Title: Hybrid necrosis as a problem in handling hexaploid × tetraploid wheat crosses
Abstract:Summary A tetraploid wheat breeding programme was initiated at the Plant Breeding Institute in 1970. Hexaploid × tetraploid wheat crosses were expected to contribute to the improvement of the tetraplo...Summary A tetraploid wheat breeding programme was initiated at the Plant Breeding Institute in 1970. Hexaploid × tetraploid wheat crosses were expected to contribute to the improvement of the tetraploid wheats but severe hybrid necrosis caused the death of the pentaploid Fx hybrid plants in most crosses. The genotypes of tetraploid wheat selections derived from crosses involving Rampton Rivet, a non-carrier of Neu were determined by test crossing to hexaploid wheat varieties which were known to carry the Nei m allele. Similarly, hexaploid wheat selections which did not carry Ne 2 were identified from crosses involving Maris Ranger by test crossing to durum selections which carried the Nef allele. By the careful choice of one parent, hexaploid x tetraploid wheat crosses were then made which avoided the hybrid necrosis problem. Segregation of the Ne% gene was as expected but selection for agronomic characters appeared to favour the retention of the dominant allele of the Ne1 gene. Nevertheless, test crossing on a relatively small scale still identified many non-carriers.Read More
Publication Year: 1980
Publication Date: 1980-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 10
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