title: Combined effects of Psoralens and ultraviolet-B on growth, pigmentation and biochemical parameters of Abelmoschus esculentus L.
abstract: The effects of pre-treatment of Psoralens (furocoumarin compounds) and supplemental ultraviolet-B (sUV-B) were studied on plant growth, photosynthetic and non-photosynthetic pigments, protein, phenylalanine ammonia lyase (PAL) activity and antioxidative defense potential as well as their ultimate effects on biomass production in Abelmoschus esculentus L. (Okra) plants. Psoralens are capable of absorbing radiant energy and stimulating the pigmentation of human skin when photo-activated in presence of UV-A or UV-B making them beneficial in the treatment of vitilago. Pre-treatment of Psoralens against sUV-B (pUV-B), stimulates higher production of UV-B protective pigments (flavonoids and carotenoids) and helps in maintaining its biomass against UV-B stress. Antioxidative defense system in the test plant was activated by combined treatment of Psoralens and sUV-B as evidenced by the enhanced activity of enzymatic (ascorbate peroxidase-APX, superoxide dismutase-SOD, POX) and non-enzymatic (ascorbic acid and phenol) antioxidants. Individual treatments of Psoralens and sUV-B showed inhibitory effect on various morphological traits i.e. reduction in plant height, leaf area and ultimately on biomass production. Our results clearly indicated that adverse effect of sUV-B on biomass production was ameliorated by pre- treatment with Psoralens.
authors.affiliation: Lab of Air Pollution and Global Climate Change, Department of Botany, Banaras Hindu University, Varanasi 221 005, India.
authors.forename: Rima
authors.initials: R
authors.lastname: Kumari
authors.forename: Suruchi
authors.initials: S
authors.lastname: Singh
authors.forename: S B
authors.initials: SB
authors.lastname: Agrawal
mesh_terms: D028483:Abelmoschus / Q000187:drug effects* / Q000254:growth & development / Q000528:radiation effects*; D000975:Antioxidants / Q000378:metabolism; D002338:Carotenoids / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D011564:Furocoumarins / Q000494:pharmacology*; D017319:Photosensitizing Agents / Q000494:pharmacology*; D010788:Photosynthesis / Q000187:drug effects / Q000528:radiation effects; D010858:Pigmentation / Q000187:drug effects* / Q000528:radiation effects*; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D011564:Furocoumarins; D017319:Photosensitizing Agents; D002734:Chlorophyll; D002338:Carotenoids