Location of genes for resistance to Puccinia hordei otth. in the barley varieties Sudan and Reka 1 as determined by means of translocation stocks

The objective of this investigation was to assign the genes for resistance to leaf rust Puccinia hordei Otth. race 4 in two varieties of barley to the correct chromosome pair by means of crossing with nine translocation stocks. The varieties Sudan (C.I.6489) and Reka 1 (C.I.5051) were crossed with the following translocation stocks: 5051-2 (a-b), 5059-5 (a-e), 5030-2 (b-d), 5034-2 (b-f), 5062-3 (b-g), 5038-2 (c-d), 5056-2 (c-e), 5053-6 (e-f), and 5057-1 (f-g). The F₁ plants from crosses of Sudan with all translocations and Reka with all translocations were tested for rust reaction and found to be resistant. Examination of the mature pollen showed that the F₁’s were partially sterile. In the crosses involving the variety Sudan with translocation stocks having interchanges of chromosomes a with e and c with e, the F₂ data indicated complete linkage. The common chromosome e must carry the gene for resistance. This is substantiated by crosses involving translocations of a with other chromosomes and c with others, which showed independent assortment. In the crosses involving the variety Reka with translocation stocks having interchanges of chromosomes b with f and e with f, the F₂ data indicate that in Reka, the gene for resistance is linked with chromosome f. This is substantiated by crosses involving translocations of b with other chromosomes and e with others, which showed independent assortment. The results obtained from the F₂ data of the crosses studied indicated that in the varieties Sudan and Reka reaction to leaf rust is conditioned by genes that are independent of each other.

Name thesis:degree_name

Ph. D.

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Genetics

Department dc:contributor.department

Genetics

Grantor dc:publisher

Virginia Polytechnic Institute

Year dc:date.issued

1961

Author dc:creator

• Alamuddeen, Mohammed Adnan

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/10919/76549

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/76549