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Descripción
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| Sugarcane (Saccharum officinarum L. and a number of hybrids between this species and S. spontaneumL.) is the most important worldwide source of sugar and one of the most important crops. In a world where sugar and its derivates are consumed in high quantities and with the demand for new fuels decreasing carbon dioxide emissions leading to renewed interest in biofuels, sugarcane appears to be an excellent energy crop, both because of the possibility to obtain automotive ethanol from surplus sugar and because of emerging technologies to transform the cellulosic biomass into ethanol or other fuels. An important strength of this crop, at least in large parts of Brazil, is its capacity to maintained sustained yields with addition of few or no fertilizers. It has long been hypothesized that this is due to the bacterial community inhabiting its rhizosphere and its internal tissues, and this ability may be vital in a world with huge problems with environmental polllutants and widespread lack of essential elements in soil, as these bacteria can revolutionize the way humans ?feed? their crops. As a first step towards isolating plant-growth promoting bacteria from the sugarcane rhizosphere, samples of rhizospheric soil were analysed, and 140 putative rhizobia were isolated, from which 10 strains were selected for further studies of their PGPR abilities. This work focuses on their ability to produce Indole acetic acid or siderophores, to solubilize phosphates and the effect they may have in the root growth and development, as key plantgrowth promoting capabilities. Finally, their draft genome sequences were analyzed to ascertain their phylogenetic position. | |
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Internacional
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