Plasmodiophora brassicae Wor., the clubroot pathogen, is the perfect example of an “atypical” plant pathogen. This soil-borne protist and obligate biotrophic parasite infects the roots of cruciferous crops, inducing galls or clubs that lead to wilting, loss of productivity, and plant death. Un...
The Kingdom Protista contains a plethora of species that vary from the amorphous amoeba to flagellated and ciliated types. Some amoebas have a shell, or test, and are referred to as testate. These tests can be made of silica, calcium carbonate, or organic materials. Some species secrete th...
They are now considered to belong in other kingdoms, such as Protista or Stramenopila. IV.B.6.a. Oomycota: Water Molds and Downy Mildews The Oomycota have been excluded from the kingdom Fungi primarily because their cell walls are made of cellulose rather than chitin. They also have ...
Living organisms fall into one or other of two groups or domains: Prokaryotes or Eukaryotes. Prokaryotes include the bacteria and archaea, while the Domain Eukaryota includes four kingdoms: plants, animals, fungi and the Protista. Amoebas are unicellular organisms characterized by their use of cellul...
The Myxomycota are the true slime molds, also known as the plasmodial slime molds, and are considered members of the kingdom Protista. They exist in nature as a plasmodium—a blob of protoplasm without cell walls and only a cell membrane to keep everything in (Fig. 13). It is really ...
Differ from fungi and plants in lacking a rigid cell wall. Many animals are mobile. After an organism is classified into a kingdom, then each kingdom is divided into phyla (singular, phylum). For example, the animal kingdom is divided into 20–30 different phyla, including Platyhelminthes ...
The organism is not a true fungus and is classed in the kingdom Protista. It is a plant parasite that resides in stagnant water and releases motile zoospores that are attracted not only to plants but also to hair, especially of horses and some breeds of dogs. Skin wounds, if present, ...
It is interesting that OtCPF1 also inhibits the CLOCK/BMAL mediated transcriptional activity of an E box containing promoter in vitro, as previously observed in the diatom Phaeodactylum (Coesel et al., 2009). The relevance of these observations to circadian clock regulation is not, however, ...
Statocysts are gravity-responsive sensory structures that provide information on orientation and movement of an organism and also detect low-frequency vibrations. In mysidaceans, statocysts are located at the base of uropods, but may be present near the base of the first antennae in other ...
These organisms are now placed as heterokonts in the kingdom Stramenopila (or the catch-all dumping-ground kingdom Protista according to some authors). Ecologically many of its members act like fungi, especially the plant pathogens. Phytophthora infestans causes a disease called late blight of...