Growth and biochemical characterization of associations between cyanobionts and wheat seedlings in co-culturing experiments |
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Authors: | Anjuli Sood Pawan K Singh Arun Kumar Rajendra Singh Radha Prasanna |
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Institution: | 1.Department of Botany,University of Delhi,Delhi,India;2.Department of Botany,Banaras Hindu University,Varanasi,India;3.National Phytotron Facility,Indian Agricultural Research Institute,New Delhi,India;4.Division of Microbiology,Indian Agricultural Research Institute,New Delhi,India |
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Abstract: | N2-fixing cyanobacteria are unique in their capacity to form symbiotic associations with a wide range of eukaryotic hosts belonging
to different plant groups. The present study was undertaken to analyze the interactions of the cyanobiont PI 01 (from Azolla pinnata) and Nostoc PCC 9229 (from Gunnera monoika) with wheat seedlings, in co-culturing experiments. Each of the cyanobionts enhanced significantly the volume of root and
shoot biomass in the experimental cultures. The transverse sections of roots in the co-cultured seedlings revealed the presence
of aseriate packets of cyanobionts below the root epidermis. The investigated cyanobionts excreted amino acids (His, Met,
Val) and sugars into the medium, while indoleacetic acid was detected when the cyanobionts were grown in a tryptophan containing
medium. During the co-culturing, sugars and proline were detected in the extracellular filtrates. It can be hypothesized that
these sugars and amino acids may serve as signal substances in the development of functional associations between the relevant
cyanobionts and the wheat seedlings. |
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