Inheritance of Resistance to Puccinia Coronata Var Avenae in Six Selections of Avena Steri is

다국어 초록 (Multilingual Abstract)

Six selections of Avena sterilis, introduced from Israel as sources of resistance to oat crown rust, were crossed
with susceptible A. bywantina 'frazier'. The number of genes conditioning resistance to culture H-14 of race 326 of
Puccinia coronata var. avenae in each of the six selections was determined from studies of F_1, F_2 and F_3
populations from the crosses. P.I.287211, P.I.295919 and P.I.296244 each appeared to have a single dominant gene
for resistance, and P.I.296265 and P.I.296266 each two dominant ones. C.I.8295 had a single partially dominant gene
for resistance. Crosses among the A.sterilis parents indicated that at least four different genes conditioned
resistance to culture H-14.
Association between F_2 reaction to crown rust and morphalogical characters of the spikelet was determined with the
x^2 test for independence. In four crosses, all spikelet characters appeared to be independent of rust reaction. In
Frazier × P.I.296244, basal pubescence of the lemma on the secondary floret appeared to be associated with
reaction to crown rust. Strong association between reaction to crown rust and lemma pubescence on the primary
floret was evident in Frazier × P.I.296265.