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1519031 
Journal Article 
Arsenic toxicity in garden cress (Lepidium sativum Linn.): Significance of potassium nutrition 
Umar, S; Gauba, N; Anjum, NA; Siddiqi, TO 
In Press 
Yes 
Environmental Science and Pollution Research
ISSN: 0944-1344
EISSN: 1614-7499 
20 
6039-6049 
English 
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. 
Arsenic; Toxicity; Lepidium sativum; Lepidine; Amelioration; Potassium 
IRIS
• Arsenic Hazard ID
          PubMed
          Considered New
          ToxNet
          Considered New
          PubMed
          WOS
          ToxNet
          Excluded
               Toxnet Duplicates
          PubMed
          ToxNet
          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
          ToxNet
          Excluded
               Toxnet Duplicates
     2. Lit Search Updates through Oct 2015
          PubMed
          WOS
          ToxNet
          Considered
     7. Other Studies through Oct 2015
          Ecology
• Arsenic (Inorganic)
     1. Literature
          Lit search updates through Oct 2015
     3. Hazard ID Screening
          Other potentially supporting studies
NAAQS
• ISA-Ozone (2020 Final Project Page)
     Literature Search Results
     Literature Search - Included
          Citation Mapping
               Ecology
     Title-Abstract Screening (SWIFT-AS) - Excluded
          SWIFT-AS Excluded