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In vitro PEG hardening of date palm plantlets Sewi cv. (A) 4 weeks after in vitro treatments. Arrows point to browning regions in the external leaves treated with 30 g L−1 PEG. (B) Plantlets transfer to ex vitro conditions for another 4 weeks. Note: The 20 g L−1 PEG hardened plantlets appeared stronger and grew faster, and this enabled them to tolerate the low relative humidity in the greenhouse.
