title: Functional analysis of Gossypium hirsutum cellulose synthase catalytic subunit 4 promoter in transgenic Arabidopsis and cotton tissues.
abstract: Gossypium hirsutum cellulose synthase catalytic subunit 4 (GhCesA4) plays an important role in cellulose biosynthesis during cotton fiber development. The transcript levels of GhCesA4 are significantly up-regulated as secondary cell wall cellulose is produced in developing cotton fibers. To understand the molecular mechanisms involved in transcriptional regulation of GhCesA4, β-glucuronidase (GUS) activity regulated by a GhCesA4 promoter (-2574/+56) or progressively deleted promoters were determined in both cotton tissues and transgenic Arabidopsis. The spatial regulation of GhCesA4 expression was similar between cotton tissues and transgenic Arabidopsis. GUS activity regulated by the GhCesA4 promoter (-2574/+56) was found in trichomes and root vascular tissues in both cotton and transgenic Arabidopsis. The -2574/-1824 region was responsible for up-regulation of GhCesA4 expression in trichomes and root vascular tissues in transgenic Arabidopsis. The -1824/-1355 region negatively regulated GhCesA4 expression in most Arabidopsis vascular tissues. For vascular expression in stems and leaves, the -898/-693 region was required. The -693/-320 region of the GhCesA4 promoter was necessary for basal expression of GhCesA4 in cotton roots as well as Arabidopsis roots. Exogenous phytohormonal treatments on transgenic Arabidopsis revealed that phytohormones may be involved in the differential regulation of GhCesA4 during cotton fiber development.
authors.affiliation: Southern Regional Research Center, Cotton Fiber Bioscience, USDA-ARS, 1100 Robert E. Lee Blvd, New Orleans, LA 70124, USA. heejin.kim@ars.usda.gov
authors.forename: Hee Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Norimoto
authors.initials: N
authors.lastname: Murai
authors.forename: David D
authors.initials: DD
authors.lastname: Fang
authors.forename: Barbara A
authors.initials: BA
authors.lastname: Triplett
mesh_terms: D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics; D001483:Base Sequence; D020134:Catalytic Domain / Q000235:genetics*; D002482:Cellulose / Q000096:biosynthesis*; D018506:Gene Expression Regulation, Plant; D005964:Glucosyltransferases / Q000235:genetics / Q000378:metabolism*; D005966:Glucuronidase / Q000235:genetics / Q000378:metabolism; D003368:Gossypium / Q000201:enzymology / Q000235:genetics*; D010937:Plant Growth Regulators / Q000494:pharmacology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000201:enzymology / Q000235:genetics; D030821:Plants, Genetically Modified / Q000201:enzymology / Q000235:genetics; D011401:Promoter Regions, Genetic; D017422:Sequence Analysis, DNA; D017384:Sequence Deletion
chemical_list: D010937:Plant Growth Regulators; D010940:Plant Proteins; D002482:Cellulose; D005964:Glucosyltransferases; C478648:cellulose synthase; D005966:Glucuronidase