摘要:

Ascoconidium tsugaen. sp., a phialosporous hyphomycete from the periderm of western hemlock (Tsuga heterophylla(Raf.) Sarg.) occurs in both the Coastal and Columbia forests, associated with dying branches. The fungus grows slowly on malt agar but does not produce fruiting structures in culture. Evidence of weak pathogenicity is presented.

ISSN:0008-4026    

DOI:10.1139/b66-027

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

Gram-negative, non-spore-forming rods were isolated from dark lesions often found on waxed swede turnips. The bacteria were shown to be pathogenic to turnip tissue and were identified as a strain ofPseudomonas fluorescensMigula 1894, as they differed consistently in various respects from recent detailed descriptions of this species. The pathogen is spread in during the washing of turnips, and lesions form very rapidly after waxing has been completed. Careful attention to hygiene and rapid drying of turnips controls the disease.

ISSN:0008-4026    

DOI:10.1139/b66-028

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

L-Tyrosine was found to be a good precursor of the betacyanin amaranthin inAmaranthussp. Molten Fire. Administration of tyrosine to seedlings increased the pigment content by almost 100% and radioactive tyrosine was found to be incorporated in the pigment. DOPA was not as effective as tyrosine.L-Phenylalanine and a number of other phenyl derivatives without phenolic hydroxyl groups inhibited amaranthin biosynthesis. The system responsible for amaranthin biosynthesis from tyrosine or DOPA requires light, older seedlings requiring more light than younger ones.

ISSN:0008-4026    

DOI:10.1139/b66-029

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

A study was made of the influence of temperature on growth and oxygen uptake bySclerotinia borealisBub. and Vleug. Growth was measured as the increase in diameter of colonies on agar media and oxygen uptake, by conventional manometric procedures with cells removed from shake cultures incubated at 0 °C.The results indicated that the fungus is highly psychrophilic with an optimum temperature for growth at 0 °C, a maximum at approximately 15 °C, and a minimum below −5 °C. Cultures grown at 0 °C ceased to grow when transferred to temperatures above 15 °C but, within limits, resumed growth again after a lag when returned to 0 °C. The length of the lag period was proportional to both the degree and the duration of the temperature elevation.The optimum temperature for oxygen uptake was 25 °C, the rate remaining linear at this temperature during a 6-hour incubation period. The rate at 25 °C declined slowly over a period of 4 days but the rate at 1 °C declined to a similar degree. TheQ10for oxygen uptake was very low, the rate at 25 °C being only double that at 1 °C.

ISSN:0008-4026    

DOI:10.1139/b66-030

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

Blogiascosporan. gen. is described forB. marginata(Fuckel) n. comb. (≡Massaria marginataFuckel) because study of the type revealed that the asci are unitunicate with a pulvillus and amyloid annulus, and that the ascospore walls are pitted. Study of Fuckel's specimens tended to confirm his conclusion thatSeiridium marginatumNees ex Steudel is the conidial state. Von Höhnel's confirmation of this connection was not borne out by a re-examination of his specimens.S. marginatumis redescribed and illustrated from a neotype. These characters are emphasized: the hydrophilic outer layer of the conidiophore, the echinulations arranged in longitudinal ridges on the four central cells of the conidia, and the sequence of septum formation beginning near both ends of the conidia. The taxonomy and nomenclature ofS. marginatumandSeiridiumNees ex Fr. are discussed.

ISSN:0008-4026    

DOI:10.1139/b66-031

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

Two fungi not previously reported from North America,Pseudomassaria sepincolaeformis(De Not.) v. Arx onRosaspp. stems, andNeottiospora caricina(Desm.) v. Höhnel onCarexsp. leaves, were collected in Ontario. Both parasites are redescribed and illustrated from European and Canadian collections. The appendage on conidia ofN. caricinasurrounds the young spore, splits at the apex, evaginates, and remains attached to the spore base.

