Mineral phosphate solubilization by Streptomyces sp. CTM396 involves the excretion of gluconic acid and is stimulated by humic acids

FEMS Microbiology Letters
Mounira Ben FarhatHichem Chouayekh

Abstract

The actinomycetes isolates (128) which were taken from agricultural soil samples and collected near a rock phosphate processing unit were screened for mineral phosphate-solubilizing (MPS) ability. A significant MPS activity was observed for 30 isolates on various phosphate sources when grown in the National Botanical Research Institute's phosphate broth. CTM396 and CTM397 strains which showed the highest MPS abilities were identified by 16S rDNA sequencing as members of the genus Streptomyces. Their MPS activity was proved to be concomitant with a drop in pH due to the secretion of gluconic acid (GA). This was correlated with the simultaneous detection by PCR of genes gdh [encoding the glucose dehydrogenase (GDH) responsible for GA production from glucose] and pqq (involved in biosynthesis of the pyrroloquinoline quinone cofactor of GDH), as well as the highlighting of GHD enzyme activity, for the first time in a Streptomyces sp. strain producing GA. Furthermore, the 0.05% of humic acids proved to have a stimulatory effect on the growth and the ability of CTM396 to solubilize Gafsa rock phosphate. According to this study, it is possible to use humic acids and Gafsa rock phosphate in association with spores of ad hoc Streptomyce...Continue Reading

References

Aug 5, 2003·Uchū Seibutsu Kagaku·Francisco A MaciasJose M Molinillo
Apr 19, 2006·Biotechnology and Bioengineering·Chiu-Chung YoungA B Arun
Jan 28, 2012·Indian Journal of Microbiology·Mahesh S YandigeriSunil Pabbi
Jan 5, 2013·Current Microbiology·Syed G Dastager, Samir Damare

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Citations

Jun 21, 2020·World Journal of Microbiology & Biotechnology·Burak AlaylarNaveen Kumar Arora
Jan 11, 2019·Applied Microbiology and Biotechnology·Carlos Barreiro, Miriam Martínez-Castro
May 11, 2021·Frontiers in Bioengineering and Biotechnology·Harold Alexander Vargas HoyosItamar Soares Melo
Jul 22, 2021·Biological Reviews of the Cambridge Philosophical Society·Jin-Tian LiJie-Liang Liang
Jul 6, 2021·Physical Chemistry Chemical Physics : PCCP·Mariya P SanduIrina A Kurzina

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