Calcium signaling confers nickel tolerance in Cucurbita pepo L. Issue 4 (21st March 2021)

• Record Type: Journal Article
• Authors: Valivand, Maryam; Amooaghaie, Rayhaneh
• Is Part Of: International journal of phytoremediation. Volume 23:Issue 4(2021)
• Page Start: 362
• Page End: 373
• Publication Date: 2021-03-21
• Subjects: Antioxidant enzymes -- Ca2+ signaling -- Cucurbita pepo L. -- heavy metal -- mineral homeostasis -- nickel -- photosynthetic pigments; Phytoremediation -- Periodicals; 628.5
• DOI: 10.1080/15226514.2020.1814992
• Languages: English
• ISSNs: 1522-6514

Abstract

Abstract: Excessive nickel (Ni) accumulation in edible parts of the plants has become a serious challenge for food security over the past few decades. Therefore, in this study, the role of calcium (Ca 2+ ) signaling in imparting Ni tolerance was investigated in zucchini ( Cucurbita pepo L. cv Courgette d'Italie). Exposure of zucchini seedlings to Hogland solution containing 0.28 mmol L −1 Ni(NO3 )2 reduced plant growth, the content of chlorophyll and carotenoids and the relative water content (RWC) in leaves, increased Ni accumulation that was accompanied to depletion of the essential bivalent cations and induced oxidative stress and proline accumulation in both shoots and roots. Pretreatment with the nutrient solution containing 15 mmol L −1 calcium chloride (CaCl2 ), significantly improved zucchini growth and photosynthetic pigment contents and maintained RWC in leaves under both control and Ni stress conditions. Pretreatment with CaCl2 reduced Ni accumulation, modified cation homeostasis, increased the activities of peroxidase and catalase enzymes and lowered Ni-induced accumulation of hydrogen peroxide, malondialdehyde and proline in leaves and roots. Pre-exposure of root with Ca 2+ chelator (ethylene glycol tetraacetic acid) and plasma membrane Ca 2+ channel blocker (lanthanum chloride) impaired impact of Ca 2+ on the aforementioned attributes. Outcomes of this study not only highlight the signaling role of Ca 2+ in regulating defensive responses but also suggest an eco- friendly approach for reducing the Ni contamination in plants that ensure food safety.