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Scientists have widely applied transgenic technology to plants. We transferred the TaLEA gene to Populus simonii × P. nigra (Xiaohei Poplar), obtained ten transgenic poplar clones and analyzed these clones in a greenhouse and woodland. The heights (H), basal diameters (BD), and diameter at breast high (DBH) were significantly different (P < 0.01) among the 11 test clones (the ten above and one...