Phycomycetes

Phycomycetes subclass oomycetes P/asmopara viticola downy mildew of grape... 

Algenpilz, m. algal fungus, phycomycete. Algerien, n. Algeria. 

A mycorrhiza (literally, fungus-root) is a symbiotic association between a fungus and a plant. Mycorrhizae occur most frequently on plant roots, but may be found on any tissue involved in uptake of elements from soil. Mycorrhizae, formed by numerous fungi in the orders Phycomycetes, Basidiomycetes, and Ascomycetes, can be divided into two broad groups those that penetrate host cells (endomycorrhizae) and those that do not (ectomycorrhizae). A few fungal species defy this neat classification, penetrating the cells of one host but not those of another. 

The fungi are classified broadly into the lower fungi, collectively known as Phycomycetes, and the higher fungi, described by the classes Ascomy-cetes, Deuteromycetes and Basidiomycetes. The classification is indistinct some taxonomists argue that the Phycomycetes are not true fungi. 

The Oomycetes, a class within the Phycomycetes, is unusual and regarded by many as being distinct from the true fungi. The taxonomic... 

Chitin is the microfibrillar component of some fungal cell walls and is equivalent to cellulose microfibrils in plants. It is a characteristic feature of the Ascomycetes, Deuteromycetes and Basidiomycetes but is absent in the Phycomycetes, which contain cellulose as their major cell wall constituent. 

Polyoxins are inhibitors of chitin biosynthesis. Chitin is a component of fungal cell walls except in Phycomycete fungi these contain cellulose as their major cell wall constituent, hence polyoxins are inactive against Plasmopara, Pythium and Phytophthora. 

Diokno-Palo, N., Palo, M. A., Cunanan, L. F. and Santos, P. S. 1979. Skim milk-coagulating activities of enzymes produced by phycomycetous fungi. Philippine J. Sci. 108, 137-151. 

Photoautotrophic bacteria 8 Photofootprinting 266 Photorespiration 707 Photosynthesis 506,517, 705 Photosynthetic bacteria 7 Photosynthetic phosphorylation 303, 517 Photosynthetic reaction centers 71 Phthaldialdehyde 120s Phycoerythrin 22 Phycomycetes 20... 

Sirenin, a sperm attractant produced by female gametes of the phycomycete Allomyces... 

Baumert, D. and Buschhaus, H. 1982. Cyprofuram, a new fungicide for the control of Phycomycetes. Meded. Fac. Landbouwwet. Rijksuniv. Gent 47 979-83. 

Schwinn, F.J. 1979. Control of Phycomycetes a changing scene. Proc. Br. Crop Prot. Conf., 10th 3, 791-802. 

As a general conclusion, it can be stated that thus far, all fungi tested, whether belonging to the Phycomycetes, the As-comycetes, or the Basidiomycetes have been found to be susceptible to certain types of tri-substituted organotin compounds. ... 

Metalaxyl is clearly fungicidal i n vitro to a variety of phycomycetous fungi. Its activity in vivo may also be enhanced by stimulation of host plant defenses including hypersensitive cell death (104), accumulation of phytoalexins such as glyceollin (121), and cal lose encasement of hyphae (122) after fungal infection of metalaxy1-treated soybeans. However, the mi vivo concentration of the compound in cell sap may be sufficient for fungitoxicity alone to account for its protective activity (123). 

Rhizopus nigrican (ATCC 6227b) Phycomycetes 1 la-Hydroxylation of steroids, hydroxylation of diteipenes... 

Cunninghamella elegans (NRRL 1393) Phycomycetes Steroid hydroxylation and allylic hydroxylation... 

Phycomycetes, polysaccharides of, 367 Physical properties, of sulfonic esters of carbohydrates, 253... 

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