Enhanced biosynthesis of quercetin occurs as A photoprotective measure in Lycopersicon esculentum mill. under Acute UV-B exposure
Document title: Enhanced biosynthesis of quercetin occurs as A photoprotective measure in Lycopersicon esculentum mill. under Acute UV-B exposure
Journal: Brazilian archives of biology and technology
Database: PERIÓDICA
System number: 000373452
ISSN: 1516-8913
Authors: 1
1
1
1
Institutions: 1Manav Rachna International Universtiy, Faculty of Engineering & Technology, Faridabad. India
Year:
Season: May-Jun
Volumen: 57
Number: 3
Pages: 317-325
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Analítico, descriptivo
English abstract 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
Keyword: 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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