The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Pycnidiospores

a spore formed in the pycnidia of certain imperfect fungi; it results in asexual sporogenesis of mycobiontic fungi of lichens. Pycnidiospores vary in shape and coloration and consist of single or multiple cells. They have longitudinal or transverse membranes; appendages may be present or absent. Pycnidiospores form on growths on the basal layer of the pycnidium covering (on the conidium stem). They may result from the disintegration of the contents of pycnidia into separate cells.

Mentioned in

References in periodicals archive

In anamorph, pear-shaped pycnidia contain unicellular or bicellular pycnidiospores (6-23 um) produced upon conidiophores (Punithalingam and Holliday, 1972; Nene, 1982).

GENETIC RESISTANCE IN CHICKPEA AGAINST ASCOCHYTA BLIGHT: HISTORICAL EFFORTS AND RECENT ACCOMPLISHMENTS

These effects are attributable to repeated cycles of the asexual stage of the fungus, in which pycnidia give rise to splash-dispersed pycnidiospores which eventually infect the upper leaves on whose photosynthetic activity crop yield is dependent.

Different studies [5, 9] have confirmed that during spring and the beginning of summer the severity of the epidemic was conditioned by pycnidiospores produced in the crop; nevertheless, ascospores were present since the first basal leaves were infected [9, 10].

Different studies [5, 15, 16] have confirmed that, during spring and the beginning of summer, the severity of an epidemic for this pathogen is conditioned by the number of pycnidiospores produced in the crop; nevertheless, ascospores are present from the time that the first basal leaves are infected [17].

Weather Conditions Associated with the Release and Dispersal of Zymoseptoria tritici Spores in the Argentine Pampas Region

In general, small quantities of pycnidiospores were produced.

Registration of 10 Wheat Germplasms Resistant to Septoria tritici Leaf Blotch

Leptosphaeria maculans is grown at 25[degrees]C on V-8 agar plates, and pycnidiospores are collected in distilled water from the surface of 7-d-old plates (Tuite 1969).

Evolution of pest-induced defenses in Brassica plants: tests of theory

maculans pycnidiospores [ml.sup.-1], which was placed on the wound site.

Costs of disease resistance to three fungal pathogens

908 transformants were obtained from germinated pycnidiospores on a selection medium which contained hygromycin.

DEVELOPMENT OF EFFICIENT REGENERATION AND GENETIC TRANSFORMATION SYSTEMS IN LOCAL CULTIVARS OF CHICKPEA (Cicer arietinum L.)