title: Supplemental UV-B radiation induced changes in growth, pigments and antioxidant pool of bean (Dolichos lablab) under field conditions.
abstract: Present study is conducted to evaluate the response of bean (Dolichos lablabcv . pusa early prolific) plants to supplemental UV-B (sUV-B: 280-315 nm: 7.2 kJ m(-2) d(-1)) radiation. UV-B caused alteration in biomass translocation pattern with more retention of biomass in below ground parts leading to an increment in root shoot ratio. Specific leaf area (SLA) which is the measure of leaf thinness, increased in plants under sUV-B exposure by 95.7 and 82.3% after 15 and 30 days after germination. Photosynthetic machinery of bean plants was the potential target of UV-B as photosynthetic rate was decreased by 88.6% at 30 days after germination. sUV-B lead to the formation of reactive oxygen species thus generating oxidative stress. Stimulation of antioxidant defense system (enzymatic and non-enzymatic) was observed due to sUV-B radiation. Phenolic content decreased (34.7 and 18.6%) but protein showed varied response, increased initially (34%) thereafter declined (10.2%) under sUV-B radiation.
authors: Laboratory for Air Pollution and Global Climate Change, Ecology Research Circle, Department of Botany, Banaras Hindu University, Varanasi-221005, India.
authors: Raghubansh
authors: R
authors: Singh
authors: Suruchi
authors: S
authors: Singh
authors: Ruchika
authors: R
authors: Tripathi
authors: S B
authors: SB
authors: Agrawal
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D031294:Dolichos / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D010860:Pigments, Biological / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D010860:Pigments, Biological