Enhanced biosynthesis of quercetin occurs as A photoprotective measure in Lycopersicon esculentum mill. under Acute UV-B exposure
Título del documento: Enhanced biosynthesis of quercetin occurs as A photoprotective measure in Lycopersicon esculentum mill. under Acute UV-B exposure
Revista: Brazilian archives of biology and technology
Base de datos: PERIÓDICA
Número de sistema: 000373452
ISSN: 1516-8913
Autors: 1
1
1
1
Institucions: 1Manav Rachna International Universtiy, Faculty of Engineering & Technology, Faridabad. India
Any:
Període: May-Jun
Volum: 57
Número: 3
Paginació: 317-325
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, descriptivo
Resumen en inglés Lycopersicon esculentum respond to UV-B by enhanced synthesis of flavonoid quercetin, a strong antioxidant that helps the plants to well acclimatize to UV-B stress. Three weeks old plants of L. esculentum were subjected to acute UV-B irradiation for 20, 40 and 60 minutes daily until 28 days and analyzed for the morphological and biochemical changes. UV-B exposure for 40 and 60 minutes considerably affected the growth and biomass of L. esculentum. The leaves were deformed, developed chlorosis and abscised early as compared to the unexposed plants. Biomass declined by 35% and total chlorophyll decreased by 24.7% due to disintegration of chloroplasts. Enhancement was seen in the content of carotenoids, anthocyanins and total flavonoids by 15, 33.3 and 22.8%, respectively, which was attributed to the photoprotective role of these compounds as potential quenchers of excess excitation energy. Quercetin content decreased on UV-B exposure to 20 and 40 min, and thereafter increased significantly by 5.19% on 60 min of exposure. This pattern probably indicated that the over-expression of genes involved in its biosynthesis such as phenylalanine ammonia lyase (PAL), chalcone synthase (CHS), flavanone 3-hydroxylase (F3H) and dihydroflavonol 4-reductase (DFR) occurred only after certain threshold exposure (60 min), which could be the strategy for developing tolerance against UV-B stress in L. esculentum
Disciplines Biología,
Agrociencias
Paraules clau: Fisiología vegetal,
Hortalizas,
Estrés fisiológico,
Luz ultravioleta,
Quercetina,
Biosíntesis,
Antocianinas,
Biomasa,
Tomate,
Lycopersicon esculentum
Keyword: Biology,
Agricultural sciences,
Plant physiology,
Vegetables,
Physiological stress,
Ultraviolet light,
Quercetin,
Biosynthesis,
Anthocyanins,
Biomass,
Tomato,
Lycopersicon esculentum
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