**4. Impact of PGPF on plant growth promotion**

PGPF exhibit traits beneficial to plant and as such, their capacity to enhance plant growth and development is well founded. PGPF mediate both shortand long-term effects on germination and subsequent plant performance. Improvement in germination, seedling vigor, shoot growth, root growth, photosynthetic efficiency, flowering, and yield are the most common effects decreed by PGPF. A particular PGPF may condition plant growth by exerting all or one or more of these effects.
