Utilization of Some Specific Materials to Stimulate Resistance in Some Host Plants Against the Root-knot Nematodes

Abstract

Induce resistance in plants against nematodes by using specific chemicals has lately been in focus of interest. Some amino acids, vitamins, organic acids and inorganic fertilizers were used in this study to evaluate their efficacy m reducing counts of Meloidogyne incognita on soybean. Of ammo acids, L­

hydroxyproline was the most effective in reducing

nematodes and

improving the plant growth. However, other amino acids have also decreased the nematode counts in varying degrees. The commercial product "Amino green" and other related "Amino" products enriched with some nutrient minerals were also evaluated. "Amino K" was ,in general, the best compound. Variability in efficacy of vitamins was also noticed; however, vitamin C performed adverse effect on nematode counts and improved the plant growth. Salicylic acid was the best amongst the tested organic acids in such matter. Of inorganic minerals, both Mg S04 and Mn S04 had satisfied effects. Accordingly, chemicals with the best results were involved in different four designs for nematode management on soybean plants in cement-micro plots and on grapevines under field conditions. Basically, the designs were consisted of "Amino K" or hydroxyproline plus K2 S04 + ascorbic acid + salicylic acid + Mg So4 or Mn S04 . Two spray applications were better than one spray; and designs of hydroxyproline were mostly effective than those

contained "Amino K". Anatomical alterations in

treated-infected

soybean roots and enzymatic activities of such roots resembled those of the resistant,:; hosts. Thus, chemicals of the tested designs could

induce resistance in treated plants against M safely be utilized.

incognita, which can