Biologia plantarum 2015, 59:171-182 | DOI: 10.1007/s10535-014-0475-9

Effects of exogenous salicylic acid and nitric oxide on physiological characteristics of two peanut cultivars under cadmium stress

L. L. Xu1, Z. Y. Fan1, Y. J. Dong1,*, J. Kong1, X. Y. Bai1
1 College of Resources and Environment, Shandong Agricultural University, Tai'an, P.R. China

The interactive effects of salicylic acid (SA) and nitric oxide (NO) on alleviating cadmium (Cd) toxicity in peanut (Arachis hypogaea L.) were studied. Seedlings of two cultivars (Huayu 22 - a big seed type, and Xiaobaisha - a small seed type) were treated with 200 μM CdCl2 without or with 0.1 mM SA or 0.25 mM sodium nitroprusside (SNP, an NO donor). Results show that the Cd exposure depressed the plant growth of both the cultivars but more of Huayu 22 than of Xiaobaisha. Exogenous SA and NO alleviated Cd toxicity in both the peanut cultivars: they improved growth, chlorophyll content, photosynthesis, and mineral nutrition. Furthermore, exogenous SA or NO decreased oxidative stress by increasing activities of antioxidant enzymes and content of non-enzymatic antioxidants. Besides, in roots and leaves of both the cultivars, exogenous SA and NO increased Cd accumulation in the cell wall and decreased Cd distribution to organelles. In particular, the effect of SA+SNP was most obvious.

Keywords: antioxidants; Arachis hypogaea; chlorophyll; mineral nutrition; net photosynthetic rate
Subjects: salicylic acid; nitric oxide; cadmium; chlorophyll; net photosynthetic rate; superoxide anion; hydrogen peroxide; malondialdehyde; potassium; calcium; magnesium; iron; superoxide dismutase; peroxidase; catalase; ascorbate; glutathione; peanut
Species: Arachis hypogaea

Received: September 14, 2013; Revised: May 23, 2014; Accepted: May 27, 2014; Published: January 1, 2015Show citation

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Xu, L.L., Fan, Z.Y., Dong, Y.J., Kong, J., & Bai, X.Y. (2015). Effects of exogenous salicylic acid and nitric oxide on physiological characteristics of two peanut cultivars under cadmium stress. Biologia plantarum, 59(1), 171-182. doi: 10.1007/s10535-014-0475-9.
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