title: Involvement of oxyradicals in promotion/inhibition of expansion growth in cucumber cotyledons.
abstract: Cytokinin-induced expansion growth of cucumber cotyledons and its interaction with UV-B (280-320 nm) was studied with reference to oxyradicals. UV-B radiation enhanced the level of oxyradicals in the cotyledons measured by EPR spectroscopy. Cytokinin promoted expansion growth was inhibited by UV-B radiation. Cytokinins reduced the level of oxyradicals in dark grown cotyledons, while promoting growth. Overproduction of oxyradicals by UV-B could not be fully accounted for the inhibition of growth of cotyledons, since quenching of radicals by cytokinins did not fully restore inhibition of growth.
authors.affiliation: School of Life Sciences, Devi Ahilya University, Khandwa Road, Indore 452 017, India. sunitakataria@hotmail.com
authors.forename: Sunita
authors.initials: S
authors.lastname: Kataria
authors.forename: Karishma
authors.initials: K
authors.lastname: Jain
authors.forename: K N
authors.initials: KN
authors.lastname: Guruprasad
mesh_terms: D018553:Cucumis sativus / Q000378:metabolism*; D003583:Cytokinins / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D010100:Oxygen / Q000737:chemistry*; D012639:Seeds / Q000378:metabolism; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D003583:Cytokinins; D005609:Free Radicals; D010100:Oxygen