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Main conclusion <p>The plant growth-promoting rhizobacterium, <i>Pseudomonas putida</i> AKMP7, enhances biomass and yield, while <i>Bacillus endophyticus</i> J13 specifically promotes early flowering, in hydroponically grown rice.</p> Abstract <p>Our laboratory has previously reported the beneficial impacts of free-living, plant-growth-promoting rhizobacteria (PGPR), <i>Pseudomonas putida</i> AKPM7 and <i>Bacillus endophyticus</i> J13 on growth and stress-tolerance in plants (Gopalan et al. <CitationRef CitationID="CR6">2022</CitationRef>, <CitationRef CitationID="CR7">2024</CitationRef>; Nikhil et al. <CitationRef CitationID="CR8">2023</CitationRef>, <CitationRef CitationID="CR9">2024</CitationRef>; Sharma et al. <CitationRef CitationID="CR12">2024</CitationRef>). In this study, we examined the effects of these two rhizobacterial strains on the growth, morphological traits and yield of three rice varieties—IR64, Rc140 (TUBIGAN 6) and IR58025B—grown in a hydroponic set-up. The inoculation of these bacteria significantly enhanced plant growth, biomass, and yield across all three varieties. Plants inoculated with J13 exhibited a significant reduction in the number of days to flowering. Analysis of key flowering genes in the rice plants revealed a substantial increase in <i>Hd3a</i> transcript levels, during the pre-flowering stage, in the inoculated plants. The expression levels of other genes—Rft1, <i>Ghd8</i>, and <i>Ehd1</i>—varied between pre-flowering and post-flowering stages in inoculated versus non-inoculated plants, indicating differential gene expression influenced by J13 inoculation. Our findings suggest that AKMP7 enhances biomass and yield in hydroponically grown rice, while J13 specifically promotes early flowering, offering a potential pathway for PGPR-mediated rapid generation advancement in plants.</p>

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Integrating rhizosphere microbiota into speed breeding: plant growth-promoting rhizobacteria-induced early flowering and yield enhancement in rice

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Ratnadeep Bhattacharjee,
  • Nikhil Padmanabhan Thazath,
  • Karunakaran Maruthachalam,
  • Sridev Mohapatra

摘要

Main conclusion

The plant growth-promoting rhizobacterium, Pseudomonas putida AKMP7, enhances biomass and yield, while Bacillus endophyticus J13 specifically promotes early flowering, in hydroponically grown rice.

Abstract

Our laboratory has previously reported the beneficial impacts of free-living, plant-growth-promoting rhizobacteria (PGPR), Pseudomonas putida AKPM7 and Bacillus endophyticus J13 on growth and stress-tolerance in plants (Gopalan et al. 2022, 2024; Nikhil et al. 2023, 2024; Sharma et al. 2024). In this study, we examined the effects of these two rhizobacterial strains on the growth, morphological traits and yield of three rice varieties—IR64, Rc140 (TUBIGAN 6) and IR58025B—grown in a hydroponic set-up. The inoculation of these bacteria significantly enhanced plant growth, biomass, and yield across all three varieties. Plants inoculated with J13 exhibited a significant reduction in the number of days to flowering. Analysis of key flowering genes in the rice plants revealed a substantial increase in Hd3a transcript levels, during the pre-flowering stage, in the inoculated plants. The expression levels of other genes—Rft1, Ghd8, and Ehd1—varied between pre-flowering and post-flowering stages in inoculated versus non-inoculated plants, indicating differential gene expression influenced by J13 inoculation. Our findings suggest that AKMP7 enhances biomass and yield in hydroponically grown rice, while J13 specifically promotes early flowering, offering a potential pathway for PGPR-mediated rapid generation advancement in plants.