ISSN:0008-4026    

DOI:10.1139/b66-032

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

In plate culture,Cryptosporiopsissp. inhibited growth of 31 basidiomycetes isolated from decay in coniferous and deciduous trees; an ascomycete, the Dutch elm disease fungus; and a phycomycete, the potato late blight fungus. In liquid malt extract medium,Cryptosporiopsissp. produced a substance highly inhibitory toFomes fomentarius(L. ex Fr.) Kickx, the fungus most commonly associated with decay in living branches of yellow birch,Betula alleghaniensisBritt. Growth ofF. fomentariuswas also inhibited markedly by the presence ofCryptosporiopsissp. in sterile yellow birch wood. In unsterile, peeled logs of balsam fir,Abies balsamea(L.) Mill., the amount of decay was significantly reduced in those treated with an application of a water suspension of mycelial fragments ofCryptosporiopsissp. In unsterile, unpeeled logs there was also less decay in those treated with the mycelial suspension ofCryptosporiopsissp.; however, the difference between the treated and untreated logs was not significant.

ISSN:0008-4026    

DOI:10.1139/b66-033

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

The amoebae ofAcrasis roseagrown on a white mutant ofRhodotorula mucilaginosacontained three colored carotenoids. Two of these were xanthophylls, one being torulene with absorption maxima in hexane at 458, 484, and 518 mμ. The second xanthophyll, the most abundant pigment of the amoebae, was an unknown carotenoid with absorption maxima in hexane at 453, 477, and 508 mμ. A carotene with absorption maxima in hexane at 442, 468, and 500 mμ was also present in small amounts but not identified with any known carotene.It was demonstrated, contrary to a previous report, that the amoebae ofA. roseamultiplied and became pigmented on carotenoid-lacking yeasts such asSaccharomyces cereviseae. On such colorless yeasts, the pigments were qualitatively the same as those isolated whenA. roseawas grown on the colored wild-type and white mutant ofR. mucilaginosa. The synthesis of torulene must then be accomplished, at least in its final stages, by the amoebae ofA. rosea.

ISSN:0008-4026    

DOI:10.1139/b66-034

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

A survey was made of the fungi inhabiting the heartwood of living jack pine (Pinus banksianaLamb.) in Ontario, particularly in stained and decayed wood. Two Basidiomycetes encountered frequently wereFomes pini(Fr.) Karst., associated with red stain and white pocket rot, andPeniophora pseudo-piniWeres. & Gibson, isolated almost exclusively from stained wood.F. piniwas the only fungus consistently associated with white pocket rot, the principal type of heart rot in jack pine. The three most abundant microfungi, a member of theCoryne sarcoidescomplex,Tympanis hypopodiaNyl., andRetinocyclus abietis(Crouan) Groves & Wells, were encountered frequently in stained wood, but less frequently in decayed and normal wood.Many aspects of the occurrence of these five fungi in jack pine were investigated, including their distribution in the stems and branch stubs of individual trees and their association with normal, stained, and decayed wood therein; and the relation between their occurrence and tree growth rate, various heartwood properties, and different stand conditions. The apparent means by which the fungi enter jack pine, and the possible existence of a succession of fungi in the heartwood of living trees, are discussed.

ISSN:0008-4026    

DOI:10.1139/b66-035

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

The effect of potassium deficiency on the metabolism of tomato leaves was studied by the use of14CO2. After normal and potassium-deficient plants had been exposed to14CO2in the light for 5 minutes, the latter showed smaller amounts of label in starch, uridine–diphosphate–glucose, glucose, fructose, glyceric acid, phosphoenol-pyruvate, pyruvic acid, alanine, and aspartic acid. Relatively more was present in 3-phosphoglycerate, serine, glycine, and glutamine. When exposure for 5 minutes to14CO2in the light was followed by 2 hours of darkness, the potassium-deficient plants had less14C in glucose, fructose, alanine, and aspartic acid, but relatively more in sucrose, glycine, and glutamine.Exposure to14CO2in the dark for 2 hours resulted in less label entering aspartic acid, but relatively more in glycine in potassium-deficient plants.The results are consistent with decreased pyruvic kinase activity in potassium-deficient plants, and there is evidence of a similar effect on glyceric acid production, invertase activity, and UDPG synthesis.

ISSN:0008-4026    

DOI:10.1139/b66-036

出版商:NRC Research Press    

年代:1966

数据来源: NRC