Inoculation of plant growth promoting bacteria for Pinus taeda L. seedlings
Keywords:
Bacillus, Dickson Quality Index, planting pit, tree nursery, forestry microbiologyAbstract
Brazil cultivate about one million hectares of Pinus taeda and It has one of the most productive forestry sectors in the world. Several factors contributed to the high productivity of Pinus forests in Brazil, such as plant genetic breeding, improved soil fertility and the development of mechanized plantations. However, the forestry production system may be further improved with the utilization of plant growth promoting bacteria (PGPB). This article reviews the most prominent results of PGPB inoculation in P. taeda seedlings in Brazil, with the objective of offering a recommendation for a viable technology to promote growth and produce more vigorous seedlings. Inoculation of PGPB may be realized in seeds, in substrate, by irrigation, and by spraying, either in the seedling tubes or in the field pits. Experiments performed in Brazil showed that application of about 12 x106 CFU of bacterial cells per gram of substrate is suitable to stimulate seedling growth and to increase the seedling indicator called Dickson Quality Index (DQI). Furthermore, inoculation of PGPB may contribute to biological control of plagues and diseases. In conclusion, the review highlighted that inoculation of PGPB in nursery may produce bigger and more vigorous P. taeda seedlings for field transplantation; however, it also revealed that forestry microbiology has a long way to pursue because there is only few options of inoculants available for the silviculture.
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Copyright (c) 2021 Yanka Rocha Kondo; Glaciela Kaschuk; Sonia Purin da Cruz
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