title: Spatial and temporal expression of a maize lipid transfer protein gene.
abstract: We studied the temporal and spatial pattern of lipid transfer protein (LTP) gene expression, as well as the localization of this protein, in maize. Using an LTP gene, we observed an accumulation of LTP mRNA in embryos and endosperms during seed maturation. LTP gene expression was also investigated in young seedlings. After germination, the level of LTP mRNA in the coleoptile increased, with a maximum at 7 days, whereas LTP mRNA levels were low in the scutellum and negligible in roots. The high levels of LTP mRNA found in coleoptiles and embryos were confirmed by in situ hybridization. Moreover, LTP gene expression appeared to be localized in the external cellular layers and around the leaf veins. Using immunogold methods, we also observed that LTP was distributed heterogeneously in the different cells of coleoptiles and leaves. The highest concentrations of LTP were found in the outer epidermis of the coleoptiles as well as the leaf veins. Together, our observations indicate that LTP gene expression is not only organ specific and time specific but also cell specific.
authors.affiliation: Physiologie du Développement des Plantes, Centre National de la Recherche Scientifique (CNRS) (URA 1180), Université Pierre et Marie Curie, Paris, France.
authors.forename: L
authors.initials: L
authors.lastname: Sossountzov
authors.forename: L
authors.initials: L
authors.lastname: Ruiz-Avila
authors.forename: F
authors.initials: F
authors.lastname: Vignols
authors.forename: A
authors.initials: A
authors.lastname: Jolliot
authors.forename: V
authors.initials: V
authors.lastname: Arondel
authors.forename: F
authors.initials: F
authors.lastname: Tchang
authors.forename: M
authors.initials: M
authors.lastname: Grosbois
authors.forename: F
authors.initials: F
authors.lastname: Guerbette
authors.forename: E
authors.initials: E
authors.lastname: Miginiac
authors.forename: M
authors.initials: M
authors.lastname: Delseny
mesh_terms: D052179:Antigens, Plant; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D005786:Gene Expression Regulation; D007150:Immunohistochemistry; D009693:Nucleic Acid Hybridization; D009928:Organ Specificity; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D012639:Seeds / Q000235:genetics / Q000378:metabolism; D003313:Zea mays / Q000196:embryology / Q000235:genetics* / Q000378:metabolism
chemical_list: D052179:Antigens, Plant; D002352:Carrier Proteins; D010940:Plant Proteins; D012333:RNA, Messenger; C511920:lipid transfer proteins, plant