摘要:

The amount of gluten protein dispersed by sodium salicylate solution is proportional to the concentration of the salt, while the completeness of extraction with any concentration depends on the penetration of the salicylate solution into the gluten particles. The higher concentrations (5 to 10%) penetrate rapidly because they disperse most of the protein and automatically expose fresh surface for attack. The lower concentrations penetrate slowly unless the non-dispersed protein is occasionally removed by vigorous stirring or shaking. The amount of protein in dispersed form in any specific concentration of salicylate is the same whether determined by extraction or by dilution of a dispersion in 8% salicylate.The amide nitrogen of protein fractions obtained by fractional solubility is the same as that of corresponding fractions obtained by precipitation. Results confirm an earlier conclusion that, except for the most soluble 15%, gluten protein consists of a single complex that can be progressively fractionated.

ISSN:1923-4287    

DOI:10.1139/cjr38c-044

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Samples representing 12 varieties of barley grown at 12 widely separated experimental stations in Canada were malted and subsequently analyzed. Varietal differences were found in steeping rate, malting loss, sprouts, extract, wort nitrogen and diastatic activity.O.A.C. 21 and Mensury, varieties which Canadian maltsters prefer, gave high values for all six properties. Olli, which maltsters consider promising, gave still higher values. Pontiac equalled O.A.C. 21 only in diastatic activity, and the remaining six-rowed, rough-awned variety, Peatland, which has proved less satisfactory, gave lower values for all properties, and this inferiority was more apparent when adjustments were made for its high nitrogen content. In general, the six-rowed, smooth-awned varieties, particularly Regal and Wisconsin 38, gave much lower values. However, Nobarb was only 1% lower in extract than O.A.C. 21, and Velvet equalled the latter in wort nitrogen and diastatic activity. The two-rowed varieties, Charlottetown 80, Hannchen and Victory, were higher in extract but lower in other malt properties than O.A.C. 21. Hannchen, of which considerable quantities are malted in the United States, proved most similar to O.A.C. 21.Amongst theinter-varietalcorrelations between malt properties and nitrogen content or 1000-kernel weight of the barley, only the partial correlations for diastatic activity and 1000-kernel weight, independent of nitrogen, proved significant (r = 0.609). Amongst theinter-stationcorrelations, indicative ofintra-varietalassociations, those for nitrogen and extract (r = −0.957), nitrogen and diastatic activity (r = 0.962), and nitrogen and wort nitrogen (r = 0.764), surpassed the 1% level of significance; whereas those for nitrogen and steeping time (r = −0.637), nitrogen and malting loss (r = 0.694), and 1000-kernel weight and steeping time (r = 0.652), surpassed the 5% level. The inter-station multiple correlation coefficient for steeping time and nitrogen and 1000-kernel weight (R = 0.840) proved highly significant. The corresponding multiple correlation coefficient for extract was not significantly higher than the coefficient of correlation with nitrogen alone.

ISSN:1923-4287    

DOI:10.1139/cjr38c-045

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Various concentrations of indolyl- and naphthylacetic acids were applied to ten varieties of winter wheat prior to planting in a replicated field trial, one-half of each plot receiving seed dusted with Ceresan plus phytohormone, and the other half receiving an equal quantity of seed of the same variety dusted with Ceresan only.Some differences between the hormone-treated and untreated sub-plots in respect of early growth and subsequent density of stand were apparent to visual inspection. There were also statistically significant differences in respect of straw production, and of yield, weight per bushel, and nitrogen content of grain. The effects on grain yield were complicated by the differential response of varieties to the same treatment, and at the higher concentrations some depressions of yield resulted. On the average both chemicals tended slightly to reduce the nitrogen content of the grain produced.The results as a whole seem to demonstrate the physiological activity of both substances tested when applied in this way. Further investigation of dosages, varietal characteristics, and seasonal effects, however, will be required before general conclusions can be reached.

ISSN:1923-4287    

DOI:10.1139/cjr38c-046

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

An apparatus was developed for applying heat treatments to spikes on plants growing in the field. This apparatus gave very satisfactory results on self-fertilized zygotes of Marquis wheat. Treatments at 42, 43, and 44 °C. for 20 min. induced chromosome doubling in 2% of the plants.A wide variety of temperature treatments was applied to more than 13,000 wheat florets 16 to 27 hr. after being pollinated withA.glaucum, in an attempt to produce fertile and stableF1hybrids. Chromosome doubling was induced in oneF1plant of Kharkov ×A.glaucumby exposure to alternating temperatures of 36° and 109° F. The resulting 84-chromosome plant grew slowly and failed to produce any spikes, as was the case with a number of 42-chromosome plants of this cross. Consequently there is uncertainty as to whether this plant is inherently abnormal aside from chromosome doubling, or whether the chromosome number is too high for normal development. It must be concluded from the results as a whole, that chromosome doubling by means of temperature treatments can be induced only with great difficulty inTriticum–A.glaucumhybrids.

ISSN:1923-4287    

DOI:10.1139/cjr38c-047

出版商:NRC Research Press    

年代:1938

数据来源: NRC