Urediniospore
Encyclopedia
Urediniospores are the thinner-walled spore
s of some fungi: (rusts
and smuts
), from which the basidium
arises.
Spore
In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form part of the life cycles of many bacteria, plants, algae, fungi and some protozoa. According to scientist Dr...
s of some fungi: (rusts
Rust (fungus)
Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales. About 7800 species are known. Rusts can affect a variety of plants; leaves, stems, fruits and seeds. Rust is most commonly seen as coloured powder, composed off tiny aeciospores which land on vegetation producing...
and smuts
Smut (fungus)
The smuts are multicellular fungi, that are characterized by their large numbers of teliospores. The smuts get their name from a Germanic word for dirt because of their dark, thick-walled and dust-like teliospores. They are mostly Ustilaginomycetes and can cause plant disease...
), from which the basidium
Basidium
thumb|right|500px|Schematic showing a basidiomycete mushroom, gill structure, and spore-bearing basidia on the gill margins.A basidium is a microscopic, spore-producing structure found on the hymenophore of fruiting bodies of basidiomycete fungi. The presence of basidia is one of the main...
arises.
Morphology
- Urediniospores are usually consist of two dikaryoteDikaryonDikaryon is from Greek, di meaning 2 and karyon meaning nut, referring to the cell nucleus.The dikaryon is a nuclear feature which is unique to some fungi, in which after plasmogamy the two compatible nuclei of two cells pair off and cohabit without karyogamy within the cells of the hyphae,...
nuclei within one constricted cell resembling the number 8 without a septationSeptateSeptate is a morphological term used in biology in two different instances.*In human biology, it is used to describe a divided uterus.*In mycology, it is used to describe the condition of spores or hyphae in terms of having or lacking a septa to divide...
. As the spores germinate, the nucleiCell nucleusIn cell biology, the nucleus is a membrane-enclosed organelle found in eukaryotic cells. It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these...
undergo karyogamyKaryogamyKaryogamy is the fusion of pronuclei of two cells, as part of syngamy, fertilization, or true bacterial conjugation.It is one of the two major modes of reproduction in fungi...
and thereafter meiosisMeiosisMeiosis is a special type of cell division necessary for sexual reproduction. The cells produced by meiosis are gametes or spores. The animals' gametes are called sperm and egg cells....
, giving rise to four-celled basidia with haploid basidiosporeBasidiosporeA basidiospore is a reproductive spore produced by Basidiomycete fungi. Basidiospores typically each contain one haploid nucleus that is the product of meiosis, and they are produced by specialized fungal cells called basidia. In grills under a cap of one common species in the phylum of...
s.
- They don't have a thick-capped telia as compared to teliosporeTeliosporeTeliospore is the thick-walled resting spore of some fungi , from which the basidium arises.-Development:They develop in telia ....
s.
- Looks like a balloon pinched in the middle, (like an 8 without septationSeptationSeptation may refer to:*Cell division*Formation of the septum during heart development...
)
See also
- ChlamydosporeChlamydosporeA Chlamydospore is the thick-walled big resting spore of several kinds of fungi. It is the life-stage which survives in unfavourable conditions, such as dry or hot seasons....
- Urediniomycetes
- TeliosporeTeliosporeTeliospore is the thick-walled resting spore of some fungi , from which the basidium arises.-Development:They develop in telia ....
- UstilaginomycetesUstilaginomycetesUstilaginomycetes is the class of true smut fungi. They are plant parasites with about 1400 recognised species in 70 genera....