title: Temperature effect on triacylglycerol species in seed oil from high stearic sunflower lines with different genetic backgrounds.
abstract: BACKGROUND
  This study characterized the influence of temperature during grain filling on the saturated fatty acid distribution in triacylglycerol molecules from high stearic sunflower lines with different genetic backgrounds. Two growth chamber experiments were conducted with day/night temperatures of 16/16, 26/16, 26/26 and 32/26 °C.
  
  
  RESULTS
  In all genotypes, independently of the genetic background, higher temperatures increased palmitic and oleic acid and reduced linoleic acid concentrations. Increasing night temperature produced an increase in saturated-unsaturated-saturated species, indicating a more symmetrical distribution of saturated fatty acids. The solid fat index was more affected by temperature during grain filling in lines with high linoleic than high oleic background. Higher variations in symmetry among night temperatures were observed in lines with high oleic background, which are more stable in fatty acid composition.
  
  
  CONCLUSIONS
  The effect of temperature on triacylglycerol composition is not completely explained by its effect on fatty acid composition. Thus night temperature affects oil properties via its effects on fatty acid synthesis and on the distribution of fatty acids in the triacylglycerol molecules. © 2016 Society of Chemical Industry.
authors.affiliation: Laboratorio de Fisiología Vegetal, Unidad Integrada Facultad de Ciencias Agrarias (UNMdP), Estación Experimental Agropecuaria INTA Balcarce, Balcarce, Argentina.|Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
authors.forename: Natalia G
authors.initials: NG
authors.lastname: Izquierdo
authors.affiliation: Instituto de la Grasa (CSIC), Campus Universitario Pablo de Olavide, E-41013, Seville, Spain.
authors.forename: Enrique
authors.initials: E
authors.lastname: Martínez-Force
authors.affiliation: Instituto de la Grasa (CSIC), Campus Universitario Pablo de Olavide, E-41013, Seville, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: Garcés
authors.affiliation: Laboratorio de Fisiología Vegetal, Unidad Integrada Facultad de Ciencias Agrarias (UNMdP), Estación Experimental Agropecuaria INTA Balcarce, Balcarce, Argentina.|Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
authors.forename: Luis An
authors.initials: LA
authors.lastname: Aguirrezábal
authors.affiliation: Center for Biotechnology Research, Advanta Semillas SAIC, Ruta 226 Km 60.5, 7620, Balcarce, Argentina.
authors.forename: Andrés
authors.initials: A
authors.lastname: Zambelli
authors.affiliation: Center for Biotechnology Research, Advanta Semillas SAIC, Ruta 226 Km 60.5, 7620, Balcarce, Argentina.
authors.forename: Roberto
authors.initials: R
authors.lastname: Reid
mesh_terms: D001118:Argentina; D004041:Dietary Fats / Q000032:analysis; D044943:Fatty Acid Desaturases / Q000235:genetics / Q000378:metabolism; D064429:Fatty Acid Synthases / Q000235:genetics / Q000378:metabolism; D005227:Fatty Acids / Q000032:analysis / Q000096:biosynthesis*; D063427:Food Quality; D006368:Helianthus / Q000737:chemistry / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D006801:Humans; D007536:Isomerism; D019787:Linoleic Acid / Q000032:analysis / Q000096:biosynthesis; D009154:Mutation; D009753:Nutritive Value; D019301:Oleic Acid / Q000032:analysis / Q000096:biosynthesis; D000069600:Plant Breeding; D010938:Plant Oils / Q000737:chemistry*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D012639:Seeds / Q000737:chemistry / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D013229:Stearic Acids / Q000032:analysis / Q000378:metabolism; D000074242:Sunflower Oil; D013696:Temperature; D014280:Triglycerides / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D010938:Plant Oils; D010940:Plant Proteins; D013229:Stearic Acids; D000074242:Sunflower Oil; D014280:Triglycerides; D019301:Oleic Acid; D019787:Linoleic Acid; D044943:Fatty Acid Desaturases; C040448:delta-12 fatty acid desaturase; D064429:Fatty Acid Synthases
keywords: high stearic mutation; oil quality; temperature; triacylglycerol composition