Effects of super absorbent polymers on growth and physiological characteristics of Sophora davidii vs. Panjiang seedlings under drought stress

doi:10.11686/cyxb2019510

Abstract

Abstract: In order to investigate the effect of super absorbent polymers (SAP) on the growth and drought resistance of shrub seedlings under drought stress conditions, a pot experiment to study the growth and physiological indexes of the Sophora davidii vs. Panjiang seedlings under different SAP application regimes was conducted. The results demonstrated that a low concentration of SAP increased plant height, stem diameter, leaf length and leaf width of S. davidii seedlings under drought stress. SAP applied at a concentration below 2% effectively increased the concentrations of soluble protein, soluble sugar and proline in the leaves of S. davidii seedlings, and increased the enzyme activity of superoxide dismutase, peroxidase and catalase. These findings indicate that SAP (less than 2% concentration) increases the drought resistance of S. davidii seedlings. A principal component analysis and multivariate data evaluation indicated that the water-retention effect of three tested SAP types were: Wote SAP>potassium salt-type SAP>agroforestry drought-resistance SAP. The Wote SAP (2% concentration) provided the best promotional effect on the growth of S. davidii seedlings and reduction of drought stress damage. The results of the present investigation provide a theoretical basis to enhance drought tolerance and achieve water-savings during cultivation of S. davidii, and can be readily adopted and applied in Karst mountain areas with cultivated S. davidii.

Key words: Sophora davidii, super absorbent polymers, drought stress, physiological index

ZHANG Yu-jun, SHANG Yi-shun, WANG Pu-chang, DING Lei-lei, ZHANG Wen, ZOU Chao. Effects of super absorbent polymers on growth and physiological characteristics of Sophora davidii vs. Panjiang seedlings under drought stress[J]. Acta Prataculturae Sinica, 2020, 29(7): 90-98.

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