Articles

POSTHARVEST SODIUM SILICATE TREATMENT INDUCES RESISTANCE IN POTATO AGAINST FUSARIUM SULPHUREUM

Article number
877_230
Pages
1675 – 1681
Language
English
Abstract
Dry rot, caused by Fusarium spp. is reported as the most important postharvest disease of potato in China. Fusarium sulphureum is one of the principal pathogens.
Potato (‘Atlantic’) tuber and slices treated by sodium silicate at 100 mM were investigated to reduce dry rot and to induce defense responses.
The results showed that sodium silicate significantly decreased lesion expansion on tuber challenged inoculation 3 days after treatment and infection ability of F. sulphureum inoculated on slices 48 hours after treatment.
The activity of peroxides (POD), polyphenoloxidase (PPO), phenylalanine ammonialyase (PAL) and β-1, 3-glucanase (GLU) and the production of total phenolic, flavanoid in tuber tissue after treatment with 100 mM of sodium silicate were not higher than that of control, even lower during early treatment period, although the value of them gradually increased with treatment time prolonging.
However, the activity of POD, PPO, PAL and GLU and the production of total phenolic, flavanoid dramatically increased after challenging with F. sulphureum. The results suggested that sodium silicate could enhance defense responses in potato tubers against pathogen infection.

Publication
Authors
Y.C. Li, X.J. Sun, Y. Bi, Y. Wang
Keywords
potato tuber, GRAS substance, dry rot, induce disease resistance
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