Abstract
Guarana (Paullinia cupana var. Sorbilis (Mart.) Ducke) is a species native from Amazon which has high caffeine concentration. The interactions between guarana and microorganisms in Amazonian soils need to be investigated, especially in relation to the seedling production process, due to its beneficial relationships such as biosynthesis and the supply of stimulating substances, which may result in shortening of the nursery garden or increased productivity. Thus, this research had the objective of evaluating the potential of growth caused by rhizobacteria (Burkholderia ambifaria and Bacillus sp.) in rooting of guarana seedlings. The root length, volume, dry matter of the aerial part, height, number of leaves, leaf area and dry matter of shoot were evaluated at 180 days after planting emergence. Were also determined the carbohydrate and proline content of the aerial part. The rhizobacteria did not influence the growth of the seedlings, however, the carbohydrate contents were higher when the inoculation of the rhizobacteria was carried out with the Burkholderia ambifaria bacteria in the cultivar BRS-Amazonas, with the best results. The proline levels were higher in the control treatment of the two cultivars.
Highlights
The rhizobacteria used were Burkholderia ambifaria and Bacillus sp., as identified by Batista (2013) and assigned by the Biotechnology Laboratory of the Biological Sciences Institute (UFAM), and they were isolated from the guarana roots of Farm Santa Helena, Maués, Amazonas, Brazil
Regardless of the interaction, the rhizobacteria had no beneficial effect on the variables, shoot dry matter, root dry matter, total dry matter, root diameter and leaf area, presenting lower mean values in relation to the control treatment
There was no significant difference in relation to the evaluated characteristics (Table 1)
Summary
Plant growth promoting rhizobacteria (RPCP) are found in free life in the soil and can be associated with some plants, promoting benefits to it. These benefits are related to the biosynthesis and supply of growth-stimulating substances essential in various physiological aspects. Among these growth-promoting substances, auxins stand out as the main and most responsive stimulators (Galdiano, 2009). This research has the objective of evaluating the potential of growth promoting rhizobacteria in the rooting of guarana seedlings
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