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Contrasting rooting depth of two pairs of wheat near-isogenic lines (NILs) at 42 days after transplanting in a semi-hydroponic system in a glasshouse: (a) rooting depth of a NIL2a (72.8 cm) and a NIL2b (134.2 cm) plant, and (b) a NIL4a (134 cm) and a NIL4b (95.4 cm) plant. The white bar indicates a 40 cm scale.
