Plant growth promoting rhizobacteria (PGPR) alleviate toxicity of cadmium on germination and early seedling growth of fennel

摘要

Recently, bioremediations is a developing process which applies microorganisms such as bacteria for ameliorating heavy metal toxicity. This experiment was conducted to evaluate the effect of plant growth promoting rhizobacteria (PGPR) on germination and early growth in fennel under arsenic (As) contamination. Experiment was arranged in factorial based completely randomized design with three replications. The first factor was As at four levels (consist of 0, 30, 60 and 90 mg L - 1) and the se cond factor was PGPR (with and without PGPR). Results showed that main and interaction effect of two factors revealed that inoculation of PGPR could increase vigor index, shoot and seedling length, while As significantly affected all traits. Increasing As levels significantly decreased root length, weight vigor index and seedling length up to 99, 100 and 99 percent compared to control, respectively. Meanwhile, inoculation of PGPR at 30 mg L - 1 As significantly improved germination rate and percent. Also, wei ght vigor index markedly enhanced (nearly 20%) by application of PGPR compared to control.