The inheritance of host plant effect on latency period of wheat leaf rust in spring wheat. II: Number of segregating factors and evidence for trangressive segregation in F3 and F5 generations

✍ Scribed by L. H. M. Broers; Th. Jacobs

• Publisher: Springer
• Year: 1989
• Tongue: English
• Weight: 494 KB
• Volume: 44
• Category: Article
• ISSN: 0014-2336
• DOI: 10.1007/bf00037527

✦ Synopsis

Three partially resistant spring wheat cultivars, with a long latency period were crossed among each other and with the highly susceptible Little Club, with a very short latency period . Parents, F3 and F5 plants have been inoculated with the leaf rust race Flamingo in the young flag leaf stage to determine the latency period .

From the crosses with Little Club, it was concluded that Westphal 12A carries three, Akabozu two and BH 1146 two or three genes for a longer latency period . BH 1146 appears to carry also one hypersensitive resistance gene .

Transgressive segregation occurred in crosses between partially resistant cultivars . From crosses between the partially resistant cultivars, it was concluded that the genes in Akabozu and Westphal 12A are different, while those in Akabozu and BH 1146 are at least partly different . The possibilities of accumulation of LP-prolonging genes are discussed .