title: 15N allocation into wheat grains (Triticum aestivum L.) influenced by sowing rate and water supply at flowering under a Mediterranean climate.
abstract: This study examined the effects of a reduced wheat sowing rate (250 vs. 500 grains m-2) on grain yield, uptake of15N into grains, and the incorporation into gluten and non-gluten proteins of wheat under field conditions in the Aegean region. A single15N application was applied at stem elongation, at flowering, or at both developmental stages. Each15N treatment included either additional water supply, or no additional water supply at flowering. Sowing rate (either 250 or 500 grains m-2) had no impact on grain yield. Grain yield increased with additional water supply, but at the expense of protein quality, because of a decrease in the protein content of gluten. The15N content of the gluten and non-gluten proteins at grain maturity was not different among cultivars.15N applied at both stem elongation and flowering was found in comparable amounts in grains and protein fractions, irrespective of sowing rate.
authors.affiliation: a Agricultural Climatology , Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt University of Berlin , Berlin , Germany.
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Götz
authors.affiliation: b Department of Crop Science, Faculty of Agriculture , Adnan Menderes University , Aydin , Turkey.
authors.forename: Osman
authors.initials: O
authors.lastname: Erekul
authors.affiliation: c Research Laboratory, Children's Hospital , University of Rostock , Rostock , Germany.
authors.forename: Klaus Dieter
authors.initials: KD
authors.lastname: Wutzke
authors.affiliation: b Department of Crop Science, Faculty of Agriculture , Adnan Menderes University , Aydin , Turkey.
authors.forename: Yakup Onur
authors.initials: YO
authors.lastname: Koca
authors.affiliation: b Department of Crop Science, Faculty of Agriculture , Adnan Menderes University , Aydin , Turkey.
authors.forename: Tuğçe
authors.initials: T
authors.lastname: Aksu
mesh_terms: D000383:Agriculture / Q000379:methods; D055864:Droughts; D002523:Edible Grain / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism; D004784:Environmental Monitoring; D009587:Nitrogen Isotopes / Q000032:analysis; D010940:Plant Proteins / Q000378:metabolism*; D014908:Triticum / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D014421:Turkey
chemical_list: D009587:Nitrogen Isotopes; D010940:Plant Proteins
keywords: Gluten; Turkey; grain yield; irrigation; isotope biology; isotope ecology; nitrogen-15; proteins; sowing rate; wheat