Resumo

GONZALEZ CORTES, Areli et al. Effect of antioxidants and sings in potato plants (Solanum tuberosum L.) infected with Candidatus Liberibacter solanacearum under greenhouse conditions. Rev. colomb. biotecnol [online]. 2014, vol.16, n.2, pp.114-121. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v16n2.40728.

In Mexico, the losses caused by the purple top syndrome in potato range from 30 to 95%. This syndrome has been greatly associated with the bacterium Candidatus Liberibacter solaneacearum, which produces reduction in yield and in crop quality, the tubers have internal browning, which is not desirable either for fresh consumption or for the industry. Present study was conducted to evaluate the efficiency of three products that act as antioxidants and / or signs to reduce damage on potato caused by Ca. L. solanacearum under greenhouse conditions. Plants uninfected and infected with the bacterium, produced in vitro were used. The products evaluated were: dehydroascorbic acid (600 ppm), ascorbic acid (600 ppm) and hydrogen peroxide (1 mM), and were applied to infected and uninfected plants twice a week. Infected and uninfected plants without application of antioxidants were used as control treatments. To avoid experimental error in the application of the products evaluated the experimental design was a randomized complete block. A reduction of potato damage by Ca. L solaneacearum was registered, and there were significant differences among treatments in the tubers production. The largest tuber number in treatments that included uninfected plants was obtained in the hydrogen peroxide application, which exceeded a 33 %, 48 % and 59 % to plants treated with dehydroascorbic acid, with ascorbic acid and the controls respectively. Similarly, the largest tuber number in treatments included infected plants was obtained by hydrogen peroxide, and it exceeded a 33%, 17 % and 67 % to treatments with dehydroascorbic acid, with ascorbic acid and the controls respectively. These results show a potential effect of the products evaluated to protect potato plants against Ca. L. solanacearum, although its function is not to diminish the growth or development of bacteria.

Palavras-chave : Dehydroascorbic acid; ascorbic acid; hydrogen peroxide; syndrome; purple top; potato.

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