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用从宁夏主要栽培品种京引39号上分离获得的33个代表菌株,与18个宁夏水稻主要代表品种间的相互作用,分别计算每两个品种与一系列菌株的联合致病性系数(PAC)和联合强致病性系数(VAC)。结果表明,宁夏稻瘟病菌对京引39号等生产品种的各种组合表现高PAC和高VAC;对抗源品种的某些组合为高PAC和高VAC,对另一些组合表现为高PAC和低VAC;对区试品系表现高PAC和高VAC或高PAC和较低VAC;生产品种与区试品系的组合,大都表现出高PAC和高VAC。高PAC和低VAC相应的各组合品种(系)抗性基因,在抗病育种和品种布局上有重要的使用价值;高PAC和高VAC表明该类型的组合品种抗性基因无实际使用价值。
By using the interaction between 33 representative strains isolated from Jingyin 39, a major Ningxia cultivar, and 18 representative rice varieties in Ningxia, the joint pathogenicity coefficient (PAC) ) And joint strong pathogenicity factor (VAC). The results showed that all combinations of Magnaporthe grisea from Ningxia were high PAC and high VAC for various combinations of cultivars Jingyou 39 and some combinations of high and low VAC for resistant cultivars were high PAC and low for other combinations VAC; high-PAC and high-VAC or high PAC and low VAC for the regional test strains; most of the combinations of the cultivars and the regional test strains showed high PAC and high VAC. High PAC and low VAC corresponding combinations of varieties (lines) resistance genes, resistance breeding and variety layout has important value; high PAC and high VAC show that the combination of this type of resistance genes have no practical value.