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Abstract
Soybean cyst nematode (SCN) is the most damaging pest causing yield loss with more than $1.5 billion in soybean production in the U.S. However, the majority of resistant cultivars have their resistance derived from Plant introduction (PI) 88788 and ‘Peking’ carrying two major quantitative trait loci (QTLs) Rhg1 and Rhg4. Using limited genetic sources of resistance has caused SCN to overcome their resistance, therefore, it is critical to identify additional major QTLs to slow down SCN adaptation. PI 567295 was found as resistant to multiple SCN populations and a QTL on Chr 10 was found associated with resistance to two Heterodera glycines (HG) type 0 and 1.2.-. Two minor QTLs on Chrs 6 and 8 were also mapped for HG type 1.2.- resistance. The result provides an additional resistant source and SNP markers for developing SCN resistant cultivars. Besides, the root microbiome plays an important role in plant growth and health, so understanding the composition of the root microbiome is necessary to discover beneficial bacteria related to significant pathogens and pests such as SCN. Two field tests in Plains, GA, and a greenhouse test with SCN pressure were conducted to describe the root bacteria microbiome of bulked soil, rhizosphere, and root of soybean. The core of bacteria in soybean roots was identified and some beneficial bacteria might contribute to SCN management.