Abstract
The successful adoption of water recycling strategies in many arid regions will require crops able to tolerate poor-quality waters. We evaluated different clones for salt and boron (B) tolerance within each of seven genetically distinct genomic groups (e.g., deltoides, deltoides × nigra, trichocarpa × deltoides, trichocarpa × deltoides × maximowizcii, trichocarpa × deltoides × nigra, trichocarpa × nigra, trichocarpa × maximowizcii). During each evaluation period, different clones within each of the groups were irrigated with high sodium chloride (NaCl) salinity (i.e., 10–30 dS m−1) and B (i.e., 10 mg L−1) water up to a maximum of 150 days, for a 4-year testing period under micro-field plot conditions. Excessive accumulation (up to 6%) of chloride (Cl) likely caused toxicity symptoms (necrosis of the leaves) observed in the less tolerant clones, while leaf B concentrations rarely exceeded 300 mg kg−1 DM in any clone. Increased soil salinity likely hindered the uptake of B by the clones. Our results show that a wide range of selected Populus clones, of parentage trichocarpa × nigra, followed by deltoides × nigra show potential salt and B tolerance as young trees to recycled waters high in salinity and B.
Published Version
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