Differential response to P-stress on the growth, phosphomonoesterase activity and organic phosphate mobilisation in diazotrophic cyanobacteria

Pandey, M. (2006) Differential response to P-stress on the growth, phosphomonoesterase activity and organic phosphate mobilisation in diazotrophic cyanobacteria. Acta Botanica Hungarica, 48 (1-2). pp. 103-118. ISSN 0236-6495

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Abstract

The diazotrophic heterocystous cyanobacterial strains of four different taxonomic groups were able to grow under inorganic-P-limited (P-stress) condition with a little cell biomass, which was supported by the stored polyphosphate granules. Nitrate-N could support the growth of all the strains under P-limitation, which acted as an important nutrient, and an able support to overcome P-stress. All the strains under P-limitation synthesised the phosphomonoesterase enzyme and the resultant activity differs among the strains. Almost all the cyanobacteria investigated showed potential to mobilise organic-P substrates such as p-nitrophenyl phosphate (p-NPP), glucose-6-phosphate (G-6-P) andb-glycero phosphate (Gly-P) as evident in the diminishing PMEase activity and growth. Among the strains, Calothrix brevissima and Anabaena flos-aquae behaved as a novel organism to survive under P-stress and solubilise organic-P substrates.

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