Mutual interference of phosphorus starvation and diazotrophy in the cyanobacteria Nostoc sp. PCC 7120

Gorelova, O.A.; Karpova, O.V.; Baulina, O.I.; Semenova, L.R.; Scherbakov, P.N.; Chivkunova, O.B.; Selyakh, I.O.; Vasilieva, S.G.; Lobakova, E.S.; Solovchenko, A.E.

Авторы: Gorelova O.A., Karpova O.V., Baulina O.I., Semenova L.R., Scherbakov P.N., Chivkunova O.B., Selyakh I.O., Vasilieva S.G., Lobakova E.S., Solovchenko A.E.
Журнал: Protoplasma
Год издания: 2025
Издательство: Springer Verlag
Местоположение издательства: Germany
DOI: 10.1007/s00709-025-02133-2
Аннотация: The generalized response of the cyanobacterium Nostoc sp. PCC 7120 to and its recovery from phosphorus (P) starvationstress differ drastically under diazotrophic and non-diazotrophic growth modes. In nitrogen (N) -replete medium, Nostocsp. PCC 7120 cells were resilient even to prolonged P starvation when its growth was supported by mobilization of cellularreserves of P (polyphosphate) and glycogen on the background of accumulation of nitrogen and carbon reserves (mainlycyanophycin). The P-starving cells quickly recovered upon re-feeding with inorganic phosphate (Pi). Under diazotrophicconditions, P-starvation essentially diminished the fixation of dinitrogen. As a result, most of the vegetative cells comprising the trichomes of the cyanobacterium died and decomposed while other cells retained their structural integrity butdid not divide. In turn, the latter fell into two categories: some of them showed signs of nutrient starvation; while theother became dormant but did not display the signs of starvation. They resembled neither akinete nor chlorotic cells butwere similar to arthrospores lacking a thickened sheath. Re-feeding with Pi triggered a quick resuscitation of the dormantvegetative cells manifested by mobilization of their internal reserves, resumption of the cell growth and division. Theseprocesses took place faster than the formation of heterocytes with well-developed envelope (thus, nitrogenase activityrecovered by the 7th day after re-feeding of the cells with Pi). The results provide a deeper insight into the mechanismsof stress tolerance in Nostoc sp. PCC 7120 and modulation of the cyanobacterial productivity in natural ecosystems andartificial cultivation facilities by nitrogen and P availability
Добавил в систему: Соловченко Алексей Евгеньевич

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Mutual interference of phosphorus starvation and diazotrophy in the cyanobacteria Nostoc sp. PCC 7120статья Исследовательская статья

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