Rhizopus

Last updated

Rhizopus
Structure of Rhizopus spp.-english.JPG
Schematic diagram of Rhizopus spp.
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Fungi
Division: Mucoromycota
Class: Mucoromycetes
Order: Mucorales
Family: Mucoraceae
Genus: Rhizopus
Ehrenb. (1820)
Type species
Rhizopus nigricans
Ehrenb. (1820)
Synonyms [1]

Rhizopus is a genus of common saprophytic fungi on plants and specialized parasites on animals. They are found in a wide variety of organic substances, including "mature fruits and vegetables", [2] jellies, syrups, leather, bread, peanuts, and tobacco. They are multicellular. Some Rhizopus species are opportunistic human pathogens that often cause fatal disease called mucormycosis. This widespread genus includes at least eight species. [3] [4]

Contents

Rhizopus 400x magnification Rhizopus fungus.jpg
Rhizopus 400x magnification

Rhizopus species grow as filamentous, branching hyphae that generally lack cross-walls (i.e., they are coenocytic). They reproduce by forming asexual and sexual spores. In asexual reproduction, spores are produced inside a spherical structure, the sporangium. Sporangia are supported by a large apophysate columella atop a long stalk, the sporangiophore. Sporangiophores arise among distinctive, root-like rhizoids. In sexual reproduction, a dark zygospore is produced at the point where two compatible mycelia fuse. Upon germination, a zygospore produces colonies that are genetically different from either parent.

Various species, including R. stolonifer, may cause soft rot in sweet potatoes and Narcissus.

Rhizopus helps in nutrient development since this species is grown in soil it ferments the fruits and vegetable in the soil inhibiting the growth and develops certain pathogens that inhibits the growth of toxigenic fungus. [5] In addition to that, there is even a type of Rhizopus (Rhizopus microsporus-fermented soybean tempe) that has proven to reduce colon carcinogenesis in rats by elevating factors of mucins, immunoglobulin A, and organic acids and give protection to piglets from Escherichia coli-infection by inhibiting adhesion to the intestinal membranes. [6]

Phylogeny

Rhizopus oryzae has heterothallic mating with a + and a - mating type [7] . Rhizopus species have large genomes with evidence of full genome duplication [8] .

Species

See also

References

  1. "Rhizopus Ehrenb. 1820". MycoBank. International Mycological Association. Retrieved 2011-02-05.
  2. Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CABI. p.  599. ISBN   978-0-85199-826-8.
  3. Zheng RY, Chen GQ, Huang H, Liu XY (2007). "A monograph of Rhizopus". Sydowia . 59 (2): 273–372.
  4. Abe A, Asano K, Sone T (2010). "A Molecular Phylogeny-Based Taxonomy of the Genus Rhizopus". Bioscience, Biotechnology, and Biochemistry . 74 (7): 1325–1331. doi: 10.1271/bbb.90718 . PMID   20622457. S2CID   13369408.
  5. Dwi Endrawati, Dwi Endrawati. "Several Functions of Rhizopus sp on Increasing Nutritional Value of Feed Ingredient". June 2017.
  6. Yang, Yongshou (2018). "The effects of tempe fermented with Rhizopus microsporus, Rhizopus oryzae, or Rhizopus stolonifer on the colonic luminal environment in rats" . Journal of Functional Foods. 49: 162–167. doi:10.1016/j.jff.2018.08.017. S2CID   91791814.
  7. Gryganskyi, Andrii P.; Lee, Soo Chan; Litvintseva, Anastasia P.; Smith, Matthew E.; Bonito, Gregory; Porter, Teresita M.; Anishchenko, Iryna M.; Heitman, Joseph; Vilgalys, Rytas (2010-12-09). "Structure, Function, and Phylogeny of the Mating Locus in the Rhizopus oryzae Complex". PLOS ONE. 5 (12): e15273. Bibcode:2010PLoSO...515273G. doi: 10.1371/journal.pone.0015273 . ISSN   1932-6203. PMC   3000332 . PMID   21151560.
  8. Ma, Li-Jun; Ibrahim, Ashraf S.; Skory, Christopher; Grabherr, Manfred G.; Burger, Gertraud; Butler, Margi; Elias, Marek; Idnurm, Alexander; Lang, B. Franz; Sone, Teruo; Abe, Ayumi; Calvo, Sarah E.; Corrochano, Luis M.; Engels, Reinhard; Fu, Jianmin (2009-07-03). "Genomic Analysis of the Basal Lineage Fungus Rhizopus oryzae Reveals a Whole-Genome Duplication". PLOS Genetics. 5 (7): e1000549. doi: 10.1371/journal.pgen.1000549 . ISSN   1553-7404. PMC   2699053 . PMID   19578406.