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P efficiency-related QTLs mapped on chromosome 4 using 146 RILs across years and treatments. The black arrow denotes the P efficiency-related QTLs (q4-2) mapped to the location of Glyma.04G214000 on chromosome 4. The x-axis scales genetic distance on soybean chromosome 4, while the y-axis represents the LOD scores. Different colors represent different traits across years and treatments (+P−∕+P).
