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Axial root length of crown, primary, and seminal roots under high-N (HN) and low-N (LN) conditions at 42 days after planting in greenhouse mesocosms. The data shown are means of four replicates of the nine genotypes in each phenotypic class in either HN or LN ± SE. Different letters represent significant differences (P < 0.05) compared within each root class.
