• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
10.11606/D.11.2016.tde-27062016-104028
Document
Author
Full name
Ana Paula Andrade Braga
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 2016
Supervisor
Committee
Melo, Itamar Soares de (President)
Andreote, Fernando Dini
Kavamura, Vanessa Nessner
Title in Portuguese
Rizobactérias nativas da Caatinga com potencial para redução dos efeitos da seca em soja (Glycine max L.)
Keywords in Portuguese
Caatinga
Estresse hídrico
Mimosa artemisiana
Promoção de crescimento de plantas
Rizobactérias
Abstract in Portuguese
No semiárido brasileiro, a vegetação predominante é a Caatinga, bioma ainda pouco explorado, que apresenta plantas e micro-organismos com alta resistência aos períodos de seca imposto pelo clima. Os micro-organismos associados às plantas deste bioma, são capazes de desenvolver mecanismos de proteção celular contra o estresse hídrico, assim como proteção vegetal contra a dessecação. O presente estudo buscou compreender as rizobactérias associadas a Mimosa artemisiana a fim de selecionar bactérias tolerantes à seca com características de promover o crescimento de plantas sob condições de estresse hídrico, diminuindo assim, os efeitos adversos impostos pela seca. As amostras de solo rizosférico foram coletadas ao longo da Caatinga, englobando os estados da BA e PE, totalizando quatro pontos de coleta. Com o uso de metodologias dependentes de cultivo, foi isolado bactérias com algumas características de promoção de crescimento de plantas diretos e/ou indiretos, como produção de AIA e fixação de nitrogênio. Além disso, linhagens capazes de crescer em meio com reduzida atividade de água e com mecanismos de proteção contra a dessecação, como, produção de EPS, biofilme, produção da ACC deaminase e indução de resistência sistêmica através das enzimas peroxidase e polifenoloxidase. Uma linhagem de Paenibacillus sp. e outra de Bacillus sp. foram capazes de promover o crescimento de soja sob condições de estresse hídrico, aumentando alguns parâmetros vegetais como, parte aérea e sistema radicular analisados.
Title in English
Native of Caatinga rhizobacteria with potential for reducing the adverse effects of drought in soybean (Glycine max L.)
Keywords in English
Caatinga
Mimosa artemisiana
Promotion of growth plants
Rhizobacteria
Water stress
Abstract in English
In the Brazilian semi-arid region, the predominat vegetation is the Caatinga biome, still little explored, which features plants and micro-organisms with high resistance to drought periods imposed by the climate. Microorganisms associated with plants in this biome are able to develop mechanisms of cellular protection agains water stress, as well as vegetable protection agains desiccation. The presente study souught tounderstand the rhizobacteria associated with Mimosa artemisiana in order to select drought-tolerant bactéria with characteristics to promote the growth of plants under water stress conditions, thus reducing adverse effects imposed by drought. Rhizospheric soil samples were collectes along the Caatinga, encompassing the States of Bahia and Pernambuco, totaling four collection points. With the use of farming-dependet methodologies, was isolated bactéria with some features of promotion of growth of direct and/or indirect plants such as AIA production and nitrogen fixation. In addition, able to grow amid strains with reduced water activity and mechanisms of protection against desiccation, such as production of EPS, biofilm, production of ACC deaminase and induction of systemic resistance through peroxidase enzymes and polifenoloxidase. A strain of Paenibacillus sp. and Bacillus sp. were able to promote soybean gowth under water stress conditions, increasing some parameters like vegetables, shoot and root system.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2016-07-15
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2021. All rights reserved.