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<p>Plant growth-promoting rhizobacteria (PGPR) are an environmentally friendly biostimulant suitable for sustainable grassland management. This study investigated the effects of a native rhizobacterial strain on the growth of cocksfoot (<i>Dactylis glomerata</i> L.). A native rhizobacterial strain -<i>Raoultella</i> sp. KUP47 was applied to stimulate the growth of <i>D. glomerata</i>. Morphological traits and photosynthetic pigments were measured after each harvest. After two years, bacterial community composition was analyzed using Illumina sequencing. The selected isolate showed high indole-3-acetic acid production and phosphate-solubilizing ability. After 52 days in a growth chamber, plants treated with PGPR showed a significant increase in root length and in chlorophyll a, chlorophyll b, and carotenoid content compared to the control. In the first year of the pot experiment, inoculation with <i>Raoultella</i> sp. KUP47 generally improved shoot length and biomass, although differences were not always significant. In the second year, the effects of inoculation on shoot growth were mostly insignificant. A single inoculation with KUP47 significantly increased chlorophyll a, total chlorophyll, and carotenoid content at the first swath of the first year. Inoculation did not significantly affect alpha-diversity, but a higher abundance of the phylum Verrucomicrobiota was observed in soil inoculated twice per year. At the genus level, significantly more <i>Chthoniobacter</i> taxa (Verrucomicrobiota) were found in doubly inoculated soil than in the control. <i>Raoultella</i> sp. KUP47 shows potential as a plant growth promoter for cocksfoot grasslands, though field trials are required to confirm its effectiveness.</p>

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Raoultella sp. KUP47 Promotes Dactylis Glomerata L. Growth and Enriches Verrucomicrobiota in the Rhizosphere

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Jakub Dobrzyński,
  • Iryna Kulkova,
  • Zuzanna Jakubowska,
  • Aleksandra Naziębło,
  • Dorota Gryszkiewicz-Zalega,
  • Jacek Sosnowski,
  • Jerzy Barszczewski,
  • Barbara Wróbel

摘要

Plant growth-promoting rhizobacteria (PGPR) are an environmentally friendly biostimulant suitable for sustainable grassland management. This study investigated the effects of a native rhizobacterial strain on the growth of cocksfoot (Dactylis glomerata L.). A native rhizobacterial strain -Raoultella sp. KUP47 was applied to stimulate the growth of D. glomerata. Morphological traits and photosynthetic pigments were measured after each harvest. After two years, bacterial community composition was analyzed using Illumina sequencing. The selected isolate showed high indole-3-acetic acid production and phosphate-solubilizing ability. After 52 days in a growth chamber, plants treated with PGPR showed a significant increase in root length and in chlorophyll a, chlorophyll b, and carotenoid content compared to the control. In the first year of the pot experiment, inoculation with Raoultella sp. KUP47 generally improved shoot length and biomass, although differences were not always significant. In the second year, the effects of inoculation on shoot growth were mostly insignificant. A single inoculation with KUP47 significantly increased chlorophyll a, total chlorophyll, and carotenoid content at the first swath of the first year. Inoculation did not significantly affect alpha-diversity, but a higher abundance of the phylum Verrucomicrobiota was observed in soil inoculated twice per year. At the genus level, significantly more Chthoniobacter taxa (Verrucomicrobiota) were found in doubly inoculated soil than in the control. Raoultella sp. KUP47 shows potential as a plant growth promoter for cocksfoot grasslands, though field trials are required to confirm its effectiveness.