TY - JOUR
T1 - Comparison of metabolite levels in callus of Tecoma stans (L.) Juss. ex Kunth. cultured in photoperiod and darkness
AU - López-Laredo, Alma R.
AU - Ramírez-Flores, Fanny D.
AU - Sepúlveda-Jiménez, Gabriela
AU - Trejo-Tapia, Gabriela
N1 - Funding Information:
Acknowledgments This study was funded by the Secretaría de Investigación y Posgrado del IPN (SIP-IPN, Grants 20070118 and 20080101) and by Fondo Mixto de Fomento a la Investigación Científica y Tecnológica CONACYT-Gobierno del Estado de Morelos (MOR-2007-C01-79409). A. R. López-Laredo, G. Sepúlveda-Jiménez, and G. Trejo-Tapia are grateful to SIBE and EDI (IPN).
PY - 2009/10
Y1 - 2009/10
N2 - 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, tD = 3.9 d) than in darkness (μ = 0.236 d-1, tD = 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 (EC50 = 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.
AB - 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, tD = 3.9 d) than in darkness (μ = 0.236 d-1, tD = 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 (EC50 = 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.
KW - ABTS
KW - Antiradical efficiency
KW - Callus culture
KW - DPPH
KW - Flavonoids
KW - Phenolic compounds
KW - Tecoma stans
UR - http://www.scopus.com/inward/record.url?scp=70449518969&partnerID=8YFLogxK
U2 - 10.1007/s11627-009-9250-6
DO - 10.1007/s11627-009-9250-6
M3 - Artículo
SN - 1054-5476
VL - 45
SP - 550
EP - 558
JO - In Vitro Cellular and Developmental Biology - Plant
JF - In Vitro Cellular and Developmental Biology - Plant
IS - 5
ER -