Abstract
Knowledge of the ionome of plant organs helps us understand a plant’s nutritional status. However, the ionome of Macadamia (Proteaceae), which is an important nut-producing tree, remains unknown. We aimed to characterise the allocation of biomass and nutrient-partitioning patterns in three macadamia genotypes. We excavated 15 productive trees (three cultivars at 21 years of age; two cultivars at 16 years of age) in an orchard. Biomass, nutrient concentrations, and contents of roots, stems, branches, and leaves were analysed. Dry weight of roots, stems, branches and leaves accounted for 14–20%, 19–30%, 36–52%, and 12–18% of total plant weight, respectively. No significant difference was found in the total biomass among the cultivars at the same age. Compared with most crop plants, macadamia had low phosphorus (P) concentrations in all organs (<1 g kg−1), and low leaf zinc (Zn) concentration (8 mg kg−1). In contrast, macadamia accumulated large amounts of manganese (Mn), with a 20-fold higher leaf Mn concentration than what is considered sufficient for crop plants. Leaves exhibited the highest nutrient concentrations, except for iron and Zn, which exhibited the highest concentrations in roots. The organ-specific ionomics of Macadamia is characterised by low P and high Mn concentrations, associated with adaptation to P-impoverished habitats.
Funder
National Science Foundation of China
Sci-Tech Innovation System Construction for Tropical Crops Grant of Yunnan Province
Hainan Provincial Natural Science Foundation of China
Project of New Fertilizer Research and Development of Yun-Tian-Hua Group of Yunnan of China
The 2115 Talent Development Program of China Agricultural University
Subject
Plant Science,Agronomy and Crop Science
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