Abstract:

The seedlings of Populus talassica × P. euphratica were treated with different concentrations of Na₂SO₄ in pot culture, and the physiological indexes were determined to evaluate their physiological adaptability to Na₂SO₄ environment. One-year-old P. talassica × P. euphratica seedlings were treated with 0, 50, 100, 150 and 200 mmol/L Na₂SO₄ in pot experiment to determine and analyze the physiological indexes. Compared with the control, lipid peroxidation (MDA content increased) of cell membrane occurred in 50-200 mmol/L Na₂SO₄ treatment, but the selective permeability of cell membrane was not destroyed. The three protective enzymes showed different trends (SOD activity remained unchanged, CAT activity decreased first and then increased, POD activity increased), soluble proteins and soluble sugars exhibited complex metabolic adaptation in Na₂SO₄ environment. The results showed that Na₂SO₄ treatment had no stress on P. talassica× P. euphratica seedlings, which could adapt to 0-200 mmol/L Na₂SO₄ environment. The study can provide references for planting P. talassica × P. euphratica with strong stress resistance in Tarim basin.

Key words: Populus talassica× P. euphratica, seedling, Na₂SO₄ environment, stress, physiological response