MERCURY TOLERANCE AND ACCUMULATION IN THE HALOPHYTE SESUVIUM PORTULACASTRUM

doi:10.3773/j.issn.1005-264x.2009.04.002

Abstract

Abstract:

Aims Mercury pollution is a global environmental problem, and heavy metal hyperaccumulator and plant detoxicity is a promising method and current research area. Our objective was to study the halophyte Sesuvium portulacastrum to determine its Hg tolerance and accumulation in order to find a new phytoremediation plant.
Methods Cuttings of S. portulacastrum with one node and two opposite leaves were cultivated on 1/10 Hoagland nutrient solution supplemented with HgCl₂ (0, 5, 10, 25, 50 μmol·L^-1). After 30 d of treatment, we measured growth phenotype and physiological changes such as proline, chlorophyll, electrolyte leakage and Hg²⁺concentration.
Important findings Under low Hg²⁺concentration stress (10 μmol·L^-1), plants showed vigorous growth. The levels of proline, malondialdehyde and electrolyte leakage were similar to those in the untreated plants, but the chlorophyll content was increased. The species could accumulate Hg²⁺, especially in roots, which reached 33.9 μg·g^-1 DW with 50 μmol·L^-1 Hg²⁺ stress. The plants that accumulated 12.02 μg·g^-1 DW Hg²⁺in roots grew well. Thus, S. portulacastrum shows strong Hg²⁺ tolerance and accumulation.

Key words: Sesuvium portulacastrum, abiomercury, growth, tolerance, accumulation

LIANG Sheng-Wei, HU Xin-Wen, DUAN Rui-Jun, FU Shao-Ping, GUO Jian-Chun. MERCURY TOLERANCE AND ACCUMULATION IN THE HALOPHYTE SESUVIUM PORTULACASTRUM[J]. Chin J Plant Ecol, 2009, 33(4): 638-645.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.04.002

https://www.plant-ecology.com/EN/Y2009/V33/I4/638

Figures/Tables 5

Fig. 1 The effect of Hg2+ stress on growth of Sesuvium portulacastrum

Table 1 The effects of Hg2+ on growth of Sesuvium portulacastrum (mean±SE)

Hg²⁺(μmol·L^-1)	鲜重 FW (g)	干重 DW (g)	根长 RL (cm)
0	2.62±0.48^a	0.21±0.02^a	10.2±0.2^a
5	2.61±0.32^a	0.21±0.02^a	9.5±0.4^a
10	2.39±0.24^a	0.21±0.02^a	8.6±2.2^a
25	2.34±0.24^a	0.24±0.03^a	8.4±0.6^a
50	2.38±0.63^a	0.23±0.06^a	8.2±1.2^a

Fig. 2 Chlorophyll and proline contents in the leaves of Sesuvium portulacastrum under Hg2+ stress

Fig. 3 The effects of Hg2+ stress on electrolyte leakage rate and malondialdehyde (MDA) content in Sesuvium portulacastrum roots

Fig. 4 The effects of Hg2+ stress on the contents of Hg2+, Na+, K+, and Ca2+ in Sesuvium portulacastrum

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