title: Protective effect of cerium ion against ultraviolet B radiation-induced water stress in soybean seedlings.
abstract: Effects of cerium ion (Ce(III)) on water relations of soybean seedlings (Glycine max L.) under ultraviolet B radiation (UV-B, 280-320 nm) stress were investigated under laboratory conditions. UV-B radiation not only affected the contents of two osmolytes (proline, soluble sugar) in soybean seedlings, but also inhibited the transpiration in soybean seedlings by decreasing the stomatal density and conductance. The two effects caused the inhibition in the osmotic and metabolic absorption of water, which decreased the water content and the free water/bound water ratio. Obviously, UV-B radiation led to water stress, causing the decrease in the photosynthesis in soybean seedlings. The pretreatment with 20 mg L(-1) Ce(III) could alleviate UV-B-induced water stress by regulating the osmotic and metabolic absorption of water in soybean seedlings. The alleviated effect caused the increase in the photosynthesis and the growth of soybean seedlings. It is one of the protective effect mechanisms of Ce(III) against the UV-B radiation-induced damage to plants.
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
authors.forename: Chun Xia
authors.initials: CX
authors.lastname: Mao
authors.forename: Min Min
authors.initials: MM
authors.lastname: Chen
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Hua
authors.initials: H
authors.lastname: Zou
authors.forename: Chan Juan
authors.initials: CJ
authors.lastname: Liang
authors.forename: Li Hong
authors.initials: LH
authors.lastname: Wang
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhou
mesh_terms: D002563:Cerium / Q000737:chemistry / Q000494:pharmacology*; D007477:Ions / Q000737:chemistry / Q000494:pharmacology; D009995:Osmosis / Q000187:drug effects*; D036226:Seedlings / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D013025:Glycine max / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D014466:Ultraviolet Rays; D014867:Water / Q000378:metabolism*
chemical_list: D007477:Ions; D014867:Water; D002563:Cerium