Leaf stripe is a seed-borne barley disease, caused by Pyrenophora graminea.Reactions of cultivars to leaf stripe show great variability, and one race-specific resistancesystem (Rdg1a gene) has been described. In this work it was studied the response of seventwo-rowed and two six-rowed cultivars, and of a two-rowed line to the highly virulent isolatesDg2 and Dg5 of Pyrenophora graminea.NILs have been developed from two highly resistant six-rowed winter cultivars, Thibaut andOnice, after six backcrosses to susceptible cultivar Mirco, in order to map these new sourcesof resistance by means of BSA (Bulked Segregant Analysis).Colinear maps of barley chromosome 1(7H) have been drawn, where the major QTL ofresistance of cv. 'Proctor' to leaf stripe, and two other resistance (R) genes to barley pathogenshave been mapped. These R genes, RsmMx to the seed-borne virus BSMV (Barley StripeMosaic Virus), and Rpt4 to Pyrenophora teres, are associated to common markers in thebarley genome and could help to explain the biological role of the leaf stripe QTL.
|Anno di pubblicazione:||2000|
|Titolo:||The resistance of barley to leaf stripe.|
|Autori:||Pecchioni N.; G. Tacconi; L. Arru; L. Bellini; G. Vale|
|Appare nelle tipologie:||Articolo su rivista|
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