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master's thesis
Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis
2024. urn:nbn:hr:181:869498
Kačarik, Draženka
Josip Juraj Strossmayer University of Osijek
Department of biology

Cite this document

Kačarik, D. (2024). Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of biology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:181:869498

Kačarik, Draženka. "Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of biology, 2024. https://urn.nsk.hr/urn:nbn:hr:181:869498

Kačarik, Draženka. "Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of biology, 2024. https://urn.nsk.hr/urn:nbn:hr:181:869498

Kačarik, D. (2024). 'Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of biology, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:181:869498

Kačarik D. Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of biology; 2024 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:181:869498

D. Kačarik, "Učinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of biology, Osijek, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:181:869498

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Metadata
TitleUčinak nedostatka dušika i solnog stresa na rast, biokemijski sastav i fotosintetsku učinkovitost algi Parachlorella kessleri i Desmodesmus communis
Title (english)The effect of N-deficency and salt stress on growth, biochemical composition and photoyntehsis effiency in Parachlorella kessleri i Desmodesmus communis
AuthorDraženka Kačarik
MentorVesna Peršić (mentor)
MentorJasenka Antunović Dunić (komentor)
Committee memberSelma Mlinarić (predsjednik povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of biology
Osijek
Defense date and country2024-09-25, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Biology
Abstract
Različite vrste agi koriste različite strategije prilagodbe stresnim uvjetima. Cilj rada bio je istražiti utjecaj nedostatka dušika (1 % N) i povišenog saliniteta (300× veća koncentracija NaCl od kontrole) na rast, biokemijski sastav i fotosintetsku učinkovitost slatkovodnih zelenih algi Parachlorella kessleri i Desmodesmus communis. Rezultati su pokazali da nedostatak dušika uzrokuje značajno smanjenje fotosintetske učinkovitosti i biomase kod obje vrste algi, dok povišeni salinitet ima manji utjecaj na rast. P. kessleri pokazala je veću sposobnost prilagodbe na stres, uz značajnu akumulaciju škroba u uvjetima nedostatka dušika i aktivaciju cikličkog transporta elektrona oko PSI. S druge strane, D. communis pokazuje veću osjetljivost na nutritivni stres, s izraženijim padom fotosintetske učinkovitosti i akumulacijom lipida u uvjetima povišenog saliniteta. Ovi mehanizmi omogućuju P. kessleri da bolje održava stabilnost primarnih fotokemijskih reakcija, unatoč smanjenju intenziteta fotosinteze, što ukazuje na veću sposobnost preživljavanja nepovoljnih uvjeta kod ove vrste. Rezultati ukazuju na različite adaptacijske strategije dviju algi, što može biti korisno za daljnja istraživanja u kontekstu biotehnološke proizvodnje biomase i biogoriva.
Abstract (english)
Different species of algae use various adaptations stragies under stressful conditions. The objective of this study was to investigate the influence of nitrogen deficiency (1% N) and increased salinity (300× greater NaCl concentration than control) on the growth, biochemical composition, and photosynthetic efficiency of freshwater green algae Parachlorella kessleri and Desmodesmus communis. The results indicated that nitrogen deficiency significantly reduced photosynthetic efficiency and biomass in both algae species. However, increased salinity had a negligible effect on the growth of D. communis. Still, greater sensitivity to nutritional stress was determined, with a more pronounced decrease in photosynthetic efficiency and lipid accumulation under increased salinity conditions. On the other hand, P. kessleri showed a greater ability to adapt to stress, with significant starch accumulation under nitrogen deficiency conditions and by activating cyclic electron transport around PSI, allowing it to maintain the stability of the photosynthetic process despite reduced photosynthesis rate. These results indicate a higher capacity for survival under adverse conditions. Overall, the results suggest different adaptation strategies for the two algae, wich could have potential applications in future biotechnological research for biomass and biofuel production.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:181:869498
Study programmeTitle: Master of Science Graduate University Study Programme in Biology; specializations in: Master of Biology
Course: Master of Biology
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra biologije (magistar/magistra biologije)
Type of resourceText
File originBorn digital
Access conditionsClosed access
Terms of useLicence In copyright icon
Created on2024-10-18 08:22:57