Dill-Macky R, Roelfs A P
Assistant Professor, Department of Plant Pathology, University of Minnesota.
Research Plant Pathologist, Cereal Disease Laboratory, USDA-Agricultural Research Service, University of Minnesota, St. Paul 55108.
Plant Dis. 1998 Jun;82(6):674-678. doi: 10.1094/PDIS.1998.82.6.674.
The progress of epidemics of race QCCJ of Puccinia graminis f. sp. tritici was examined in field plots of the barley cultivars Robust, Excel, Stander, Azure, Stark, Larker, Bonanza, and Steptoe. In addition, a potential source of resistance (cv. Diamond), and a susceptible line (ND11075) were included. Rust-free treatments were maintained to provide comparisons of grain yield and quality. Barleys with Rpg1, which confers resistance to races of P. graminis f. sp. tritici other than Pgt-QCCJ, were generally more resistant than cultivars or lines that lacked this gene. However the severity of losses indicated that under high disease pressure the resistance conferred by Rpg1 would not be effective. Yield reductions of up to 29% were recorded and were generally associated with reduced grain size and weight. The continued presence of Pgt-QCCJ as a component of the P. graminis population in the United States, since it was first detected in 1989, indicates that Pgt-QCCJ remains a threat to commercial barley production.
在大麦品种Robust、Excel、Stander、Azure、Stark、Larker、Bonanza和Steptoe的田间小区中，研究了小麦条锈菌QCCJ小种的流行发展情况。此外，还纳入了一个潜在的抗性来源（品种Diamond）和一个感病品系（ND11075）。维持无锈处理以比较籽粒产量和品质。具有Rpg1基因（该基因赋予对除Pgt - QCCJ之外的小麦条锈菌小种的抗性）的大麦通常比缺乏该基因的品种或品系更具抗性。然而，损失的严重程度表明，在高病害压力下，Rpg1赋予的抗性将无效。记录到产量降低高达29%，且通常与籽粒大小和重量的降低有关。自1989年首次检测到以来，Pgt - QCCJ作为美国小麦条锈菌种群的一个组成部分持续存在，这表明Pgt - QCCJ仍然是商业大麦生产的一个威胁。
