Identification Of QTLs for Powdery Mildew and Scald Resistance in Barley

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Journal Title, Volume, Page: 
Euphytica:151:421–429
Year of Publication: 
2006
Authors: 
M. J. Y. Shtaya
Faculty of Agriculture, An-Najah N. University, P.O. Box 707, Nablus, Palestinian Territory
Preferred Abstract (Original): 

A population of 103 recombinant inbred lines (RILs, F9-derived lines) developed from the two-row spring barley cross L94x’Vada’ was evaluated under field conditions for resistance against powdery mildew (Blumeria graminis f.sp.hordei) and scald (Rhynchosporium secalis). Apart from the major resistance gene mlo on chromosome 4 (4H), two QTLs (Rbgq1 and Rbgq2) for resistance against powdery mildew were detected on chromosomes 3 (3H) and 7 (5H), respectively. Rbgq1 has not been reported before, and does not map to a chromosome region where a major gene for powdery mildew has been reported. Rbgq2, which appeared in one year’s trial, may be allelic to the Ml(TR) major gene. Four QTLs (Rrsq1, Rrsq2, Rrsq3 andRrsq4) for resistance against scald were detected on chromosomes 3 (3H), 4 (4H) and 6 (6H). All four mapped to places where QTLs for scald resistance have been reported before in different populations. The confidence interval of Rrsq2 contained ml-o.  It cannot be excluded that Rrsq2 is due to a pleiotropic effect of ml-o on scald.

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