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Both incompatible and compatible rhizobia inhabit the intercellular spaces of leguminous root nodules
Hata, Shingo ; Tsuda, Risa ; Kojima, Serina ; Tanaka, Aiko ; Kouchi, Hiroshi
Taylor & Francis 2023
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Título:
Both incompatible and compatible rhizobia inhabit the intercellular spaces of leguminous root nodules
Autor:
Hata, Shingo
;
Tsuda, Risa
;
Kojima, Serina
;
Tanaka, Aiko
;
Kouchi, Hiroshi
Assuntos:
Biochemistry
;
Biotechnology
;
Cancer
;
Cell Biology
;
Developmental Biology
;
Ecology
;
FOS: Biological sciences
;
FOS: Clinical medicine
;
Immunology
;
Microbiology
;
Physiology
;
Plant Biology
;
Space Science
Notas:
RelationTypeNote: IsSupplementTo -- 10.1080/15592324.2023.2245995
10.1080/15592324.2023.2245995
Descrição:
In addition to rhizobia, many types of co-existent bacteria are found in leguminous root nodules, but their habitats are unclear. To investigate this phenomenon, we labeled Bradyrhizobium diazoefficiens USDA122 and Bradyrhizobium sp. SSBR45 with Discosoma sp. red fluorescent protein (DsRed) or enhanced green fluorescent protein (eGFP). USDA122 enhances soybean growth by forming effective root nodules, but SSBR45 does not form any nodules. Using low-magnification laser scanning confocal microscopy, we found that infected cells in the central zone of soybean nodules appeared to be occupied by USDA122. Notably, high-magnification microscopy after co-inoculation of non-fluorescent USDA122 and fluorescence-labeled SSBR45 also revealed that SSBR45 inhabits the intercellular spaces of healthy nodules. More unexpectedly, co-inoculation of eGFP-labeled USDA122 and DsRed-labeled SSBR45 (and vice versa) revealed the presence of USDA122 bacteria in both the symbiosomes of infected cells and in the apoplasts of healthy nodules. We then next inspected nodules formed after a mixed inoculation of differently-labeled USDA122, without SSBR45, and confirmed the inhabitation of the both populations of USDA122 in the intercellular spaces. In contrast, infected cells were occupied by single-labeled USDA122. We also observed Mesorhizobium loti in the intercellular spaces of active wild-type nodules of Lotus japonicus using transmission electron microscopy. Compatible intercellular rhizobia have been described during nodule formation of several legume species and in some mutants, but our evidence suggests that this type of colonization may occur much more commonly in leguminous root nodules.
Editor:
Taylor & Francis
Data de criação/publicação:
2023
Idioma:
Inglês
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