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Mutants of barley with induced resistance to powdery mildew.

Six new mutants of barley with induced resistance to powdery mildew, Erysiphe graminis f. sp. hordei, are reported. They are designated SR 1 (Refoma), SR 3, SR 4, SR 7, SR 8, and SR 10. 
 
 
 
From a practical point of view, SR 1, SR 7, and SR 10 are the most valuable and therefore, the most studied of these mutants. None of these three has so far been reported susceptible to mildew. They have the similar almost immune type of reaction as, e.g. M.C. 20 and Mut 3502, permitting a few colonies of mildew to develop on each plant. 
 
 
 
Genetical analysis has shown that each of them has a single, recessive factor conditioning resistance and that these factors are heteroalleles. The same is also shown for SR 1 and M.C. 20, indicating that SR 1 as well as SR 7 and SR 10 all are induced in the ml-o locus on chromosome 4. A possible linkage to Ml-g locus in chromosome 4 is also observed. Independent inheritance on the other hand is found versus different Ml-loci and marker genes in chromosome 5. Free recombination was also obtained in crosses to translocations, involving all chromosomes except chromosome 2. 
 
 
 
In comparative trials, SR 1 yielded about 5% less than the mother variety Foma. Also, straw stiffness and grain size were less than for Foma. Mutants SR 7 and SR 10 also showed a decreased seed size.