A Dual-Promoter Gene Orchestrates the Sucrose-Coordinated Synthesis of Starch and Fructan in Barley

• DOI: 10.1016/j.molp.2017.10.013
• Publication Date: 2017-11-08T04:13:13Z
• Authors: Yunkai Jin; Mingliang Fei; Sara Rosenquist; Lu Jin; Suresh Gohil; Corine Sandström; Helena Olsson; Cecilia Persson; Anna-Stina Höglund; Gunnel Fransson; Ying Ruan; Per Åman; Christer Jansson; Chunlin Liu; Roger Andersson; Chuanxin Sun
• Keywords: Fructan

Sequential carbohydrate synthesis is important for plant survival because it guarantees energy supplies growth and development during ontogeny reproduction. Starch fructan are two carbohydrates in many flowering plants human diets. Understanding this coordinated starch unraveling how allocate photosynthates prioritize different could lead to improvements cereals agriculture the purposes of greater food security production quality. Here, we report a system from single gene barley employing alternative promoters, one intronic/exonic, generate sequence-overlapping but functionally opposing transcription factors, sensing sucrose, potentially via sucrose/glucose/fructose/trehalose 6-phosphate signaling. The employs an autoregulatory mechanism perceiving sucrose-controlled trans activity on promoter orchestrating by competitive factor binding other promoter. As case point physiological roles system, have demonstrated that multitasking can be exploited breeding with tailored amounts produce healthy ingredients. identification intron/exon-spanning hosting gene, resulting proteins distinct functions, adds complexity genomes.