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Puccinia Monoica
''Puccinia monoica'' is a parasitic rust fungus of the genus '' Puccinia'' that inhibits flowering in its host plant (usually a '' Boechera'' species) and radically transforms host morphology in order to facilitate its own sexual reproduction. History It was originally described and published by American mycologist Charles Horton Peck (1833–1917) as ''Aecidium monoicum'' in Bot. Gaz. 4(11): 230 in 1879. It was found on the leaves of '' Arabis retrofracta'' in Colorado, USA. Then in 1912, mycologist Joseph C. Arthur transferred it to the ''Puccinia'' genus, as ''Puccinia monoica''. Life cycle Infection of host plants (including ''Boechera'' and several other members of the mustard family) occurs via wind-borne basidiospores in late summer. Upon germination of the spores, fungal hyphae penetrate the stem of the mustard plant and siphon off nutrients. However, in order to reproduce sexually, the fungus must facilitate the transfer of spermatia from the spermatogonia on this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Puccinia
''Puccinia'' is a genus of fungi. All species in this genus are obligate plant pathogens and are known as rusts. The genus contains about 4000 species. The genus name of ''Puccinia'' is in honour of Tommaso Puccini (died 1735), who was an Italian doctor and botanist who taught Anatomy at Hospital of Santa Maria Nuova in Florence. The genus was circumscribed by Pier Antonio Micheli in Nov. Pl. Gen. on page 213 in 1729. Taxonomy Examples of ''Puccinia'' rusts and the diseases they cause: * '' Puccinia asparagi'' - Asparagus rust * ''Puccinia graminis'' - Stem rust, also known as black rust * '' Puccinia horiana'' - Chrysanthemum white rust * '' Puccinia mariae-wilsoniae'' - Spring beauty rust * '' Puccinia poarum'' - Coltsfoot rust gall * ''Puccinia psidii'' - Guava rust or eucalyptus rust * '' Puccinia recondita'' - Brown rust * ''Puccinia sessilis'' - Arum rust and Ransoms rust * '' Puccinia striiformis'' - Stripe rust, also known as yellow rust * ''Puccinia triticina'' - Wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petal
Petals are modified Leaf, leaves that surround the reproductive parts of flowers. They are often advertising coloration, brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''corolla''. Petals are usually accompanied by another set of modified leaves called sepals, that collectively form the ''calyx'' and lie just beneath the corolla. The calyx and the corolla together make up the perianth, the non-reproductive portion of a flower. When the petals and sepals of a flower are difficult to distinguish, they are collectively called tepals. Examples of plants in which the term ''tepal'' is appropriate include Genus, genera such as ''Aloe'' and ''Tulipa''. Conversely, genera such as ''Rose, Rosa'' and ''Phaseolus'' have well-distinguished sepals and petals. When the undifferentiated tepals resemble petals, they are referred to as "petaloid", as in petaloid monocots, orders of monocots with brightly colored tepals. Sinc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mimicry
In evolutionary biology, mimicry is an evolved resemblance between an organism and another object, often an organism of another species. Mimicry may evolve between different species, or between individuals of the same species. Often, mimicry functions to protect a species from predators, making it an anti-predator adaptation. Mimicry evolves if a receiver (such as a predator) perceives the similarity between a mimic (the organism that has a resemblance) and a model (the organism it resembles) and as a result changes its behaviour in a way that provides a selective advantage to the mimic. The resemblances that evolve in mimicry can be visual, acoustic, chemical, tactile, or electric, or combinations of these sensory modalities. Mimicry may be to the advantage of both organisms that share a resemblance, in which case it is a form of mutualism; or mimicry can be to the detriment of one, making it parasitic or competitive. The evolutionary convergence between groups is driven by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basidia
A basidium () is a microscopic sporangium (a spore-producing structure) found on the hymenophore of fruiting bodies of basidiomycete fungi which are also called tertiary mycelium, developed from secondary mycelium. Tertiary mycelium is highly-coiled secondary myceliuma dikaryon. The presence of basidia is one of the main characteristic features of the Basidiomycota. A basidium usually bears four sexual spores called basidiospores; occasionally the number may be two or even eight. In a typical basidium, each basidiospore is borne at the tip of a narrow prong or horn called a sterigma (), and is forcibly discharged upon maturity. The word ''basidium'' literally means "little pedestal", from the way in which the basidium supports the spores. However, some biologists suggest that the structure more closely resembles a club. An immature basidium is known as a basidiole. Structure Most basidiomycota have single celled basidia (holobasidia), but in some groups basidia can be multice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telium
