospores of Characeae, and seeds of Potamogeton, indicate open water in layer V.
The water table continued to rise after that time, indicated by the presence of oospores of Characeae and seeds of Potamogeton and confirmed also by the presence of pollen of Myriophyllum and Potamogeton and non-pollen palynomorphs, such as algal Botryococcus and Pediastrum cf.
For the inoculum, pearl millet leaves containing abundant oospores were collected from diseased 7042(S) and HB 3 plants growing in the downy mildew field nursery at ICRISAT-Patancheru 2 yr prior to the screen.
Here, in the field, inoculum was in the form of soilborne oospores and airborne sporangia, and plants were exposed to inoculum from seedling emergence to grain filling.
For the screen in the UK, oospores were collected from the field 2 yr before inoculum was collected for the screens carried out in India.
At the same time Cristatella mucedo statoblasts appear in the sediment record and the abundance of Characeae oospores
capsici may survive in seed and host plant debris in the soil by means of oospores
Other features indicative of water environment are abundant Characeae oospores, Ranunculus sect.
remains, abundant Characeae oospores (120), remains of limnic animals (Daphnia ephippia, Plumatella statoplasts).