UPA Perpustakaan Universitas Jember

The benefits of foliar inoculation with Azospirillum brasilense in soybean are explained by an auxin signaling model

Mariana L. Puente 1 - Personal Name
José L. Gualpa 2 - Personal Name
Gastón A. Lopez 2 - Personal Name
Romina M. Molina 2 - Personal Name
Mariana L. Puente 1 & José L. GuSusana M. Carletti 3 - Personal Name
Fabricio D. Cassán 2 - Personal Name

Azospirillum sp. is one of the most studied genera of plant growth-promoting rhizobacteria (PGPR). The ability of Azospirillum sp. to
promote plant growth has been associated with its ability to produce several phytohormones, such as auxins, gibberellins and
cytokinins, but mainly indole-3-acetic acid (IAA). It has been propoosed that the production of IAA explains the positive effects of
co-inoculation with Azospirillum sp. on the rhizobia-legume symbiosis. In this study, we constructed an IAA-deficient mutant of
A. brasilense Az39 (ipdC − ) by using a restriction-free cloning method. We inoculated soybean seeds with 1·10 6 cfu·seed −1 of
Bradyrhizobium japonicum E109 and co-inoculating leaves at the V3 stage with 1·10 8 cfu.plant −1 of A. brasilense Az39 wt or
ipdC − or inoculated leaves with 20 μg.plant −1 synthetic IAA. The results confirmed soybean growth promotion as there was increased
total plant and root length, aerial and root dry weight, number of nodules on the primary root, and an increase in the symbiosis
established with B. japonicum E109. Nodule weight also increased after foliar co-inoculation with the IAA- producer A. brasilense
Az39. The exogenous application of IAA decreased aerial and root length, as well as the number of nodules on primary roots in
comparison with the Az39 wt strain. These results allow us to propose a biological model of response to foliar co-inoculation of
soybean with IAA-producing rhizobacteria. This model clearly shows that both the presence of microorganism as part of the coloni-
zation process and the production of IAA in situ are co-responsible, via plant signaling molecules, for the positive effects on plant
growth and symbiosis establishment.

EB00000002616K Available

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Azospirillum
Indole-3-acetic acid
Soybean
AzospiriFoliar inoculation
Bradyrhizobium

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The benefits of foliar inoculation with Azospirillum brasilense in soybean are explained by an auxin signaling model

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The benefits of foliar inoculation with Azospirillum brasilense in soybean are explained by an auxin signaling model

Mariana L. Puente 1 - Personal NameJosé L. Gualpa 2 - Personal NameGastón A. Lopez 2 - Personal NameRomina M. Molina 2 - Personal NameMariana L. Puente 1 & José L. GuSusana M. Carletti 3 - Personal NameFabricio D. Cassán 2 - Personal Name

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Mariana L. Puente 1 - Personal Name
José L. Gualpa 2 - Personal Name
Gastón A. Lopez 2 - Personal Name
Romina M. Molina 2 - Personal Name
Mariana L. Puente 1 & José L. GuSusana M. Carletti 3 - Personal Name
Fabricio D. Cassán 2 - Personal Name