IPI International Potash Institute
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Scientific abstracts

Amelioration of Cadmium Stress in Gladiolus (Gladiolus grandiflora L.) by Application of Potassium and Silicon
Malik Muhammad Zaheer, Nasim Ahmad Yasin, Sajid Rashid Ahmad, Waheed Ullah Khan, Aqeel Ahmad Aamir Ali, and Shafiq Ur Rehman
Published in:
Journal of Plant Nutrition 41(4):461-476 (2018), English


Gladiolus corms were grown in media contaminated with cadmium (Cd) (50 mg kg−1) and supplemented with silicon (Si) and potassium (K). The role of Si and K for mitigation of Cd toxicity was evaluated. Cd-induced stress generated significantly increased level of oxidative stress markers including hydrogen peroxide (H2O2), and malondialdehyde (MDA) in gladiolus. The application of K and Si improved the production of protein and proline in the treated plants. Moreover, K and Si supplemented plants exhibited an improvement in the activity of antioxidant enzymes and a reduction in the level of MDA, H2O2 and Cd uptake under Cd stress. Application of K and Si also enhanced the uptake of mineral nutrients including calcium (Ca), magnesium (Mg), manganese (Mn), sulfur (S) and K. The plants supplemented with K and Si exhibited a higher amount of total phenolics and flavonoids. The combined effect of Si and K was more pronounced regarding beneficial effects on gladiolus plants compared to individual effect of these elements under Cd stress. The current research reveals that Si and K may improve gladiolus growth by decreasing the oxidative stress and Cd uptake and by increasing the activity of antioxidant defense enzymes, the quantity of secondary metabolites and plant nutrition.

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