Determination of the Effects of Plant Growth-Promoting Rhizobacteria Applications on Kober 5 BB American Grapevine Rootstock in Lead Stress

Abstract

Plant growth-promoting rhizobacteria (PGPR) are free-living soil bacteria that can affect plant growth by the synthesis of phytohormones and vitamins, inhibiting plant ethylene synthesis, enhancing stress resistance, improving nutrient uptake and mineralising organic phosphate. In this study, it was aimed to determine the effects of PGPR application on Kober 5 BB grapevine rootstock under the lead stress. Different lead concentrations (0; 10, 25 and 50 ppm Pb(NO₃)₂) were applied to plants. Some morphological characteristics (shoot length, shoot weight, average number of leaf per shoot) and biochemical characteristics (chlorophyll, degree of membrane injurity, proline, total phenolic compound and lipid peroxidation) were tested in the study. As a conclusion, the damage by lead stress generally reduced with the PGPR treatment.

Keywords: American Grapevine Rootstock, Lead, PGPR, Proline, Total Phenolic Compound.