The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Plant Growth-Promoting Rhizobacteria Stimulate Vegetative Growth and Asexual Reproduction of Kalanchoe daigremontiana

  • Park, Yong-Soon (Molecular Phytobacteriology Laboratory, Superbacteria Research Center, KRIBB) ;
  • Park, Kyungseok (Agricultural Microbiology Division, NAAS, RDA) ;
  • Kloepper, Joseph W. (Department of Entomology and Plant Pathology, Auburn University) ;
  • Ryu, Choong-Min (Molecular Phytobacteriology Laboratory, Superbacteria Research Center, KRIBB)
  • Received : 2015.01.15
  • Accepted : 2015.04.27
  • Published : 2015.09.01
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Abstract

Certain bacterial species associate with plant roots in soil. The plant growth-promoting rhizobacteria (PGPR) stimulate plant growth and yield in greenhouse and field. Here, we examined whether application of known bacilli PGPR strains stimulated growth and asexual reproduction in the succulent plant Kalanchoe daigremontiana. Four PGPR strains B. amyloliquefaciens IN937a, B. cereus BS107, B. pumilus INR7, and B. subtilis GB03 were applied to young plantlets by soil-drenching, and plant growth and development was monitored for three months. Aerial growth was significantly stimulated in PGPR-inoculated plants, which was observed as increases in plant height, shoot weight, and stem width. The stimulated growth influenced plant development by increasing the total number of leaves per plant. Treatment with bacilli also increased the total root biomass compared with that of control plants, and led to a 2-fold increase in asexual reproduction and plantlet formation on the leaf. Collectively, our results firstly demonstrate that Bacillus spp. promote vegetative development of K. daigremontiana, and the enhanced growth stimulates asexual reproduction and plantlet formation.

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References

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