Euphorbia milii-endophytic bacteria interactions affect hormonal levels of the native host differently under various airborne pollutants

Journal article

Authors/Editors

CHAIRAT TREESUBSUNTORN

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Publication Details

Author list: Khaksar G., Siswanto D., Treesubsuntorn C., Thiravetyan P.

Publisher: American Phytopathological Society

Publication year: 2016

Journal: Molecular Plant-Microbe Interactions (0894-0282)

Volume number: 29

Issue number: 9

Start page: 663

End page: 673

Number of pages: 11

ISSN: 0894-0282

eISSN: 1943-7706

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990874063&doi=10.1094%2fMPMI-06-16-0117-R&partnerID=40&md5=71f0d257a272ff15ab41b3c9e7f4237c

Languages: English-Great Britain (EN-GB)

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Abstract

This study was conducted to assess the effect of plant-native endophytic bacteria interactions on indole-3-acetic acid (IAA), ethylene levels, and hormonal balance of Euphorbia milii under different airborne pollutants. IAA levels and airborne formaldehyde removal by E. milii enhanced when inoculated with endophytic isolates. However, one isolate, designated as root endophyte 4, with the highest levels of IAA production individually, declined gaseous formaldehyde removal of plant, since it disturbed hormonal balance of E. milii, leading to IAA levels higher than physiological concentrations, which stimulated ethylene biosynthesis and stomatal closure under light conditions. However, plant-root endophyte 4 interactions favored airborne benzene removal, since benzene was more phytotoxic and the plant needed more IAA to protect against benzene phytotoxicity. As trimethylamine (TMA) was not toxic, it did not affect plant-endophyte interactions. Therefore, IAA levels of root endophyte 4-inoculated E. milii was not significantly different from a noninoculated one. Under mixed-pollutant stress (formaldehyde, benzene, TMA), root endophyte 4-inoculated E. milii removed benzene at the lowest rate, since benzene was the most phytotoxic pollutant with the greatest molecular mass. However, TMA (with greater molecular mass) was removed faster than formaldehyde due to higher phytotoxicity of formaldehyde. Plantendophyte interactions were affected differently under various airborne pollutants. ฉ 2016 The American Phytopathological Society.

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