Effects of Calcium and Magnesium Fertilization on Antioxidant Activities during Cassava Postharvest Physiological Deterioration
2018
Djabou, Astride Stéphanie Mouafi | Qin, Yuling | Thaddee, Boudjeko | Figueiredo, Priscila Gonzales | Feifei, An | Carvalho, Luiz J. C. B. | Omokolo, Denis Ndoumou | Li, Kaimian | Niemenak, Nicolas | Chen, Songbi
The current research addressed the effect of fertilizers containing Ca²⁺ and Mg²⁺ on cassava (Manihot esculenta Crantz) storage roots (CSRs) during postharvest physiological deterioration (PPD). Cassava PPD tolerant and susceptible genotypes were grown in pots and treated with fertilizers containing Ca²⁺ or Mg²⁺. Eight months after planting, CSRs were harvested and stored at room temperature for 30 d. Morphological changes, antioxidant activities, mineral content, and starch content were determined. The results indicated that application of Ca²⁺ and Mg²⁺ fertilizers delayed PPD for >10 d in the susceptible genotype (SC5), but Mg²⁺ fertilizer elevated PPD in the tolerant genotype (QZ1). The Ca²⁺ fertilizer significantly increased fresh weight. A significant decrease in starch content in CSRs of SC5 treated with Mg²⁺ fertilizer was observed. The Mg²⁺ fertilizer slightly enhanced Ca²⁺, Mg²⁺, and K⁺ contents in both genotypes. In addition, Ca²⁺ fertilization led to a significant increase in H₂O₂ content and subsequent elevation of activities of catalase and peroxidase in both genotypes, especially at harvest. Our findings suggest that soil fertilization with fertilizers containing Ca²⁺ and Mg²⁺ may play a distinct role in PPD delay in CSRs.
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