Genetic relationships among Italian and Mexican maize-rhizosphere Burkholderia cepacia complex BCC populations belonging to Burkholderia cenocepaciaIIIB and BCC6 groupReportar como inadecuado




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BMC Microbiology

, 11:228

Ecological and evolutionary microbiology

Abstract

BackgroundA close association between maize roots and Burkholderia cepacia complex BCC bacteria has been observed in different locations globally. In this study we investigated by MultiLocus Restriction Typing MLRT the genetic diversity and relationships among Burkholderia cenocepacia IIIB and BCC6 populations associated with roots of maize plants cultivated in geographically distant countries Italy and Mexico, in order to provide new insights into their population structure, evolution and ecology.

ResultsThe 31 B. cenocepacia IIIB and 65 BCC6 isolates gave rise to 29 and 39 different restriction types RTs, respectively. Two pairs of isolates of B. cenocepacia IIIB and BCC6, recovered from both Italian and Mexican maize rhizospheres, were found to share the same RT. The eBURST Based Upon Related Sequence Types analysis of MLRT data grouped all the B. cenocepacia IIIB isolates into four clonal complexes, with the RT-4-complex including the 42% of them, while the majority of the BCC6 isolates 94% were grouped into the RT-104-complex. These two main clonal complexes included RTs shared by both Italian and Mexican maize rhizospheres and a clear relationship between grouping and maize variety was also found. Grouping established by eBURST correlated well with the assessment using unweighted-pair group method with arithmetic mean UPGMA. The standardized index of association values obtained in both B. cenocepacia IIIB and BCC6 suggests an epidemic population structure in which occasional clones emerge and spread.

ConclusionsTaken together our data demonstrate a wide dispersal of certain B. cenocepacia IIIB and BCC6 isolates in Mexican and Italian maize rhizospheres. Despite the clear relationship found between the geographic origin of isolates and grouping, identical RTs and closely related isolates were observed in geographically distant regions. Ecological factors and selective pressure may preferably promote some genotypes within each local microbial population, favouring the spread of a single clone above the rest of the recombinant population.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2180-11-228 contains supplementary material, which is available to authorized users.

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Autor: Annamaria Bevivino - Barbara Costa - Cristina Cantale - Silvia Cesarini - Luigi Chiarini - Silvia Tabacchioni - Jesus Cabal

Fuente: https://link.springer.com/article/10.1186/1471-2180-11-228







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