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Osmoprotective functions conferred to soybean plants via inoculation with Sphingomonas sp. LK11 and exogenous trehalose
School of Applied Biosciences, Kyungpook National University, Daegu 41566, Republic of Korea.ORCID iD: 0000-0002-7072-451x
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2017 (English)In: Microbiology Research, ISSN 0944-5013, E-ISSN 1618-0623, Vol. 205, p. 135-145Article in journal (Refereed) Published
Abstract [en]

Osmotic stress induced by drought can hinder the growth and yield of crop plants. To understand the eco-physiological role of osmoprotectants, the combined utilization of endophytes and osmolytes (trehalose) can be an ideal strategy used to overcome the adverse effects of drought. Hence, in the present study, we aimed to investigate the role of Sphingomonas sp. LK11, which produces phytohormones and synthesizes trehalose, in improving soybean plant growth under drought-induced osmotic stress (−0.4, −0.9, and −1.2 MPa). The results showed that the inoculation of soybean plants with Sphingomonas sp. LK11 significantly increased plant length, dry biomass, photosynthetic pigments, glutathione, amino acids (proline, glycine, and glutamate), and primary sugars as compared to control plants under varying drought stresses. Trehalose applied to the plant with or without endophyte-inoculation also showed similar plant growth-promoting attributes under stress. Stress exposure significantly enhanced endogenous jasmonic (JA) and abscisic (ABA) acid contents in control plants. In contrast, Sphingomonas sp. LK11-inoculation significantly lowered ABA and JA levels in soybean plants, but these phytohormones increased in response to combined treatments during stress. The drought-induced osmotic stress resistance associated with Sphingomonas sp. LK11 and trehalose was also evidenced by increased mRNA gene expression of soybean dehydration responsive element binding protein (DREB)-type transcription factors (GmDREBa and GmDREB2) and the MYB (myeloblastosis) transcription factor (GmMYBJ1) as compared to the control. In conclusion, our findings demonstrated that inoculation with this endophyte and trehalose improved the negative effects of drought-induced osmotic stress, and it enhanced soybean plant growth and tolerance.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 205, p. 135-145
Keywords [en]
Osmotic stress, Plant–microbe interaction, Endophytic bacteria, Soybean, Exogenous trehalose
National Category
Plant Biotechnology
Identifiers
URN: urn:nbn:se:umu:diva-176697DOI: 10.1016/j.micres.2017.08.009ISI: 000412962800017PubMedID: 28942839OAI: oai:DiVA.org:umu-176697DiVA, id: diva2:1500955
Available from: 2020-11-14 Created: 2020-11-14 Last updated: 2020-11-16Bibliographically approved

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Imran, Qari Muhammad

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