Effects of Inoculation with Different Strains of Azospirillum Brasilense on Wheat Roots Development
Inoculation of wheat seedlings (Triticum durum var. Appula) with different wild type strains of Azospirillum brasilense significantly increased the number and length of lateral roots, even if the increase due to the inoculation with strain Sp6 was always higher than that obtained with strains Sp7 and F14; instead, inoculation with strain 7310, a derivative of Sp7, unable to produce indole-3-acetic acid, did not elicit any response from the plant. Control uninoculated experiments in which different concentrations of indole-3-acetic acid were added, apparently showed a dose-effect on root system development. Root system was affected by the inoculum concentration: 106 cfu/ml caused the greatest increase in the number and length of lateral roots, while 109 cfu/ml inhibited root development.
Keywordsindole-3-acetic acid wheat root system development
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