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Planta

, 251:25 | Cite as

Medicago truncatula root developmental changes by growth-promoting microbes isolated from Fabaceae, growing on organic farms, involve cell cycle changes and WOX5 gene expression

  • Ewa KępczyńskaEmail author
  • Piotr Karczyński
Original Article

Abstract

Main conclusion

Both root nodules and the rhizosphere of Fabaceae plants grown on organic farms are a rich source of bacteria, mainly from the families Enterobacteriaceae and Pseudomonadaceae. The enhanced root system growth in M. truncatula after inoculation with selected bacteria includes an increase of nuclei in the cell cycle S phase and a reduction in phase G2 as well as an enhanced expression of the WOX5 gene.

Abstract

Synthetic fertilizers and pesticides are commonly used to improve plant quality and health. However, it is necessary to look for other efficient and also environmentally safe methods. One such method involves the use of bacteria known as plant growth-promoting bacteria (PGPB). Seventy-two bacterial isolates from the rhizospheric soil and root nodule samples of legumes, including bean, alfalfa, lupine and barrel medic, grown on an organic farm in Western Pomerania (Poland) were screened for their growth-promoting capacities and 38 selected isolates were identified based on 16S rRNA gene sequencing. The analysis showed the isolates to represent 17 strains assigned to 6 families: Enterobacteriaceae, Pseudomonadaceae, Xanthomonadaceae, Rhizobiaceae, Bacillaceae and Alcaligenaceae. Pot experiments showed that 13 strains, capable of producing indole compounds from tryptophan in vitro, could significantly enhance the root and shoot weight of 10-week-old Medicago truncatula seedlings. Compared to non-inoculated seedlings, the root system of inoculated ones was more branched; in addition, the root length, surface area and, especially, the root volume were higher. The 24-h root inoculation with the three selected strains increased the nuclei population in the G1 and S phases, decreased it in the G2 phase and enhanced the WUSCHEL-related Homeobox5 (WOX5) gene expression in root tips and lateral zones. The “arrest” of nuclei in the S phase and the enhancement of the WOX5 gene expression were observed to gradually disappear once the bacterial suspension was rinsed off the seedling roots and the roots were transferred to water for further growth. This study shows that the nodules and rhizosphere of legumes grown on organic farms are a rich source of different PGPB species and provides new data on the ability of these bacteria to interfere with cell cycle and gene expression during the root development.

Keywords

16S rRNA identification DNA replication Nodules PGPB traits Plant growth promotion Rhizosphere WOX5 expression 

Abbreviations

PGPB

Plant growth-promoting bacteria

CYCD

Cyclin D

QC

Quiescent center

WOX5

Wuschel-related homeobox5

Notes

Acknowledgements

This work was partially supported by the National Scientific Centre (NCN) Grant no. NN310784140. We would like to express our gratitude to Professor Jan Kępczyński for making the flow cytometer of the Department Plant Physiology and Genetic Engineering available and for reading and commenting on the manuscript draft. We thank Anna Orłowska for her help in WOX gene expression experiment, and Katarzyna Łagowska and Paulina Król for technical assistance in flow cytometry experiment. We are indebted to Teresa Radziejewska for linguistic assistance.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

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Authors and Affiliations

  1. 1.Department of Plant Biotechnology, Faculty of BiologyUniversity of SzczecinSzczecinPoland

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