PREMISE OF THE STUDY: Storage oil (triacylglycerol) accumulates in tissues such as the embryo and endosperm of seeds and the fruit mesocarp, but seldom in underground organs. As a rare exception, cultivated variants of yellow nutsedge (Cyperus esculentus) contain high amounts of both oil and starch in the mature tubers. • METHODS: Biochemical analyses and light and electron microscopy were used to study the accumulation patterns of storage nutrients in developing nutsedge tubers. • KEY RESULTS: During the initial phase of tuber development, the conducting rhizome tissue is transformed into a storage compartment, then massive storage reserves accumulate in the tuber. At the beginning of tuber development, a large sugar load coincided with the onset of starch accumulation. Oil accumulation started later, concomitant with a substantial drop in the sugar content. Initially, oil accumulated at a lower rate compared to starch, but the rate later increased; after 6 wk, oil made up 24% of tuber dry mass, while starch made up 32%. Protein concentration changed only a small amount throughout this development. Oil and starch accumulated in the same cells throughout the tubers in a sequential fashion during tuber development. • CONCLUSIONS: The developmental pattern in the build up of storage nutrients in the tubers highlights nutsedge as a novel model plant, having potential to significantly widen our understanding on how synthesis of storage reserves, and in particular oils, is regulated and directed in nonseed tissues such as tubers and roots.
PREMISE OF THE STUDY: Storage oil (triacylglycerol) accumulates in tissues such as the embryo and endosperm of seeds and the fruit mesocarp, but seldom in underground organs. As a rare exception, cultivated variants of yellow nutsedge (Cyperus esculentus) contain high amounts of both oil and starch in the mature tubers. • METHODS: Biochemical analyses and light and electron microscopy were used to study the accumulation patterns of storage nutrients in developing nutsedge tubers. • KEY RESULTS: During the initial phase of tuber development, the conducting rhizome tissue is transformed into a storage compartment, then massive storage reserves accumulate in the tuber. At the beginning of tuber development, a large sugar load coincided with the onset of starch accumulation. Oil accumulation started later, concomitant with a substantial drop in the sugar content. Initially, oil accumulated at a lower rate compared to starch, but the rate later increased; after 6 wk, oil made up 24% of tuber dry mass, while starch made up 32%. Protein concentration changed only a small amount throughout this development. Oil and starch accumulated in the same cells throughout the tubers in a sequential fashion during tuber development. • CONCLUSIONS: The developmental pattern in the build up of storage nutrients in the tubers highlights nutsedge as a novel model plant, having potential to significantly widen our understanding on how synthesis of storage reserves, and in particular oils, is regulated and directed in nonseed tissues such as tubers and roots.
Authors: Anders S Carlsson; Jenny Lindberg Yilmaz; Allan G Green; Sten Stymne; Per Hofvander Journal: Eur J Lipid Sci Technol Date: 2011-07 Impact factor: 2.679
Authors: Noemí Araceli Rivera Casado; María del Carmen Montes Horcasitas; Refugio Rodríguez Vázquez; Fernando José Esparza García; Josefina Pérez Vargas; Armando Ariza Castolo; Ronald Ferrera-Cerrato; Octavio Gómez Guzmán; Graciano Calva Calva Journal: PLoS One Date: 2015-10-16 Impact factor: 3.240
Authors: Per Hofvander; Till Ischebeck; Helle Turesson; Sandeep K Kushwaha; Ivo Feussner; Anders S Carlsson; Mariette Andersson Journal: Plant Biotechnol J Date: 2016-03-17 Impact factor: 9.803