Effects of Mn2+ and Pb2+ on seed germination and seedling growth of Elymus nutans

doi:10.11686/cyxb2017387

Abstract

Abstract: In order to provide reference for contaminated soil and vegetation restoration in the Tibetan mining area, a study has been undertaken of the physiological response of Elymus nutans’ seed germination and seedling growth to heavy metal Mn²⁺ and Pb²⁺ stress in Baqing county, Tibet. Select wild E. nutans from the county were used as test materials for investigation using germination methods. The results showed that Mn²⁺ and Pb²⁺ ion stress had a significant effect on seed germination and seedling growth. With increasing Mn²⁺ and Pb²⁺ concentrations, the germination percentage, germination vigor, germination index, vigor index and bud length of E. nutans showed a declining trend. Under a solution concentration of 200 mg·L^-1 Mn²⁺ and Pb²⁺, the shoot length of E. nutans was slightly longer than that of the control. With increasing Mn²⁺ and Pb²⁺ concentrations, the contents of chlorophyll a and chlorophyll b in leaves decreased while electrical conductivity and malondialdehyde content showed a rising trend. This study suggests that E. nutans has some tolerance to Mn²⁺ and Pb²⁺ ion stress that makes it a useful application for soils that are mildly contaminated with these toxins.

XU Ya-mei, WANG Chuan-qi, WU Jun-xi, ZHANG Wen-jing, WANG Xiao-chuan, Chilie Cuizhen, XU De-fei, Baosai Heina, MIAO Yan-jun. Effects of Mn²⁺ and Pb²⁺ on seed germination and seedling growth of Elymus nutans[J]. Acta Prataculturae Sinica, 2018, 27(3): 194-200.

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Effects of Mn²⁺ and Pb²⁺ on seed germination and seedling growth of Elymus nutans

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