UNIVERSIDAD DE BUENOS AIRES FACULTAD DE FARMACIA Y BIOQUÍMICA ...
In a scenario of water deficit the use of bacteria resistant to osmotic stress would be beneficial to achieve a better response of plants to stress. Thus, selection of more tolerant bacteria could be useful to design new inoculants to be used in arid zones. In this sense, a group of Azospirillum iso...
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| Formato: | Tesis doctoral acceptedVersion |
| Lenguaje: | Español |
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Facultad de Farmacia y Bioquímica
2018
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| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_7185 http://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_7185.dir/7185.PDF |
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| Sumario: | In a scenario of water deficit the use of bacteria resistant to osmotic stress would be beneficial to achieve a better response of plants to stress. Thus, selection of more tolerant bacteria could be useful to design new inoculants to be used in arid zones. In this sense, a group of Azospirillum isolates deposited in INTA collection was characterized. The results obtained demonstrated that Az19 strain has similar in vitro PGPR properties to Az39, the most used strain for inoculants industries in Argentina, with the advantage of a better tolerance to osmotic and salt stress, which could be related to the greater trehalose accumulation produced by this strain. Inoculation of maize plants with Az19 resulted in a better response against water deficit compared to Az39 strain. However, trials with a recombinant strain with a reduced content of trehalose demonstrated that this metabolite would not be the responsible for the improvement of plant tolerance to hydric stress. The results obtained encourage us to further study the behavior of this strain in greenhouse and field trials in view of developing new inoculants suitable for areas with water deficit. |
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