摘要:

Eighty-two strains ofBacillus polymyxagrew in a medium consisting of inorganic salts, glucose, and casein hydrolysate only when biotin was added, hence this growth factor may be considered essential. Thiamin stimulated growth of some strains but inhibited others whereas pantothenic acid, nicotinic acid, riboflavin, pyridoxine, and inositol were without effect. Casein hydrolysate was replaceable by urea, ammonium sulphate, and a mixture of 18 amino hydrolysed acids, but with a few exceptions these substances were not as effective as the protein. Potassium nitrate and asparagine were poor sources of nitrogen. Yeast extract, in a medium containing only glucose and inorganic salts, was superior to all other substances tested in its stimulatory effect onB.polymyxa.

ISSN:1923-4287    

DOI:10.1139/cjr44c-022

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

Approximately neutral sodium salt solutions of the group of chemicals comprising synthetic plant growth stimulants have been found to disperse undenatured gluten. Marked dispersing effects were noted with salts of naphthylacetic, naphthylbutyric, naphthylhexoic, indolylacetic, indolylbutyric, and phenylacetic acids. Salts of other substances, i.e., anthranilic and sulphanilic acids also had some effect. Percentages of nitrogen in gluten dispersed by salts of the following acids were 97 for naphthylacetic, 86 for phenylacetic, 85 for anthranilic, and 67 for sulphanilic; the controls, 1% sodium hydroxide and 10% sodium salicylate effected dispersions of 94 and 96% of total nitrogen, respectively.

ISSN:1923-4287    

DOI:10.1139/cjr44c-023

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

A study of the identity and prevalence ofFusariumspecies, isolated from 1448 farm samples of seed of common wheat, 262 of durum wheat, 865 of barley, and 519 of oats produced in Manitoba, was carried on during the six years 1937 to 1942. A total of 16 species, varieties, or forms ofFusarium, representing seven sections of the genus were isolated and identified.Fusarium Poae(Pk.) Wr.,F.Equiseti(Cda.) Sacc., andF.ScirpiLamb & Fautr. var.acuminatum(Ell. & Ev.) Wr. were the predominant species isolated.Fusariumspecies, one or more, were isolated from approximately 39% of the samples of common wheat, 38% of durum wheat, 55% of barley, and 59% of the samples of oats. The individual species ofFusariumwere isolated from less than 1% of the seeds of the four crops, with the exception ofF.Poae, which was isolated from 1.79% of the seeds of oats.Fusariumspecies, one or more, were isolated from approximately 0.66% of the seeds of common wheat, 0.50% of durum wheat, 1.23% of barley, and 2.21% of the seeds of oats.

ISSN:1923-4287    

DOI:10.1139/cjr44c-024

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

The reactions of five varieties of oats in the seedling and adult plant stages to seven physiologic races of crown rust,Puccinia coronataCorda var.AvenaeErikss. & Henn. were determined.All five varieties were completely susceptible in the seedling stage to all the races. Two varieties, Erban and Ajax, were resistant in the adult plant stage to some of the races and susceptible or moderately susceptible to others. Two other varieties, R.L. No. 1370 and R.L. No. 1510 were resistant in the adult plant stage to all the races used in this test, and apparently possess a generalized type of adult plant resistance to crown rust.

ISSN:1923-4287    

DOI:10.1139/cjr44c-025

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

Celery grown in muck soil near Thedford, Ont., is subject to a storage rot caused by a fungus,Ansatospora macrospora(Osterw.) Newhall. A 10-year investigation has shown that damage varies from nothing to complete destruction of the stored celery. Losses are usually small during the first two months of storage; they increase with time and may be complete in four months. Most of the losses are caused by lesions that develop in the celery butts.The work reported followed two major courses: the life history of the organism and practical control of the disease. The latter was obtained by dipping the trimmed butts of celery at harvest in a watery mixture of phenylmercuric acetate.

ISSN:1923-4287    

DOI:10.1139/cjr44c-026

出版商:NRC Research Press    

年代:1944

数据来源: NRC