摘要:

The protein of O.A.C. 21 barley and of the malt produced from it were fractionated by means of various solvents and the fractions were analyzed. The results of the solubility studies and of the analyses support the use of 5% potassium sulphate for the quantitative separation of the albumin and globulin from the less soluble proteins. Fractions of the protein undissolved by potassium sulphate solution decreased in amide nitrogen and increased in arginine nitrogen with decreasing solubility. The results suggest that the protein is a complex, only part of which is soluble in 70% alcohol, and that the selection of this solution for separating it into two fractions is entirely arbitrary.The grains of barley and malt were separated into hulls, germs and "kernels." The total weight and nitrogen content of these fractions, and the distribution of the proteins amongst them was determined. Malting causes no appreciable changes in the hulls. In the "kernel" there is a general breaking down of protein to simpler forms. In the acrospire there is an increase in non-protein nitrogen, salt-soluble protein and glutelin, but no appreciable increase in hordein. The glutelin of the acrospire differs from that of the malt "kernel" both in amide- and argenine-nitrogen content and must be regarded as a distinct protein.

ISSN:1923-4287    

DOI:10.1139/cjr36c-009

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

A Chytrideaceous parasite apparently not hitherto described has been found on the roots of wheat seedlings grown in soil from Ottawa, Ontario; and Boston, Massachusetts. The fungus is closely related to the uniporous Rhizophidiums but since it does not appear to be identical with any of these morphologically and exhibits a type of sexuality not previously described in this genus it is considered to be a new species. The nameRhizophidium graminisis proposed.

ISSN:1923-4287    

DOI:10.1139/cjr36c-010

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

The results of a number of preliminary investigations regarding the nature of drought resistance in wheat are presented.A study of the susceptibility of wheat plants to drought at different stages of development showed that the shooting and the soft-dough periods were the most critical, from the point of view of grain yield. Heavy foliage losses occurred when plants were exposed during the shooting period, and recovery was very slow. Exposure of plants during the stooling stage resulted generally in transient injury, as the capacity for recovery was particularly great at this time. Plants subjected to drought during the hard-dough stage sacrificed little in kernel plumpness.Hardening of wheat plants by soil drought, or by limited exposures to atmospheric drought, increased their resistance to exposures of severe atmospheric drought.The drought-resistant varieties Milturum and Caesium were found to possess a more highly branched primary root system than the non-resistant varieties Marquis and Reward. The durum varieties, Pentad and Pelissier, were found to excel in numbers of primary roots produced, having an average of five per plant. Milturum, Caesium and Baart had more than four primary roots per plant on the average; while Canus, Federation, Reward, Marquis, Garnet and Red Bobs No. 222 had from 3.2 to 3.6. Reliance wheat and wild oats had not more than three primary roots per plant.The addition of superphosphate to the soil resulted in a slight decrease in number of primary roots of Milturum, Caesium and Marquis, and a slight increase in the number of Reward.The kernels of the drought-resistant varieties, Milturum and Caesium, did not show any marked superiority to those of Marquis, Reward, Garnet and Red Bobs No. 222, in capacity to germinate in the more concentrated solutions of sodium chloride, potassium chloride and sucrose. A higher energy of germination was displayed by the kernels of Milturum, Caesium and Garnet than by those of the other three varieties tested.Milturum and Canus exhibited high resistance to injury from windburn when tested m the late stooling to early shooting growth stages. The durum varieties Pentad and Kubanka and the soft wheat, Baart, on the other hand, showed high susceptibility. The soft wheat, Federation, and the variety Red Bobs No. 222 were moderately susceptible.

ISSN:1923-4287    

DOI:10.1139/cjr36c-011

出版商:NRC Research Press    

年代:1936

数据来源: NRC