title: Plasticity in sunflower leaf and cell growth under high salinity.
abstract: A group of sunflower lines that exhibit a range of leaf Na(+) concentrations under high salinity was used to explore whether the responses to the osmotic and ionic components of salinity can be distinguished in leaf expansion kinetics analysis. It was expected that at the initial stages of the salt treatment, leaf expansion kinetics changes would be dominated by responses to the osmotic component of salinity, and that later on, ion inclusion would impose further kinetics changes. It was also expected that differential leaf Na(+) accumulation would be reflected in specific changes in cell division and expansion rates. Plants of four sunflower lines were gradually treated with a relatively high (130 mm NaCl) salt treatment. Leaf expansion kinetics curves were compared in leaves that were formed before, during and after the initiation of the salt treatment. Leaf areas were smaller in salt-treated plants, but the analysis of growth curves did not reveal differences that could be attributed to differential Na(+) accumulation, since similar changes in leaf expansion kinetics were observed in lines with different magnitudes of salt accumulation. Nevertheless, in a high leaf Na(+) -including line, cell divisions were affected earlier, resulting in leaves with proportionally fewer cells than in a Na(+) -excluding line. A distinct change in leaf epidermal pavement shape caused by salinity is reported for the first time. Mature pavement cells in leaves of control plants exhibited typical lobed, jigsaw-puzzle shape, whereas in treated plants, they tended to retain closer-to-circular shapes and a lower number of lobes.
authors.affiliation: Facultad de Ciencias Agrarias, Instituto de Agrobiotecnología del Litoral (CONICET-Universidad Nacional del Litoral), Esperanza, Argentina; CONICET, Consejo de Investigaciones Científicas y Técnicas de la República Argentina, Córdoba, Argentina.
authors.forename: G
authors.initials: G
authors.lastname: Céccoli
authors.forename: D
authors.initials: D
authors.lastname: Bustos
authors.forename: L I
authors.initials: LI
authors.lastname: Ortega
authors.forename: M E
authors.initials: ME
authors.lastname: Senn
authors.forename: A
authors.initials: A
authors.lastname: Vegetti
authors.forename: E
authors.initials: E
authors.lastname: Taleisnik
mesh_terms: D048430:Cell Shape / Q000187:drug effects; D006368:Helianthus / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D009995:Osmosis; D019441:Plant Epidermis / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D054712:Salinity; D055049:Salt Tolerance; D012965:Sodium Chloride / Q000494:pharmacology*
chemical_list: D012965:Sodium Chloride
keywords: Helianthus annuus L.; leaf growth; pavement cell shape; salinity; sunflower