摘要:

A distinct strain ofPuccinia Helianthiwas collected on each of the following four species,Helianthus annuus, H.petiolaris, H.tuberosus, andH.subtuberosus. All possible combinations of reciprocal crosses, haploid pustule with haploid pustule, and haploid pustule with diploid pustule, were made among these four strains. Interfertile strains, when crossed, give rise to aecia in the formerly haploid pustules. On this basis, the strains fell into two groups: A, the strains onH.annuusandH.petiolaris, and B, the strains onH.tuberosusandH.subtuberosus. The two strains in each group were highly interfertile; but the two strains of one group were highly intersterile with the two strains of the other group. A parallelism exists between the crossing behavior of certain varieties ofP.graminisand that of these two groups. It is suggested that each of these two groups ofP.Helianthimay represent a variety.

ISSN:1923-4287    

DOI:10.1139/cjr36c-027

出版商:NRC Research Press    

年代:1936

数据来源: NRC

摘要:

Genetic studies were made in theF2andF3generations of the crosses, Selection I-28-60 × Milturum, Reward × Caesium, and Caesium × Marquis. It was found that the character glume color was controlled by either one or two factor pairs in the cross Selection I-28-60 × Milturum, and by two factor pairs in the crosses Reward × Caesium and Caesium × Marquis. The characters, awning, straw color, glume pubescence and spike regularity were each governed by one factor pair, while three factor pairs were operative in the inheritance of seed color.Polymeric factors apparently control the inheritance of the quantitative characters straw strength, plant height, earliness and grain yield. A partial dominance of strong straw and earliness was found in the crosses Reward × Caesium and Caesium × Marquis. Tallness and low grain yield were partially dominant in the cross Reward × Caesium. Evidence for transgressive segregation of earliness was obtained in the cross between Caesium and Marquis.The characters glume color, awning, straw color, glume pubescence and spike regularity were inherited independently. White straw color and earliness were definitely associated in the crosses Reward × Caesium and Caesium × Marquis. The characters straw color and plant height were loosely linked in the Caesium × Marquis cross. Grain yield was not significantly correlated with straw strength, plant height or earliness in the cross between Reward and Caesium. Small but significant relationships were found among the characters straw strength, plant height and earliness in the crosses Reward × Caesium and Caesium × Marquis. The relation between heading and maturity was studied only in theF4of Reward × Caesium, in which case a strong positive correlation was obtained.

ISSN:1923-4287    

DOI:10.1139/cjr36c-028

出版商:NRC Research Press    

年代:1936

数据来源: NRC