Lipid Partitioning in Maize ([i]Zea mays[/i] L.) Endosperm Highlights Relationships among Starch Lipids, Amylose, and Vitreousness
Gayral, Mathieu | Bakan, Benedicte | Dalgalarrondo, Michèle | Elmorjani, Khalil | Delluc, Caroline | Brunet, Sylvie | Linossier, Laurent | Morel, Marie Helene | Marion, Didier | Unité de recherche sur les Biopolymères, Interactions Assemblages (BIA) ; Institut National de la Recherche Agronomique (INRA) | Limagrain Europe | Limagrain Céréales Ingrédients ; Groupe Limagrain | Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Fond Unique Interministeriel (FUI GranoFlakes, F1204004C)
Content and composition of maize endosperm lipids and their partition in the floury and vitreous regions were determined for a set of inbred lines. Neutral lipids, i.e., triglycerides and free fatty acids, accounted for more than 80% of endosperm lipids and are almost 2 times higher in the floury than in the vitreous regions. The composition of endosperm lipids, including their fatty acid unsaturation levels, as well as their distribution may be related to metabolic specificities of the floury and vitreous regions in carbon and nitrogen storage and to the management of stress responses during endosperm cell development. Remarkably, the highest contents of starch lipids were observed systematically within the vitreous endosperm. These high amounts of starch lipids were mainly due to lysophosphatidylcholine and were tightly linked to the highest amylose content. Consequently, the formation of amyloselysophosphatidylcholine complexes has to be considered as an outstanding mechanism affecting endosperm vitreousness.
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