title: Light-harvesting chlorophyll a/b-binding proteins are required for stomatal response to abscisic acid in Arabidopsis.
abstract: The light-harvesting chlorophyll a/b binding proteins (LHCB) are perhaps the most abundant membrane proteins in nature. It is reported here that the down-regulation or disruption of any member of the LHCB family, LHCB1, LHCB2, LHCB3, LHCB4, LHCB5, or LHCB6, reduces responsiveness of stomatal movement to ABA, and therefore results in a decrease in plant tolerance to drought stress in Arabidopsis thaliana. By contrast, over-expression of a LHCB member, LHCB6, enhances stomatal sensitivity to ABA. In addition, the reactive oxygen species (ROS) homeostasis and a set of ABA-responsive genes are altered in the lhcb mutants. These data demonstrate that LHCBs play a positive role in guard cell signalling in response to ABA and suggest that they may be involved in ABA signalling partly by modulating ROS homeostasis.
authors.affiliation: College of Biological Sciences, China Agricultural University, Beijing 100094, China.
authors.forename: Yan-Hong
authors.initials: YH
authors.lastname: Xu
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
authors.forename: Lu
authors.initials: L
authors.lastname: Yan
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Liu
authors.forename: Shang-Chuan
authors.initials: SC
authors.lastname: Jiang
authors.forename: Yuan-Yue
authors.initials: YY
authors.lastname: Shen
authors.forename: Xiao-Fang
authors.initials: XF
authors.lastname: Wang
authors.forename: Da-Peng
authors.initials: DP
authors.lastname: Zhang
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology*; D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D061146:Chlorophyll Binding Proteins / Q000235:genetics / Q000378:metabolism*; D054046:Plant Stomata / Q000187:drug effects* / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D061146:Chlorophyll Binding Proteins; D017382:Reactive Oxygen Species; D000040:Abscisic Acid