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Plant growth-promoting rhizobacteria (PGPR) can effect plant growth and development in two different ways: indirectly or directly. Indirect promotion of plant growth occurs when these bacteria decrease or prevent some of the deleterious effects of phytopathogenic microorganism. The most important way is the direct way, when bacteria promote plant growth by providing the plant with a compound that is synthesized by the bacteria from plant rhizosphere. From this point of view there are many studies that show the imp...

In this paper we present the critical situation of four species of Gymnosperms (Pinus nigra and Pinus sylvestris, Picea abies, Abies alba.) which can be found in areas of industrial zone from Bicaz District, Romania. The pollutants are mainly solid: lime and cement dust. Our investigation it is about the physiological and histo – anatomical modifications of the leaves (needles). We want to stress the fact that the large quantity of dry substance from the leaves isn’t always related to the distance from the pol...