• 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
https://doi.org/10.11606/D.64.2019.tde-20191218-171020
Document
Author
Full name
Rubem Marcondes Ferreira
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1987
Supervisor
Title in Portuguese
Efeito da inoculação do fungo endomicorrízico G. leptotichum na absorção de P, fixação de N2 e crescimento de feijoeiro (Phaseolus vulgaris L.)
Keywords in Portuguese
CRESCIMENTO
FEIJÃO
FIXAÇÃO BIOLÓGICA DE NITROGÊNIO
FÓSFORO
FUNGOS MICORRÍZICOS
INOCULAÇÃO
SIMBIOSE
Abstract in Portuguese
Visando avaliar a influência de um fungo micorrízico vesicular arbuscular (MVA) considerado eficiente no desenvolvimento, na absorção de fósforo e na fixação biológica de nitrogênio atmosférico pelo feijoeiro (Phaseolus vulgaris L.) variedade Carioca, montou-se um experimento em casa de vegetação. Foi utilizado solo hidromórfico, proveniente de várzea, com alto teor de fósforo (53 ppm) e de nitrogênio mineral (36 ppm). Os tratamentos empregados foram: 1) controle (solo fumigado com brometo de metila); 2) solo natural (com fungos MVA nativos); 3) solo fumigado com brometo de metila inoculado com Glomus leptotichum; 4) solo natural inoculado com G. leptotichum. O delineamento experimental usado foi em esquema fatorial 4 x 4 (amostragens x tratamentos), com 6 repetições e inteiramente casualizado. As amostragens foram realizadas aos 24, 35, 44 e 56 dias apos a emergência. Todos os tratamentos foram inoculados com a estirpe C-05II de Rhizobium phaseoli. Em todos os tratamentos o fósforo do solo foi marcado com P-32, visando avaliar se a presença de fungo MVA alteraria a atividade específica do P-32 na planta. Em cada amostragem avaliou-se a atividade de redução de acetileno, o peso da matéria seca, o teor de nitrogênio e fósforo e a atividade do P-32 na parte aérea e nos nódulos. Também procedeu-se à contagem do número de nódulos. As principais conclusões a que se chegou são que a presença de fungos MVA aumentou a fixação biológica de nitrogênio do feijoeiro devido à maior absorção de fósforo pela planta, possibilitando o aumento do número e da massa de nódulos; o estabelecimento de simbiose eficiente Rhizobium x feijoeiro só foi possível devido à presença de fungos MVA; a simbiose tríplice Rhizobium x feijoeiro x fungo MVA favoreceu o desenvolvimento da planta; o G. leptotichum foi mais eficiente na absorção de fósforo do que os fungos MVA nativos.
Title in English
Effect of endomycorrhizal fungus G. leptotichum inoculation on the uptake of P, N2-fixation, and growth of common bean (Phaseolus vulgaris L.)
Abstract in English
A greenhouse experiment was performed to evaluate the influence of an efficient VAM fungus on phosphorus uptake, biological nitrogen fixation, and development of common bean (Phaseolus vulgaris L.) cultivar Carioca. The hydromorphic soil used was collected from an ESALQ "varzea", and a showed high levels of phosphorus (53 ppm) and mineral nitrogen (36 ppm). Treatments included: 1) control (soil fumigated with methylbromide); 2) natural soil (with native VAM fungi); 3) soil fumigated with methylbromide and inoculated with Glomus leptotichum; 4) natural soil inoculated with G. leptotichum. The experimental design used was a 4x4 (samplings x treatments ) factorial, with 6 replicates. Samplings were taken at 24, 35, 44, and 56 days after emergence. All treatments were inoculated with Rhizobium phaseoli, strain C-05II. Soil phosphorus was labelled with P-32 for all treatments, to evaluate the P-32 specific activity in the plants. Acetylene reduction, dry matter weight, nitrogen and phosphorus levels, and P-32 activity in shoots, pods and nodules, were evaluated for each sampling. Number of nodules was also counted. It was concluded that the presence of MVA fungus increased the biological nitrogen fixation of beans due to the higher phosphorus uptake by plant, this leading to an increase in both number and weight of nodules; the establishment of efficient symbiosis Rhizobium x beans was possible only due to the presence of the VAM fungus; the triple symbiosis Rhizobium x beans x VAM fungus favoured plant development; G. leptotichum was more efficient than the native VAM fungi, in phosphorus uptake.
 
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
2019-12-19
 
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 © 2001-2024. All rights reserved.