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Management Of Soybean Cyst System

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Management of Soybean Cyst Nematode
Soybean cyst management tactics include different methods from place to place, but all have the common method of using resistant soybean cultivar and crop rotation and these are found to be more effective than others tactics.(Niblack et al., 2003, Schmitt et al., 2004a, Oyekanmi & Fawole, 2010).
Host Resistance
Different resistance genes have been exploited from different soybean germplasm for developing resistant soybean cultivar against Heterodera glycines (Concibido et al., 2004b). The resistance genes to Heterodera glycinces were explored first time in soybean germplasm Peking, which conferred three recessive genes rhg1, rhg2, and rhg3 in 1960(Caldwell et al., 1960) later the fourth new dominant gene Rhg4 resistant to Heterodera glycinces was also identified in Peking, which was closely linked to i locus and responsible for distribution of pigmentation of seed coat(Matson & Williams, 1965). Likewise the another dominant resistant gene was discovered in germplasm PI88788 and later named as Rhg5(Rao-Arelli et al., 1992, Rao-Arelli, 1994). For developing resistant cultivar against Heterodera glycines seven differential line PI 548402(Peking), PI 88788, PI 90763, PI 437654, PI 209332, PI 89772, PI 548316 (Cloud) are mostly used out of those seven lines PI 548402(Peking) and PI 88788 constitute more than 90% of the resistant cultivar in the United states (Concibido et al., 2004a, Shannon et al., 2004, Schmitt et al., 2004b). A novel QTL

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