Components of slow rusting resistance in Ethiopian Barley Landrace lines infected with Puccinia Hodei.
2007
G. Woldeab;Fininsa,C.; Singh,H. and E. Bekele(Researcher)
Slow rusting resistance of Hordeum vulgare against Puccinia bordei was assessed under field and greenhouse conditions.Seventeen Ethiopian barley landrace derived lines and five checks infected with five pathotypes of P. bordei were used.Latent period (LP50), pustule size (PS) and indection types (IT) were recorded.The landrace lines, pathotypes and landrace line by pathotype interaction in latent period and lines, pustule position/location,pathotype and pustule position by pathotype interaction in pustule size differed significantly (P0.001) at seedling and flag leaf growth stages. The duration of latent period and the size of pustules caused by diffeernt isolates have no association with the virulence spectrum of the pathotypes used.manay of the lines had significantly longer latent period and smaller pustule size than the susceptible check, L94, but none of the lines had significantly longer latenet period and smaller pustule size as compared to the known partial resistnat check vada.Sixteen lines in latent period and 17 in pustule size were as resistant as the cultivar Vada at flag leaf stage.Pustule sizes at both growth stages were significantly smaller (P0.001) on the tip than on the middle and basal part of the leaf blade.The number of paritial resistnat lines in LP50 and PS varied depending on the type of pathotypes used.Means for latent period and pustule size within and across the pathotype(s) showed that lines 1686-87, 3262-64,3262-69,1686-79,1686-49,1686-29,1686-69,1686-50,1686-83,3262-03, and 3255-35 possessed high level of partial resistance to P. bordei pathotypes.
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