title: Arabidopsis CALCINEURIN B-LIKE10 Functions Independently of the SOS Pathway during Reproductive Development in Saline Conditions.
abstract: The accumulation of sodium in soil (saline conditions) negatively affects plant growth and development. The Salt Overly Sensitive (SOS) pathway in Arabidopsis (Arabidopsis thaliana) functions to remove sodium from the cytosol during vegetative development preventing its accumulation to toxic levels. In this pathway, the SOS3 and CALCINEURIN B-LIKE10 (CBL10) calcium sensors interact with the SOS2 protein kinase to activate sodium/proton exchange at the plasma membrane (SOS1) or vacuolar membrane. To determine if the same pathway functions during reproductive development in response to salt, fertility was analyzed in wild type and the SOS pathway mutants grown in saline conditions. In response to salt, CBL10 functions early in reproductive development before fertilization, while SOS1 functions mostly after fertilization when seed development begins. Neither SOS2 nor SOS3 function in reproductive development in response to salt. Loss of CBL10 function resulted in reduced anther dehiscence, shortened stamen filaments, and aborted pollen development. In addition, cbl10 mutant pistils could not sustain the growth of wild-type pollen tubes. These results suggest that CBL10 is critical for reproductive development in the presence of salt and that it functions in different pathways during vegetative and reproductive development.
authors.affiliation: School of Plant Sciences (S.M.M., C.A.M., R.Y., K.S.S.) and School of Natural Resources and the Environment (S.E.S.), University of Arizona, Tucson, Arizona 85721.
authors.forename: Shea M
authors.identifier: 0000-0003-3575-2723
authors.initials: SM
authors.lastname: Monihan
authors.affiliation: School of Plant Sciences (S.M.M., C.A.M., R.Y., K.S.S.) and School of Natural Resources and the Environment (S.E.S.), University of Arizona, Tucson, Arizona 85721.
authors.forename: Courtney A
authors.identifier: 0000-0001-7703-3861
authors.initials: CA
authors.lastname: Magness
authors.affiliation: School of Plant Sciences (S.M.M., C.A.M., R.Y., K.S.S.) and School of Natural Resources and the Environment (S.E.S.), University of Arizona, Tucson, Arizona 85721.
authors.forename: Ramin
authors.identifier: 0000-0002-0975-2984
authors.initials: R
authors.lastname: Yadegari
authors.affiliation: School of Plant Sciences (S.M.M., C.A.M., R.Y., K.S.S.) and School of Natural Resources and the Environment (S.E.S.), University of Arizona, Tucson, Arizona 85721.
authors.forename: Steven E
authors.initials: SE
authors.lastname: Smith
authors.affiliation: School of Plant Sciences (S.M.M., C.A.M., R.Y., K.S.S.) and School of Natural Resources and the Environment (S.E.S.), University of Arizona, Tucson, Arizona 85721 schumake@email.arizona.edu.
authors.forename: Karen S
authors.initials: KS
authors.lastname: Schumaker
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D035264:Flowers / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D053858:Metabolic Networks and Pathways / Q000235:genetics / Q000502:physiology; D009154:Mutation; D030821:Plants, Genetically Modified; D054712:Salinity; D012965:Sodium Chloride / Q000494:pharmacology
chemical_list: D029681:Arabidopsis Proteins; C484078:CBL10 protein, Arabidopsis; D002135:Calcium-Binding Proteins; D012965:Sodium Chloride