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Plant Growth Regulation

, Volume 85, Issue 2, pp 231–242 | Cite as

Both epiphytic and endophytic strains of Rhodococcus fascians influence transporter gene expression and cytokinins in infected Pisum sativum L. seedlings

  • Pragatheswari Dhandapani
  • Jiancheng Song
  • Ondrej Novak
  • Paula E. JamesonEmail author
Original paper
  • 192 Downloads

Abstract

Some strains of the soil bacterium Rhodococcus fascians maintain an epiphytic life style while others become endophytic. Virulent, endophytic strains cause multiple shoot growth and inhibit root growth of seed-inoculated Pisum sativum L. We were interested in assessing, at the molecular level, the impact of strains of contrasting niche on the emerging shoots and roots of inoculated seeds. The presence of R. fascians was monitored microscopically, endogenous cytokinin and chlorophyll levels were measured, and the expression of genes monitored by RT-qPCR. The expression of the pea sugar transporter genes (SWEET and SUT), amino acid (AAP) transporters and cell wall invertase gene family members, as well as expression of plant and bacterial cytokinin biosynthesis (IPT), activation (LOG) and degradation (CKX) genes were monitored. Both the virulent strain and the epiphytic strain affected the expression of the transporter genes, with less obvious differences between the strains on the shoot compared with the effect on the root. Strong expression of the R. fascians genes, RfIPT, RfLOG and RfCKX, in pea seedlings at 15 days post inoculation was mirrored by increased expression of transporter gene family members in the plant. However, the elevated levels of isopentenyl adenine-type and zeatin-type cytokinins were not consistently associated with the virulent strain. In conclusion, while both the virulent strain and the epiphytic strain impacted the expression of transporter genes in the shoots and roots, only the virulent strain affected morphology. The inhibited root growth, the greening of the roots, and the expression of the pea response regulators in the infected roots are indicative of a response to cytokinin, but a role for the ‘classical’ cytokinins as virulence determinants was not established.

Keywords

Amino acid transporter Cell wall invertase Cytokinin Pea Rhodococcus fascians Sucrose transporter Sugar Will Eventually be Exported Transporter (SWEET) 

Notes

Acknowledgements

A UC scholarship to PD is gratefully acknowledged. Thanks to Graeme Bull, Jan McKenzie and Neil Andrews for assistance with microscopy, and to the anonymous referees for their constructive comments. O.N. was funded by the Czech Science Foundation (Nr. 17-06613S).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Pragatheswari Dhandapani
    • 1
  • Jiancheng Song
    • 1
    • 2
  • Ondrej Novak
    • 3
  • Paula E. Jameson
    • 1
    Email author
  1. 1.School of Biological SciencesUniversity of CanterburyChristchurchNew Zealand
  2. 2.School of Life SciencesYantai UniversityYantaiChina
  3. 3.Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural ResearchInstitute of Experimental Botany CAS & Faculty of Science of Palacký UniversityOlomoucCzech Republic

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