摘要:

The time of day during which tests are conducted has a pronounced effect on the damage sustained by wheat plants exposed to artificial drought. When the day is divided into four six-hour periods, beginning at 6.00 a.m., the period from 6.00 a.m. to 12.00 noon provides the most severe test. In 12-hr. and 18-hr. exposures, relatively severe damage to the plants is associated with the inclusion: of the 6.00 a.m. to 12.00 noon period.

ISSN:1923-4287    

DOI:10.1139/cjr42c-035

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

Neither the original Mannich–Lenz procedure nor its recently proposed revisions proved suitable for the polarimetric determination of starch in gluten. The principal defect lay in the means of removing or correcting for proteins dissolved along with the starch and there also was a need for improvements in technique of starch dispersion.In the present method, the starch of the gluten sample is dispersed by 15 min. boiling in a calcium chloride solution having a specific gravity of 1.30 and a pH of approximately 2.5. Frothing is controlled by the addition of one or two drops ofn-octyl alcohol, constant volume being maintained during boiling by the addition of water. The proteins dissolved by this treatment are precipitated with 20% stannic chloride prior to filtration and polarization. This rapid procedure underestimates the starch content but the application of a factor to correct for the constant ratio of underestimation allows the real starch content to be determined with an accuracy of ±0.5%.

ISSN:1923-4287    

DOI:10.1139/cjr42c-036

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

Examination of five collections ofPanus stypticus(Bull.) Fries from Europe and of 10 collections from North America has corroborated the findings of other workers that the European form of this fungus is non-luminous and the American form luminous. Series of pairings in all possible combinations of monosporous mycelia from single fruit bodies have shown that both forms are heterothallic and tetrapolar. Pairings between monosporous mycelia of different collections of the American and European forms are fertile. A study of diploid mycelia and fruit bodies of theF1generation from crosses between the luminous and non-luminous forms, and of haploid mycelia from anF1fruit body produced by such a cross, has shown that luminosity in this species is an inherited character, that it is governed by a single pair of Mendelian factors in which luminosity is dominant over non-luminosity, and that the luminosity factors form all possible combinations with the interfertility factors. A point of special interest in the study of the inheritance of this factor is in its expression as a dominant character in the dikaryotic mycelium and fruit bodies of theF1generation.

ISSN:1923-4287    

DOI:10.1139/cjr42c-037

出版商:NRC Research Press    

年代:1942

数据来源: NRC