Sources of resistance and susceptibility to Septoria tritici blotch of wheat.

摘要: An association genetics analysis was conducted to investigate the of resistance Septoria tritici blotch, caused by fungus Zymoseptoria (alternatively Mycosphaerella graminicola), in cultivars and breeding lines wheat (Triticum aestivum) used UK between 1860 2000. The population tested with Diversity Array Technology (DArT) simple-sequence repeat (SSR or microsatellite) markers. formed a single no evidence for subdivision, because there were several common ancestors large parts pedigree. Quantitative trait loci (QTLs) controlling postulated on 11 chromosomes, but 38% variation not explained identified QTLs. Calculation best linear unbiased predictions (BLUPs) lineages spring winter carrying different alleles susceptibility. Abundant may be exploited crossing well-adapted achieve transgressive segregation thus breed potentially durable quantitative resistance, whereas phenotypic selection polygenic should effective increased resistance. most potent allele reducing susceptibility Septoria, chromosome arm 6AL, associated reduced leaf size. Genes which increase have been introduced inadvertently into programmes from yield, rust eyespot 1950s 1980s. This indicates need consider trade-offs plant when numerous traits are important cautious about use non-adapted germplasm.