Journal
ANTIOXIDANTS
Volume 12, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/antiox12071447
Keywords
starch metabolism; antioxidant activity; potato; ToLCNDV; source-sink
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The potato apical leaf curl disease caused by ToLCNDV-potato significantly affects the morphological parameters and photosynthetic pigment system in potato cultivars, with a lower impact observed in the tolerant cultivar. The viral infection also leads to increased leakage of oxidative metabolites and imbalance of starch metabolism, resulting in altered carbohydrate profiles. Furthermore, antioxidant enzyme activity is enhanced, particularly in the resistant cultivar. These findings contribute to our understanding of regulatory mechanisms and provide insight for breeding potato varieties with tolerance to ToLCNDV-potato.
The potato apical leaf curl disease is caused by tomato leaf curl New Delhi virus-potato (ToLCNDV-potato), which severely alters a plant's starch metabolism, starch hydrolysing enzymes, and antioxidant mechanism. In this study, the result suggested that ToLCNDV-potato significantly (p < 0.01) affected the morphological parameters and photosynthetic pigment system in both the cultivars of potato, viz., Kufri Pukhraj (susceptible) and Kufri Bahar (tolerant). However, the impact of ToLCNDV-potato was lower in Kufri Bahar. Moreover, the viral infection in potato showed significant (p < 0.01) enhancement in the leakage of plant oxidative metabolites such as proline and malondialdehyde (MDA) which was further confirmed with higher electrolyte leakage. The viral infection imbalance of starch metabolism in the leaves ultimately affects the carbohydrate profile. ToLCNDV-potato significantly lowered starch synthesis, enhanced the accumulation of sucrose, glucose, fructose and-which was further validated by enzymatic estimation of & beta;-amylase-& alpha;-amylase and phosphorylase activity in the leaves of both cultivars. The antioxidant enzymes, viz., catalase, ascorbate peroxidase, and superoxide dismutase, were reported to be enhanced in both the cultivars due to ToLCNDV-potato infection. The higher enhancement of antioxidant enzyme activity was observed in Kufri Bahar, which signifies its resistant attributes. These findings in the potato plant broaden our understanding of the regulatory mechanisms of starch metabolism and antioxidant activity and provide proof of concept for breeding potato for ToLCNDV-potato tolerance.
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