Resistance to Powdery Mildew of Chinese Wheat Commercial Cultivars and Foreign Materials in Yunnan Province
This study aimed to know the resistance to powdery mildew of major Pm genes used in China,and Chinese wheat commercial cultivars,as well as foreign wheat materials.Field monitoring of 6 Pm genes,46 Chinese wheat cultivars and 66 foreign wheat materials in Licang,Dehong,Dali,Yuxi,Kunming and Zhaotong,Yunnan province had been carried out by natural identification during 2012 and 2013.The results indicated that the resistance of the 6 Pm genes had been lost gradually,decrease of the area of wheat carrying Pm8 and Pm21 is urgent.Pm2,Pm4a,Pm4b and Pm2 + 6 should be used rationally.The resistance level of Chinese wheat commercial cultivars is very low.Among 46 cultivars,none of which showed resistant at 6 sites during the two years in Yunnan,6 cultivars showed susceptible only at one site,18 cultivars showed susceptible at 2 sites,22 cultivars showed susceptible at 3 sites.Among 66 foreign wheat materials,only Hybrid 46 and Heines Kolben showed resistant at 6 sites during the 2 years in Yunnan,which indicated stable resistant.Seven materials showed susceptible only at 1 site,29 materials showed susceptible at 2 sites,28 materials showed susceptible at 3 sites.Those results indicated the lack of resistance sources and cultivars in China at present.Looking for new resistance sources and breeding new resistance cultivars are very urgent.The pressing matter of the moment is strengthening monitoring and emergency control,to ensure wheat security.
NETL
NSTL
万方数据
维普
