Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth

Bibliographic Details
Main Author: Cosme, Marco Paulo Rebeca
Publication Date: 2010
Format: Master thesis
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10400.5/15193
Summary: Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
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network_name_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
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spelling Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growthNicotiana tabacumGlomus intraradicesPseudomonas fluorescensroot morphologycytokininphosphorousMestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de AgronomiaA rizosfera é uma zona importante em termos de actividade e diversidade microbiana, onde ocorrem associações benéficas entre plantas e microorganismos, e é fundamental na produção agrícola. Ao proliferarem num meio complexo e heterogéneo como o solo, as raízes desenvolvem-se de forma estruturada, mas flexível, por forma a optimizar suas funções. Factores endógenos, como fisiologia e genética da planta, bem como factores exógenos abióticos e bióticos são elementos determinantes. Neste estudo proponho testar a hipótese de que os efeitos dos microorganismos do solo sobre o crescimento da planta estão associados a efeitos sobre a morfologia radicular e dependentes dos níveis endógenos de fitohormonas e disponibilidade de nutrientes no solo. Uma experiência factorial foi instalada na estufa, com a presença ou ausência de Glomus intraradices ou Pseudomonas fluorescens, com dois regimes de fertilização de fósforo, e com a linhagem selvagem de tabaco (Nicotiana tabacum) ou a transgénica 35S:CKX2 com teor de citoquinina reduzido. Os efeitos dos microorganismos sobre a biomassa alternaram entre o negativo, neutro ou positivo, dependendo da linhagem, do regime de fertilização e a presença de microorganismos, e explicam-se parcialmente com alterações na morfologia da raiz. A micorrização aumentou na linhagem 35S:CKX2 ou em presença de P. fluorescens-------------------------------------------------ABSTRACT - The rhizosphere is an important zone for microbial activity and diversity, where several beneficial associations between roots and microorganism occur, and is fundamental in terms of defining terrestrial food production. When growing in a complex and heterogeneous medium such as soil, roots develop in a structured but flexible manner to optimize their functions. Endogenous factor, such as plant physiology and genetics, as well as abiotic and biotic exogenous factors are important determinants. In the present study I hypothesized that the effects of soil microorganisms on root morphology are associated with plant growth and differ depending on endogenous phytohormone levels and soil nutrient availability. A full factorial experiment was set up in the greenhouse, with presence or absence of Glomus intraradices or Pseudomonas fluorescens, with two phosphorus amendments, and with the tobacco wild type (Nicotiana tabacum) or the 35S:CKX2 transgenic line with reduced cytokinin content. The effects of microorganisms on plant biomass changed from negative to neutral and positive depending on plant type, phosphorus amendment and microorganism presence, and are partially explained by alteration on root morphology. Mycorrhization was enhanced in the 35S:CKX2 mutant or in presence of P. fluorescensISAWurst, SusannePereira, João SantosRepositório da Universidade de LisboaCosme, Marco Paulo Rebeca2018-04-03T13:07:59Z20102010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/15193engCosme, M.P.R. - Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth. Lisboa: ISA, 2010, 58 p.info:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T16:07:48Zoai:repositorio.ulisboa.pt:10400.5/15193Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T04:03:40.776596Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
title Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
spellingShingle Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
Cosme, Marco Paulo Rebeca
Nicotiana tabacum
Glomus intraradices
Pseudomonas fluorescens
root morphology
cytokinin
phosphorous
title_short Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
title_full Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
title_fullStr Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
title_full_unstemmed Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
title_sort Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth
author Cosme, Marco Paulo Rebeca
author_facet Cosme, Marco Paulo Rebeca
author_role author
dc.contributor.none.fl_str_mv Wurst, Susanne
Pereira, João Santos
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Cosme, Marco Paulo Rebeca
dc.subject.por.fl_str_mv Nicotiana tabacum
Glomus intraradices
Pseudomonas fluorescens
root morphology
cytokinin
phosphorous
topic Nicotiana tabacum
Glomus intraradices
Pseudomonas fluorescens
root morphology
cytokinin
phosphorous
description Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01T00:00:00Z
2018-04-03T13:07:59Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/15193
url http://hdl.handle.net/10400.5/15193
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Cosme, M.P.R. - Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth. Lisboa: ISA, 2010, 58 p.
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ISA
publisher.none.fl_str_mv ISA
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
_version_ 1833601927986806784

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