| Přispěvatelé: |
Caput Mihalić, Katarina, Mičetić Stanković, Vlatka, Urlić, Inga, Mešić, Armin, Kružić, Petar |
| Popis: |
Common duckweed (Lemna minor L.), a small floating macrophyte with a high phytoremediation and bioaccumulation capacity, is characterized by high dry matter yield, cellulose, and starch content. Appropriate manipulation of growing conditions can provide a substantial increase in starch accumulation. Hence, this study aimed to investigate the impact of individual and simultaneous exposure to phytohormone 6- benzylaminopurine (1 μM 6-BA) and increased salinity (50, 100, 150 mM NaCl) on starch and phenolics accumulation, as well as on the antioxidant capacity of common duckweed. After ten days of exposure, increased salinity inhibited duckweed's growth rate and frond size, while 6-BA stimulated it. Simultaneously, the progressive accumulation of starch due to increased salinity was measured and localized on semi-thin microscopic sections in the mesophyll layer. The content of polyphenolic acids (chlorogenic, ferulic, p-coumaric, and syringyl acid), determined by HPLC, differed depending on salinity level. Higher salinity caused a significant decrease in the total phenolic content, indicating salt's negative effect. However, high phenolic content and potent antioxidant activity were observed in the combination of salt and phytohormone. These results suggest an effective tolerance mechanism to increased salinity, making duckweeds an excellent potential feedstock for bioethanol production in moderately saline ecosystems. |
