Everything about Peronosporaceae totally explained
Peronosporaceae are a
family of
water moulds that contains 7
genera, comprising 600
species. Nested within the Peronosporaceae are the
downy mildews and
blue molds.
Peronosporaceae are
obligate biotrophic plant pathogens. They parasitize their host plants using the
haustorial apparatus to penetrate the host's tissues. Most parasitized plants are
dicots. These protists reproduce by releasing entire
sporangia in the same way many species release
spores. The sporangia may be referred to as
conidia.
Peronosporaceae of economic importance include those which have parasitic
mycorrhizal relationships with
grapevines.
Plasmopara viticola causes a form of grape mildew.
Peronospora tabacina, the "blue mold", is a
saprotroph on
tobacco. This species has such a delicate spore that it times its spore release for
sunrise, a time of high ambient moisture and
dew accumulation, so that its spores are less likely to succumb to desiccation and light.
Bremia lactucae is a parasite on
lettuce.
Further Information
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