Hyaloperonospora parasitica
Encyclopedia
Hyaloperonospora parasitica is a species from the family Peronosporaceae
. It has been considered for a long time to cause downy mildew of a variety of species within the Brassicaceae
family such as oilseed rape and cauliflower
, on which the disease can cause economically important damage by killing seedlings or affecting the quality of produce intended for freezing.
However, recent phylogenetic research has shown that Hyaloperonospora parasitica is restricted to Capsella bursa-pastoris as host plant. In fact, as a rule Hyaloperonospora species are genetically and biologically quite distant from each other. Each species of Hyaloperonospora is highly specialized and parasitises only few distinct host species or even only a single one.
Accordingly, the former Hyaloperonospora parasitica has been split into a large number of species. For instance, the taxonomically correct name of the parasite of the well-known model organism Arabidopsis thaliana
is Hyaloperonospora arabidopsidis
, not H. parasitica, whereas the pathogen of Brassica
has to be called Hyaloperonospora brassicae
.
Synonyms:
Peronosporaceae
Peronosporaceae are a family of water moulds that contains 17 genera, comprising more than 600 species. Most of them are called downy mildews. The closest relative of Peronosporaceae is Phytophthora....
. It has been considered for a long time to cause downy mildew of a variety of species within the Brassicaceae
Brassicaceae
Brassicaceae, a medium sized and economically important family of flowering plants , are informally known as the mustards, mustard flowers, the crucifers or the cabbage family....
family such as oilseed rape and cauliflower
Cauliflower
Cauliflower is one of several vegetables in the species Brassica oleracea, in the family Brassicaceae. It is an annual plant that reproduces by seed...
, on which the disease can cause economically important damage by killing seedlings or affecting the quality of produce intended for freezing.
However, recent phylogenetic research has shown that Hyaloperonospora parasitica is restricted to Capsella bursa-pastoris as host plant. In fact, as a rule Hyaloperonospora species are genetically and biologically quite distant from each other. Each species of Hyaloperonospora is highly specialized and parasitises only few distinct host species or even only a single one.
Accordingly, the former Hyaloperonospora parasitica has been split into a large number of species. For instance, the taxonomically correct name of the parasite of the well-known model organism Arabidopsis thaliana
Arabidopsis thaliana
Arabidopsis thaliana is a small flowering plant native to Europe, Asia, and northwestern Africa. A spring annual with a relatively short life cycle, arabidopsis is popular as a model organism in plant biology and genetics...
is Hyaloperonospora arabidopsidis
Hyaloperonospora arabidopsidis
Hyaloperonospora arabidopsidis is a species from the family Peronosporaceae. It is an obligate parasite and the causal agent of the downy mildew of the plant model organism Arabidopsis thaliana...
, not H. parasitica, whereas the pathogen of Brassica
Brassica
Brassica is a genus of plants in the mustard family . The members of the genus may be collectively known either as cabbages, or as mustards...
has to be called Hyaloperonospora brassicae
Hyaloperonospora brassicae
Hyaloperonospora brassicae, in the family Peronosporaceae, is a plant pathogen. It causes downy mildew of species of Brassica, Raphanus, Sinapis and probably other genera within the Brassicaceae. In the past, the cause of downy mildew in any plant in the family Brassicaceae was considered to be a...
.
Synonyms:
- Botrytis parasitica Pers., 1796
- ...