Telium, plural telia, are structures produced by rust fungi as part of the reproductive cycle. They are typically yellow or orange drying to brown or black and are exclusively a mechanism for the release of teliospores which are released by wind or water to infect the alternate host in the rust life-cycle. The telial stage provides an overwintering strategy in the life cycle of a parasitic heteroecious fungus by producing teliospores; this occurs on cedar trees. A primary aecial stage is spent parasitizing a separate host plant which is a precursor in the life cycle of heteroecious fungi. Teliospores are released from the telia in the spring. The spores can spread many kilometers through the air, however most are spread near the host plant. Host plants There are a number of plants that can be infected by the telial stage. Therefore, the telial stage is considered a pathogen to those plants. A few specific plant pathogenic species are listed here with their hosts. # ''Puccinia grami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urediniospore
Urediniospores (or uredospores) are thin-walled spores produced by the uredium, a stage in the life-cycle of rusts. Development ''Urediniospores'' develop in the uredium, generally on a leaf's under surface. Morphology *Urediniospores usually have two dikaryote nuclei within one cell. In mass they are usually pale brown in contrast to teliospores which are generally dark brown. See also *Chlamydospore *Urediniomycetes *Pycniospore *Aeciospore *Teliospore *Ustilaginomycetes Ustilaginomycetes is the class of true smut fungi. They are plant parasites with about 1400 recognised species in 70 genera. They have a simple septum with a septal pore cap, this is different from Agaricomycotina which has a dolipore septum with ... * Rust fungus: Spores References *C.J. Alexopolous, Charles W. Mims, M. Blackwell, ''Introductory Mycology, 4th ed.'' (John Wiley and Sons, Hoboken NJ, 2004) Germ cells Fungal morphology and anatomy Mycology {{Basidiomycota-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uredinium
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Stipa
''Stipa'' is a genus of around 300 large perennial hermaphroditic grasses collectively known as feather grass, needle grass, and spear grass. They are placed in the subfamily Pooideae and the tribe Stipeae, which also contains many species formerly assigned to ''Stipa'', which have since been reclassified into new genera. Many species are important forage crops. Several species such as ''Stipa brachytricha'', ''S. arundinacea'', ''S. splendens'', ''S. calamagrostis'', ''S. gigantea'' and ''S. pulchra'' are used as ornamental plants. One former species, esparto grass (''Macrochloa tenacissima''), is used for crafts and extensively in paper making. It is a coarse grass with inrolled leaves and a panicle patterned inflorescence. Ecology Species of the genus ''Stipa'' can occur in grasslands or in savanna habitats. Certain specific prairie plant associations are dominated by grasses of the genus ''Stipa'', which genus often lends its name to the terminology of some prairie types. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trisetum
''Trisetum'' is a genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ... of plants in the grass family, widespread in temperate, subarctic, and alpine habitats in much of the world. Oatgrass is a common name for plants in this genus. Species * Known species are listed in list of ''Trisetum'' species. References Poaceae genera {{Pooideae-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Koeleria
''Koeleria'' is a common and widespread genus of plants in the grass family, found on all continents except Antarctica and on various oceanic islands. It includes species known generally as Junegrasses. The genus was named after German botanist Georg Ludwig Koeler (1765–1807). ;Species *'' Koeleria altaica'' – Siberia, China, Kazakhstan, Mongolia *''Koeleria argentea'' – China, Mongolia, Central Asia, Afghanistan, Pakistan, Himalayas *''Koeleria asiatica'' – Russia, China incl Tibet, Mongolia, Alaska, Yukon, Northwest Territories *''Koeleria askoldensis'' – Primorye region of Russia incl Askold Island *'' Koeleria besseri'' – Europe from the Czech Republic to central European Russia *''Koeleria biebersteinii'' – Crimea *''Koeleria boliviensis'' – Bolivia *''Koeleria brevis'' – Ukraine, Russia, Caucasus, Turkey *'' Koeleria calderonii'' – Argentina ( Mendoza) *''Koeleria capensis'' – Yemen, Africa from Ethiopia + Cameroon to Cape Province *''Koeleria carol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aeciospore
Aeciospores are one of several different types of spores formed by Rusts. They each have two nuclei and are typically seen in chain-like formations in the aecium. References Fungal morphology and anatomy {{mycology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
