Induction of systemic resistance in tomato by some abiotic com-pounds against meloidogyne javanica

Abstract EN

The comparative of some abiotic compounds (Ascorbic acid, Citric acid, DL-Aspartic acid, Indole-3Acetic acid, Indole-3Butyric acid, DL-leucine, Gibberllic acid, L-Arginine and Sulfosalicylic acid), as resistance inducing for managing Meloidogyne javanica infecting tomato (Super strain B Australian cv.

) was studied under greenhouse conditions.

The results showed that all tested compounds reduced all nematode parameters compared with untreated control.

Application of Citric acid caused a superior effect in the reduction percentage of J2 in soil (95.2% ) followed by L-arginine (92.9% ) and then Gibberllic acid (92.2% ).

Also, DL-Aspartic acid gave the highest effect in the reduction percentage of root galls (95.6% ) followed by Citric acid and then L-Arginine acid as following (94.3% and 93.02% ) respectively compared with untreated control.

The treatments of L-arginine followed by Gibberllic acid were recorded the best in plant growth response of tomato plants compared with the untreated control.

Tested abiotic agent inducers activators had the potential to suppress M.

javanica infection through the stimulation of tomato tolerance.

Most of the treatments showed a significant reduction in the percentage values of total and non-reducing sugars comparing with infected and healthy control, while Sulfosalicylic acid and L-arginine recorded high amounts in total and non-reducing sugars.

On the other hand, Dl-Aspartic acid, Indol-3Acetic acid and Citric acid showed a high percentage of total phenols comparing with untreated control.

Among all treatments, only Dl-leucine showed a significant increment in proline comparing with untreated control and healthy control.

The level of Polyphenol oxidase and peroxidase activity increased in the treated plants compared with untreated plants.