Haloadaptative responses of Aspergillus sydowii to extreme water deprivation : morphology, compatible solutes, and oxidative stress at NaCl saturation

Jiménez-Gómez, Irina (avtor), Valdés-Muñoz, Gisell (avtor), Moreno-Perlín, Tonatiuh (avtor), Mouriño-Pérez, Rosa R. (avtor), Rayo Sánchez-Carbente, María del (avtor), Folch-Mallol, Jorge Luis (avtor), Pérez-Llano, Yordanis (avtor), Gunde-Cimerman, Nina (avtor), C. Sánchez, Nilda del (avtor), Batista-García, Ramón Alberto (avtor)

Water activity (a$_w$) is critical for microbial growth, as it is severely restricted at a$_w$ < 0.90. Saturating NaCl concentrations (~5.0 M) induce extreme water deprivation (aw ≅ 0.75) and cellular stress responses. Halophilic fungi have cellular adaptations that enable osmotic balance and ionic/oxidative stress prevention to grow at high salinity. Here we studied the morphology, osmolyte synthesis, and oxidative stress defenses of the halophile Aspergillus sydowii EXF-12860 at 1.0 M and 5.13 M NaCl. Colony growth, pigmentation, exudate, and spore production were inhibited at NaCl-saturated media. Additionally, hyphae showed unpolarized growth, lower diameter, and increased septation, multicellularity and branching compared to optimal NaCl concentration. Trehalose, mannitol, arabitol, erythritol, and glycerol were produced in the presence of both 1.0 M and 5.13 M NaCl. Exposing A. sydowii cells to 5.13 M NaCl resulted in oxidative stress evidenced by an increase in antioxidant enzymes and lipid peroxidation biomarkers. Also, genes involved in cellular antioxidant defense systems were upregulated. This is the most comprehensive study that investigates the micromorphology and the adaptative cellular response of different non-enzymatic and enzymatic oxidative stress biomarkers in halophilic filamentous fungi.

• Jezik: Angleški jezik
• Ključne besede: Aspergillus sydowii, halophily, extremophilic fungi, saline stress, saturated NaCl solution, water deprivation, oxidative stress, morphology
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2020
• Št. strani: 20 str.
• Številčenje: Vol. 6, iss. 4, art. 316
• PID: 20.500.12556/RUL-134689
• UDK: 577
• ISSN pri članku: 2309-608X
• DOI: 10.3390/jof6040316
• COBISS.SI-ID: 46917379
• Datum objave v RUL: 26.01.2022

Gradivo je del revije

• Naslov: Journal of Fungi
• Skrajšan naslov: J. Fungi
• Založnik: MDPI
• ISSN: 2309-608X
• COBISS.SI-ID: 525300761

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 01.12.2020

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: biokemija, glive, oksidativni stres, morfologija