首页|Exogenous application of succinic acid enhances tolerance of Larix olgensis seedling to lead stress

Exogenous application of succinic acid enhances tolerance of Larix olgensis seedling to lead stress

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Larix olgensis A. Henry (Changbai larch) is a productive commercial species and good candidate for afforestation in northeast China. It is widely planted in lead-stressed soils which can induce oxidative damage in this plant. Increasing tolerance to lead (Pb) stress is therefore of keen interest. A greenhouse experiment was conducted to identify the biomass, physiological responses and Pb accumulation of L. olgensis seedlings to Pb stress under succinic acid (SA) application and to explore the interaction of exogenous SA applications and stress resis-tance. L. olgensis seedlings were planted in Pb-stressed or unstressed haplic cambisols in pots. In Pb-contaminated soils the seedlings were treated daily with concentrations of SA solutions at a rate approximately equivalent to 0, 0.04, 0.2, 1.0, or 2.0 mmol kg-1 of soil for 10, 20, and 30 days, respectively. Pb treatment induced damage in the seedlings and led to the inhibition of biomass accumulation in roots,stems and leaves, and a rise in Pb accumulation in fine roots and leaves. Malondialdehyde (MDA) content and electrolyte leakage in leaves significantly increased while peroxidase (POD) activities, soluble protein and photo-synthetic pigment contents in leaves were all reduced. Physiological toxicity was promoted with increasing Pb treatment times. When Pb-stressed seedlings were exposed to SA (especially 10.0 mmol L-1 over 20 days), the physiological responses for Pb-only were reversed and the biomass of roots, stems, and leaves dramatically increased. SA facilitated Pb uptake in fine roots and leaves but more Pb accumulated in fine roots. The results demonstrate that exogenous SA alleviates Pb-induced oxidative injuries and improves the tolerance of L. olgensis seedlings to Pb stress.

Soil Pb stressSuccinic acidLarix olgensisPhysiological responsePb uptake

Jinfeng Song、Hongguang Zhang、Chengwei Duan、Xiaoyang Cui

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School of Forestry, Northeast Forestry University, 26 Hexing Road, Harbin 150040, People's Republic of China

Maoershan Forest Research Station, Northeast Forestry University, 26 Hexing Road, Harbin 150040, People's Republic of China

This work was financially supported by the National Natural Science Foundation of Chinaand the Fundamental Research Funds for the Central Universities

313706132572017CA03

2018

林业研究(英文版)
东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDCSCDSCI
影响因子：0.365
ISSN：1007-662X
年,卷(期)：2018.29(6)
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