title: Morphological and metabolic alterations in duckweed (Spirodela polyrhiza) on long-term low-level chronic UV-B exposure.
abstract: Laboratory grown duckweed (Spirodela polyrhiza) plants were exposed to 0.72 and 1.44J of UV-B radiation daily for 7 days at 0.4mW/cm(2) intensity. Chlorosis and necrosis were observed along with depletion in protein, pigments (chlorophyll, pheophytin, carotenoids, phycoerythrin, phycocyanin, and flavoxanthin), biomass, root length, and frond size in UV-B-exposed plants. The study confirms morphological and metabolic alterations leading to reduction in the productivity of duckweed following long-term exposure to UV-B radiation.
authors.affiliation: Photobiology Division, Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Post Box No. 80, Lucknow 226001, India.
authors.forename: M
authors.initials: M
authors.lastname: Farooq
authors.forename: U
authors.initials: U
authors.lastname: Shankar
authors.forename: R S
authors.initials: RS
authors.lastname: Ray
authors.forename: R B
authors.initials: RB
authors.lastname: Misra
authors.forename: N
authors.initials: N
authors.lastname: Agrawal
authors.forename: K
authors.initials: K
authors.lastname: Verma
authors.forename: R K
authors.initials: RK
authors.lastname: Hans
mesh_terms: D029064:Araceae / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D010860:Pigments, Biological / Q000378:metabolism; D018515:Plant Leaves / Q000254:growth & development / Q000528:radiation effects; D010940:Plant Proteins / Q000378:metabolism; D018517:Plant Roots / Q000254:growth & development / Q000528:radiation effects; D013213:Starch / Q000378:metabolism; D014466:Ultraviolet Rays / Q000009:adverse effects*
chemical_list: D010860:Pigments, Biological; D010940:Plant Proteins; D013213:Starch