Resistance of CIMMYT Wheat Germplasm to Heterodera filipjevi Xuchang Population from Henan Province, China

The cereal cyst nematode (CCN) of wheat has become a severe disease in recent years. Heterodera filipjevi is a new pathogenic nematode in China. For screening resistant resources to H. filipjevi, the resistance of 75 wheat cultivars or lines from the International Maize and Wheat Improvement Center (CIMMYT) was evaluated in greenhouse and field conditions using relative resistance index (RRI) and Pf/Pi ratios, with the nematode from Xuchang population, Henan Province, China. No cultivar was immune to H. filipjevi. However, line 6R(6D) was highly resistant in both test conditions. Lines CROC_1/AE.SQUARROSA(224)//OPATA*1, CROC_1/AE.SQUARROSA (224)//OPATA*2, MACKELLER, CPI 133842, CPI 133814, and TRIDENT were moderately resistant to H. filipjevi in the greenhouse test. In the field test, CPI 133842, CPI 133814, DURATI, and TURCAN#39 showed a high resistant reaction with RRI values ranging from 0.90 to 0.96. Fourteen lines including ID-2150, BAXTER, and MACKELLER were moderately resistant to H. filipjevi. The disease severity was heavier in the greenhouse test than in the field test, and resistance identification in the greenhouse is much easier and reliable. The results indicated that relative resistance index (RRI) is an efficient index for evaluating the resistance of wheat cultivars to CCN.