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Involvement of polar auxin transport in the inhibition of Arabidopsis seedling growth induced by Stenotrophomonas maltophilia

  • Original papers
  • Published:
Biologia Plantarum

Abstract

A wide range of microorganisms found in the rhizhosphere are able to regulate plant growth and development, but little is known about the mechanism by which epiphytic microbes inhibit plant growth. Here, an epiphytic bacteria Stenotrophomonas maltophilia, named as LZMBW216, were isolated and identified from the potato (Solanum tuberosum L. cv. Da Xi Yang) leaf surface. They could decrease primary root elongation and lateral root numbers in Arabidopsis seedlings. The inhibitory effects of LZMBW216 on plant growth were not due to a reduced indole-3-acetic acid (IAA) content, as exogenously applied IAA did not recover the inhibition. Furthermore, LZMBW216 did not affect the expression of DR5::GUS and CycB1;1::GUS. However, we found that LZMBW216 exhibited little effect on the primary root elongation in the pin2 mutant and on the lateral root numbers in the aux1-7 mutant. Moreover, LZMBW216 decreased expressions of AUX1 and PIN2 proteins. Together, these results suggest that root system architecture alterations caused by LZMBW216 may involve polar auxin transport.

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Abbreviations

ACC:

1-aminocyclopropane-1-carboxylic acid

ET:

ethylene

GFP:

green fluorescent protein

IAA:

indole-3-acetic acid

GUS:

ß-glucuronidase

KB:

King’s B medium

MS:

Murashige and Skoog

PCR:

polymerase chain reaction

YFP:

yellow fluorescent protein

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  1. School of Life Sciences, Lanzhou University, Lanzhou, 730000, P.R. China

    J. Wang, Y. Zhang, Y. Li, X. Wang, Z. Liu, C. Zhao, F. Wang & Y. Bi

  2. College of Life Sciences, Chongqing Normal University, Chongqing, 401331, P.R. China

    W. Nan

  3. School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, P.R. China

    J. Ma

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Acknowledgements: This work was supported by the Major State Basic Research Development Program of China (2012CB026105), the National High Technology Research and Development Program (2007AA021401), the National Natural Science Foundation of China (31170225; 31201145), the Foundation of Science and Technology Program of Gansu Province (1107RJYA005), the Scientific research project of Qinghai-Tibetan DC Interconnection Project in State Grid Corporation of China, and the Foundation of Science and Technology Program of Gansu Province (1208RJZA224). The first two authors contributed equally to this work.

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Wang, J., Zhang, Y., Li, Y. et al. Involvement of polar auxin transport in the inhibition of Arabidopsis seedling growth induced by Stenotrophomonas maltophilia . Biol Plant 60, 299–310 (2016). https://doi.org/10.1007/s10535-016-0585-7

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