Genetic relationships between resistances to Fusarium head blight and crown rot in bread wheat (Triticum aestivum L.).
Fusarium head blight (FHB) and crown rot (CR) are two wheat diseases caused by the same Fusarium pathogens. Progress towards CR resistance could benefit from FHB-resistant germplasm if the same genes are involved in resistance to these two different diseases. Two independent studies were conducted to investigate the relationship between host resistances to these two diseases. In the first study 32 genotypes were assessed and no significant correlation between their reactions to FHB and CR was detected. The second study was based on a QTL analysis of a doubled haploid population derived from a variety with resistance to both diseases. Results from this study showed that loci conferring resistance to FHB and CR are located on different chromosomes. Together, these results suggest that, despite a common aetiology, different host genes are involved in the resistance against FHB and CR in wheat. Thus, although it is possible that genes affecting both diseases may exist in other germplasm or under different conditions, separate screening seems to be needed in identifying sources of CR resistance.
CSIRO Plant Industry, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia, Brisbane, 4067, Australia.
Hao Bing
HB
Li
Guo Qiang
GQ
Xie
Jun
J
Ma
Gui Ru
GR
Liu
Shu Min
SM
Wen
Tomohiro
T
Ban
Sukumar
S
Chakraborty
Chun Ji
CJ
Liu
D001939:Bread; D002874:Chromosome Mapping; D020090:Chromosome Segregation / Q000235:genetics; D005670:Fusarium / Q000502:physiology*; D005819:Genetic Markers; D005838:Genotype; D006238:Haploidy; D007113:Immunity, Innate / Q000235:genetics*; D010935:Plant Diseases / Q000235:genetics* / Q000276:immunology* / Q000382:microbiology; D040641:Quantitative Trait Loci / Q000235:genetics; D014908:Triticum / Q000033:anatomy & histology / Q000235:genetics* / Q000276:immunology / Q000382:microbiology*
D005819:Genetic Markers