J. Agric. Sci. .Mansoura Univ., 31(6):3511-3524 (2006).

INDUCTION OF RESISTANCE IN PEANUT PLANTS AGAINST ROOT ROT DISEASES UNDER GREENHOUSE CONDITIONS BY SOME CHEMICAL INDUCERS

Mahmoud1, E.Y., Samia Y.M. Shokry2 and Zeinab N. Hussin1

1 Plant Pathology Res. Ins., Agric. Res. Center, Giza., Egypt

2 Institute of African Research and Studies, Cairo Univ., Cairo, Egypt

ABSTRACT

The effectiveness of three chemical inducers resistance, hydrogen peroxide (H2O2) at 0.25, 0.5 and 1%, Bion (benzo 1,2,3)thiodiazole-7-carbothioic– methlye ester) and salicylic acid at 2, 4 and 8 mM were tested in greenhouse under artificial inoculations. all tested inducers significantly reduced damping-off, wilt and root rot incidence, Salicylic acid at 4 mM and Bion at 8 Mm followed by Hydrogen peroxide at 0.25 % gave the highest effect on all parameters of disease incidence and consequently increasing percentage of healthy survival plants. Increasing concentration of salicylic acid up to 4 mM and hydrogen peroxide up to 0.25 % led to a decrease in their effect on reducing the disease incidence. While the effect of Bion on reducing of diseases incidence increased with increasing of their concentration. This study indicated that, there is a correlation between induced resistance and some biochemical changes in roots tissues like increased the activity of oxidative enzymes (peroxidase and polyphenoloxidase) and accumulation of phenol compounds. Salicylic acid at 4 mM followed by Hydrogen peroxidase at 0.25% and Bion at 8 mM recorded the highest content of phenol compounds and highest increase of activity of oxidative enzymes (peroxidase and polyphenoloxidase) in roots of peanut plants.

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Keywords: Peanut, groundnut, inducers resistance, hydrogen peroxide (H2O2), salicylic acid, Bion, oxidative enzymes, peroxidase, polyphenoloxidase, phenol compounds    damping-off, root rots, Rhizoctonia. solani, Sclerotium rolfsii, Fusarium solani and Macrophomina phaseolina