Development Of Soybean Cultivars With Multiple Nematodes Resistance Essay

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In the mid-1950s, the first SCN resistance soybean sources, PI 90763 and PI 84751 and cultivars Ilsoy and Peking, were identified (Ross and Brim 1957). During the last 20 years, more than 120 soybean germplasm with SCN resistance have been reported (Concibido et al. 2004; Vuong et al. 2013). However, most of them present resistance to only one or few SCN races and only eight soybean germplasm including Peking, PI 88788, and PI 437654 have widely been used for breeding programs in the US (Vuong et al. 2013). Understanding of resistance to the nematodes have remained limited because most of the reported resistance QTL have not been cloned. Also, continuous cultivation of soybean cultivars with the same resistance sources may accelerate selection pressure for SCN as well as other nematode species. Therefore, development of soybean cultivars with multiple nematodes resistance would be essential to prevent losses by the nematodes that can occur in the same field. The lack of diversity for SCN, RKN, and RN resistance source in current soybean cultivars still emphasizes the necessity of identifying new resistance genes/QTL. Therefore, continuous germplasm screening to find new germplasm and genes/QTL would be required for successful soybean breeding programs. The identification of new genetic sources with broad spectrum resistance to multiple SCN HG types, RKN and RN would be beneficial for the development of germplasm and varieties to reduce losses from these nematode species (Lee

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