Abstract
In a hydroponic culture, experiments were performed to study the influence of potassium (K) supplementation (0, 20, 40, 60, 80, and 100 mg L−1) on the arsenic (As; 0, 8, and 10 mg L−1)-accrued changes in growth traits (plant biomass, root–shoot length) and the contents of lepidine, As and K, in garden cress (Lepidium sativum Linn.) at 10 days after treatment. The changes in these traits were correlated with shoot proline content, protein profile, and the activities of antioxidant enzymes namely superoxide dismutase (SOD, EC 1.15.1.1), catalase (CAT, EC 1.11.1.6), glutathione reductase (GR, EC 1.8.1.7), and ascorbate peroxidase (APX, EC 1.11.1.11). In general, As-alone treatments significantly decreased the growth traits but lead to significant enhancements in shoot proline and enzyme activities. K-supplementation to As-treated L. sativum seedlings decreased shoot-As content, reduced As-induced decreases in growth traits but enhanced the content of shoot proline, and the activities of the studied enzymes maximally with K100 + As8 and As10 mg L−1. Both 8 and 10 mg L−1 of As drastically downregulated the shoot proteins ranging from 43–65 kDa. With As10 mg L−1, there was a total depletion of protein bands below 23 kDa; however, K80 mg L−1 maximally recovered and upregulated the protein bands. Additionally, protein bands were downregulated (at par with As-alone treatment) above K80 mg L−1 level. Interestingly, As-stress increased lepidine content in a dose-dependent manner which was further augmented with the K-supplementation. It is suggested that K protects L. sativum against As-toxicity by decreasing its accumulation and strengthening antioxidant defense system and protein stability.
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Acknowledgments
NG is grateful to Hillel Magen, Director, International Potash Institute (IPI) Switzerland, and to Potash Research Institute of India (PRII), Gurgaon, India for financial assistance. NAA is grateful to FCT (SFRH/BPD/64690/2009; SFRH/BPD/84671/2012) for the postdoctoral fellowship. Authors wish to acknowledge Jamia Hamdard (Hamdard University), New Delhi, India for providing required facilities to carry out the current research. Supports in terms of guidance, facilitating the experiment, and manuscript preparation kindly rendered by Drs. Deepshikha P. Katare and Arshi Anjum are also gratefully acknowledged.
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Umar, S., Gauba, N., Anjum, N.A. et al. Arsenic toxicity in garden cress (Lepidium sativum Linn.): significance of potassium nutrition. Environ Sci Pollut Res 20, 6039–6049 (2013). https://doi.org/10.1007/s11356-013-1624-y
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DOI: https://doi.org/10.1007/s11356-013-1624-y