Nematospora coryli
Encyclopedia
Nematospora coryli is a plant pathogen that causes stigmatomycosis
. It is cultivated on potato
dextrose agar
and grows as yeast
-like oval or spherical budding
cells either isolated or in short chains and has few hyphae which are septate
at maturity. In addition to buds, the yeast produces many asci
(or sporiferous sacs or sporangia
) that are cylindrical to naviculate, with two to eight needle-like ascospores arranged lengthwise. Ascospores are apiculate to fusiform, with a distinct septum
at or near the center and the upper cell slightly broader at the septum, and after liberation are held together in a mass by long appendage
s. N. coryli colonies are creamy and perfectly round. The yeast grows at 10 - 37 °C, with an optimum range of 30 - 35 °C. More asci form at 15 - 20 °C than 25 - 35 °C.
Stigmatomycosis
The term Stigmatomycosis is the general name for a fungal disease that occurs in a number of crops, such as cotton, soybean, pecan, pomegranate, citrus, and pistachio. It has been reported on pistachio in Greece, Iran, Russia, and is frequently a problem in California pistachio orchards severely...
. It is cultivated on potato
Potato
The potato is a starchy, tuberous crop from the perennial Solanum tuberosum of the Solanaceae family . The word potato may refer to the plant itself as well as the edible tuber. In the region of the Andes, there are some other closely related cultivated potato species...
dextrose agar
Agar
Agar or agar-agar is a gelatinous substance derived from a polysaccharide that accumulates in the cell walls of agarophyte red algae. Throughout history into modern times, agar has been chiefly used as an ingredient in desserts throughout Asia and also as a solid substrate to contain culture medium...
and grows as yeast
Yeast
Yeasts are eukaryotic micro-organisms classified in the kingdom Fungi, with 1,500 species currently described estimated to be only 1% of all fungal species. Most reproduce asexually by mitosis, and many do so by an asymmetric division process called budding...
-like oval or spherical budding
Budding
Budding is a form of asexual reproduction in which a new organism grows on another one. The new organism remains attached as it grows, separating from the parent organism only when it is mature. Since the reproduction is asexual, the newly created organism is a clone and is genetically identical...
cells either isolated or in short chains and has few hyphae which are septate
Septate
Septate 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...
at maturity. In addition to buds, the yeast produces many asci
Ascus
An ascus is the sexual spore-bearing cell produced in ascomycete fungi. On average, asci normally contain eight ascospores, produced by a meiotic cell division followed, in most species, by a mitotic cell division. However, asci in some genera or species can number one , two, four, or multiples...
(or sporiferous sacs or sporangia
Sporangium
A sporangium is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. All plants, fungi, and many other lineages form sporangia at some point in their life cycle...
) that are cylindrical to naviculate, with two to eight needle-like ascospores arranged lengthwise. Ascospores are apiculate to fusiform, with a distinct septum
Septum
In anatomy, a septum is a wall, dividing a cavity or structure into smaller ones.-In human anatomy:...
at or near the center and the upper cell slightly broader at the septum, and after liberation are held together in a mass by long appendage
Appendage
In invertebrate biology, an appendage is an external body part, or natural prolongation, that protrudes from an organism's body . It is a general term that covers any of the homologous body parts that may extend from a body segment...
s. N. coryli colonies are creamy and perfectly round. The yeast grows at 10 - 37 °C, with an optimum range of 30 - 35 °C. More asci form at 15 - 20 °C than 25 - 35 °C.