Interaction between Phosphate Solubilizing Bacteria and Arbuscular Mycorrhizal Fungi on Growth Promotion and Tuber Inulin Content of Helianthus tuberosus L

Arbuscular mycorrhizal fungi (AMF) and phosphate solubilizing bacteria (PSB) could interact synergistically because PSB solubilize sparingly available phosphorous compounds into orthophosphate that AMF can absorb and transport to the host plant. Little is known about the interactions between these t...

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Bibliographic Details
Published in:Scientific reports 2020-03, Vol.10 (1), p.4916-4916, Article 4916
Main Authors: Nacoon, Sabaiporn, Jogloy, Sanun, Riddech, Nuntavun, Mongkolthanaruk, Wiyada, Kuyper, Thomas W, Boonlue, Sophon
Format: Article
Language:English
Subjects:
Arbuscular mycorrhizas
Bacteria
Bacteria - metabolism
Fertilizers
Fungi
Helianthus - physiology
Helianthus tuberosus
Host plants
Indoleacetic acid
Inoculation
Inulin
Inulin - metabolism
Mycorrhizae - physiology
Nutrients
Organic acids
Orthophosphate
Phosphate
Phosphates - metabolism
Plant Development
Plant growth
Plant Roots - microbiology
Plant Tubers - metabolism
Soil Microbiology
Solubilization
Symbiosis
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Summary:Arbuscular mycorrhizal fungi (AMF) and phosphate solubilizing bacteria (PSB) could interact synergistically because PSB solubilize sparingly available phosphorous compounds into orthophosphate that AMF can absorb and transport to the host plant. Little is known about the interactions between these two groups in terms of promoting Jerusalem artichoke, Helianthus tuberosus L., which is widely planted by farmers because of its high inulin content. Production depends mainly on synthetic fertilizers as source of plant nutrients. This study aimed to isolate and characterize PSB and investigate the effects of co-inoculation of AMF and PSB on plant performance and inulin accumulation. Isolate UDJA102x89-9, identified as Klebsiella variicola (KV), showed phosphate-solubilizing ability and produced high amounts of several organic acids in vitro and of indole-3-acetic acid (IAA). The experiment combined KV and two AMF species (Glomus multisubtensum (GM) and Rhizophagus intraradices (RI)). Co-inoculation of KV with RI, in combination with rock phosphate, showed the largest increases in plant growth and tuber inulin content, compared both to an unfertilized and fertilized control. This result would reveal whether the phosphate solubilization and IAA property of the PSB in vitro played a significant role in changing plant growth and production, and the available P was subsequently taken up and transported to plant roots by AMF. The high combined effect may have the potential for use by farmers in the future as a biofertilizer for inulin production by Helianthus tuberosus L.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-61846-x