The inheritance of host plant effect on latency period of wheat leaf rust in spring wheat. I: Estimation of gene action and number of effective factors in F1, F2 and backcross generations

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

• Publisher: Springer
• Year: 1989
• Tongue: English
• Weight: 690 KB
• Volume: 44
• Category: Article
• ISSN: 0014-2336
• DOI: 10.1007/bf00037526

✦ Synopsis

Crosses were made between the highly susceptible Little Club and the partially resistant cultivars Westphal 12A, Akabozu and BH 1146 to obtain F1, F2 and backcross generations . Latency period (LP) was determined in plants inoculated at the young flag leaf stage with a monospore culture of race `Flamingo' of wheat leaf rust . Broad sense heritability of LP in the F2 averaged 0 .8 . The genes showed partial to almost complete recessive inheritance . Scaling tests indicated that additive gene action was the most important factor in the inheritance of partial resistance . The tests showed that there were no indications for additive x additive, additive x dominance or dominance x dominance interactions . The number of effective factors was estimated as one or two for Akabozu, three or more for Westphal 12A, and two or three for BH 1146 . BH 1146 also possessed a (semi-)dominant gene for a lower infection type which was temperature sensitive in its expression . The genes of the various parents had unequal effect on LP .