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Representative image of normal and cluster roots in hydroponically cultivated Pi-deficient white lupin plants. The tips of the secondary lateral roots and unbranched proximal root denote the normal roots. Developmental stages of CRs are labelled according to the number of days following rootlet emergence: juvenile (1–3 d), mature (4–6 d), senescing (7–9 d) and senesced (≥10 d). Scale bar = 35 mm.
