Fluorescence in situ hybridization reveals endophytic and epiphytic root colonization of the novel plant growth-promoting bacterium Citrobacter sedlakii CESi7

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ID: 333713
2026
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Abstract
Abstract Plant growth-promoting bacteria are gaining significant attention as promising biofertilizers. However, the inconsistency between in vitro plant growth-promoting traits and actual field performance remains a challenge, driven partly by a limited understanding of in situ colonization. This study characterized the colonization patterns of Citrobacter sedlakii CESi7, a novel plant growth-promoting bacterium, isolated from oil palm waste compost, during Brassica rapa cultivation. The in situ behavior of CESi7 was observed in both sterilized medium and non-sterilized soil using fluorescence in situ hybridization with a strain-targeting probe. The results revealed that CESi7 can establish both epiphytic and endophytic populations that transiently colonize roots. In a sterilized medium, CESi7 was widely distributed throughout the root tissues. Conversely, in non-sterilized soil, the bacterium formed dense aggregates specifically at the root tips. This study provides direct microscopic evidence of the colonization strategy of CESi7, offering crucial insights for its development as an effective biofertilizer.
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openalex_W7223415091 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Hiromu Inoue, Manami Maeda, Tomonori Koga, Zahra Salman, Clament Fui Seung Chin, Mohd Huzairi Mohd Zainudin, Norhayati Ramli, M. S. Hassan, Yukihiro Tashiro, Kenji Sakai
Journal bioscience biotechnology and biochemistry
Year 2026
DOI
10.1093/bbb/zbag158
URL
https://doi.org/10.1093/bbb/zbag158
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