ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024875

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

摘要:

SUMMARYSynchytrium texanumis a short-cycled parasite ofPlantago rhodospermain Texas which develops large thick-walled resting spores in composite galls. These spores function as prosori in germination and develop superficially attached sori which contain 40 to 500 sporangia. Accordingly,S. texanumis a member of the subgenusPycnochytrimn.Seedlings of 51 species in 47 genera of 33 families were inoculated with suspensions of planospores 4 to 15 times under greenhouse conditions to test the host range ofS. texanum, and of these onlyPlantago virginica, Heliotropium indicum, Pisonia aculeataandXanthium strumariumbecame infected. However, most of the galls and spores on these hosts aborted before attaining maturity.

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024876

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024877

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

摘要:

SummaryA new species ofPseudoarachniotus, P. reticulatus, is described and illustrated. The developmental morphology is discussed and illustrated and the fungus is shown to be homothallic.P. reticulatusis distinguished from the other two species of the genus,P. roseusandP. citrinus, by its globose, reticulate ascospores, the presence of radiating red-capped hyphae among the tufts of asci, as well as by certain color differences.

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024878

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024879

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

摘要:

SUMMARYDothiora schizosporasp. nov. was found on dead stems ofSymphoricarpos orbiculatusMoench. in Missouri. Its most striking specific character is the production of fusoid, phragmosporous or muriform ascospores which are so deeply constricted at the primary septum that they readily separate into halves. The asci are bitunicate. The ascocarp is a parenchymatous, orbicular or oblong ascostroma containing a single, broad, flat locule filled with a continuous palisade of aparaphysate asci which are exposed by the rupture of the overlying stromal tissue and then resemble the disc of an apothecium. The centrum is composed of a parenchymatous tissue which disintegrates as the asci mature. The sexual apparatus consists of globular ascogonia with filamentous trichogynes projecting above the surface of the stroma and microconidia produced in locules in the same or separate stromata. ADothichizaconidial stage is present. The Dothioraceae are classified alongside of the Dothideaceae in the order Dothideales of the subclass Loculoascomycetes.

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024880

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

摘要:

SUMMARYMixed + and - cultures produced 3 to 5 times as much carotene as either isolate produced when grown alone. Increasing the glucose concentration from 20 to 80 g/l more than doubled the carotene yield from mixed + and - cultures; this increase in glucose concentration resulted in an insignificant increase in carotene production when the + and - isolates were grown separately. Hexoses (glucose, mannose, and galactose) were the best carbon sources for carotene production by mixed + and - cultures. Glutamic acid was the best nitrogen source. The lipid content of the mycelium increased as the glucose content of the medium increased; the lipid content was approximately 50 per cent when the medium contained 100 g/1 of glucose. Carotene synthesis continued for several days after the glucose was utilized; the lipid content decreased after the glucose was exhausted. The addition of potassium acetate to 3-day-old cultures grown on the basal medium increased carotene production somewhat. Experiments with acetate-1-C14showed that acetate was utilized.beta-Ionone stimulated carotenogenesis markedly when it was added to half-grown + and - cultures; it was relatively ineffective when added to separate cultures of either isolate. In addition,beta-ionone inhibited growth, decreased the rate of glucose utilization and lipid synthesis, reduced the rate of respiration, and delayed zygospore formation and maturation. Yields of carotene slightly in excess of 7 mg/g dry mycelium were obtained from 4-day-old cultures grown on a molasses-glutamic acid medium and which were treated with 5μl ofbeta-ionone per culture on the second day of incubation.

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024881

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

摘要:

SUMMARYEmploying various reagents to dissolve or to digest portions of the teliospore ofTilletia contraversaKühn in conjunction with histochemical procedures, the morphology of the spore was determined and the parts were separated mechanically. The teliospore wall consists of several distinct layers, incorporating a sheath, a reticulum and a two-layered endospore. The reticulum is cemented to the endospore by a lipoid-containing material.By chemical tests and histochemical techniques, the chemical composition of the various layers was defined in part. The sheath was primarily a pectic material complex, incorporating hemicelluloses (including callose) and lipoids (possibly phospholipid in part). The reticulum contained pectic materials, hemicelluloses (including callose), proteins, melanin pigments and lipoids (possibly phospholipid in part). The material cementing the reticulum to the endospore contained lipoids. Other constituents of the material could not be defined as separate from other layer materials, although chitin was indicated. The outer endospore layer was primarily chitin, but some hemicelluloses (including callose in immature spores and sterile cells) were defined histochemically. The inner endospore layer contained at least chitin, hemicelluloses and pectic materials. Callose and protein were probably present but were not distinct from adjacent structures in the tests employed. The protoplast contained pectic materials, proteins, hemicelluloses (including callose in immature spores and sterile cells) and lipoids (mostly ergosterol).

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024882

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024883

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1960.12024884

出版商:Taylor&Francis    

年代:1960

数据来源: Taylor