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| Content Provider | Springer Nature Link |
|---|---|
| Author | López Laredo, Alma R. Ramírez Flores, Fanny D. Sepúlveda Jiménez, Gabriela Trejo Tapia, Gabriela |
| Copyright Year | 2009 |
| Abstract | Tecoma stans is a tropical plant from the Americas. Antioxidant activity and both phenolic compound and flavonoid total content were determined for callus tissue of T. stans cultured in either a set photoperiod or in darkness. Callus lines from three explant types (hypocotyls, stem, and leaf) were established on B5 culture medium supplemented with 0.5 μM 2,4-D and 5.0 μM kinetin. While leaf-derived callus grew slower under a 16-h photoperiod (specific growth rate, μ = 0.179 d$^{−1}$, t $_{D}$ = 3.9 d) than in darkness (μ = 0.236 d$^{−1}$, t $_{D}$ = 2.9 d), it accumulated the highest amount (p < 0.05) of both phenolics (86.6 ± 0.01 mg gallic acid equivalents/g) and flavonoids (339.6 ± 0.06 mg catechin equivalents/g). Similarly, antioxidant activity was significantly higher (p < 0.05) when callus was cultured in period light than when grown in extended darkness. Antioxidant activity measured with a 2,20-azinobis (3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS)-based assay was 350.5 ± 15.8 mmol Trolox/g extract for callus cultured under a defined photoperiod compared to 129.1 ± 7.5 mmol Trolox/g extract from callus cultured in darkness. Content of phenolic compounds and flavonoids was in agreement with a better antioxidant power (EC$_{50}$ = 450 μg extract/mg 1,1-diphenyl-2-picrylhydrazyl) and antiradical efficiency. Results of the present study show that calli of T. stans are a source of compounds with antioxidant activity that is favored by culture under a set photoperiod. |
| Starting Page | 550 |
| Ending Page | 558 |
| Page Count | 9 |
| File Format | |
| ISSN | 10545476 |
| Journal | In Vitro Cellular & Developmental Biology - Plant |
| Volume Number | 45 |
| Issue Number | 5 |
| e-ISSN | 14752689 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2009-09-17 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | ABTS Antiradical efficiency Callus culture DPPH Flavonoids Phenolic compounds Tecoma stans Plant Genetics & Genomics Plant Breeding/Biotechnology Developmental Biology Cell Biology Plant Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Developmental Biology Plant Science Biotechnology |
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