Abstract
The aim of this study was to describe the variability in the root-associated bacterial community due to location and clone, and to determine whether an underlying core bacterial community exists that might benefit the quality of the potato crop. Root-associated bacterial communities from one growing season were examined with 454 sequencing. Variance analysis using perMANOVA attributed 45.4 % and 24.1 % of the community variability to site and clone effects, respectively. A total of 123 bacterial operational taxonomic units were correlated with tuber yield and/or tuber nutrient content, a majority belong to the order Rhizobiales. Rhizobiales bacteria are recognized contributors to crop nitrogen needs for many legumes; however, no known symbiotic relationship between potato roots and nitrogen fixing bacteria exists. Within the Rhizobiales order, the genus Devosia is a major contributor to both the presence/absence core “bacteriome” and the sparse partial least squares core “bacteriome,” thus further exploration into this unknown relationship is warranted.
Resumen
El propósito de este estudio fue describir la variabilidad en la comunidad bacteriana asociada con la raíz debida a ubicación y clon, y determinar si existe una capa interna de comunidad bacteriana que pudiera beneficiar la calidad del cultivo de papa. Se examinaron las comunidades bacterianas asociadas a la raíz de un ciclo de cultivo con 454 secuenciaciones. El análisis de varianza usando perMANOVA atribuyó 45.4 % y 24.1 % de la variabilidad de la comunidad a los efectos de sitio y clon, respectivamente. Se correlacionó a un total de 123 unidades taxonómicas bacterianas operativas con el rendimiento de tubérculo y/o su contenido de nutrientes, la mayoría de las unidades pertenecen al orden Rhizobiales. Se reconoce a estas bacterias su contribución a los requerimientos de nitrógeno del cultivo para muchas leguminosas; no obstante, no se sabe que exista una relación simbiótica entre las raíces de la papa y bacterias fijadoras de nitrógeno. Dentro del orden Rhizobiales, el género Devosia en un contribuyente mayor tanto para la presencia como para la ausencia de la capa de “bacterioma” y los cuadros de capas parcialmente mas dispersos de “bacterioma”, de manera que esta garantizada la exploración adicional al interior de esta relación desconocida.
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Barnett, B.A., Holm, D.G., Koym, J.W. et al. Site and Clone Effects on the Potato Root-Associated Core Microbiome and its Relationship to Tuber Yield and Nutrients. Am. J. Potato Res. 92, 1–9 (2015). https://doi.org/10.1007/s12230-014-9405-9
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DOI: https://doi.org/10.1007/s12230-014-9405-9