Potential of the small-granule starch mutation for the Bioethanol Industry.

Dufour Dominique, Ceballos Hernan, Sanchez Teresa, Morante Nelson, Moreno Jhon L., Rolland-Sabaté Agnès, Hershey Clair. 2012. Potential of the small-granule starch mutation for the Bioethanol Industry.. In : Second Scientific Conference of the Global Cassava Patnership the 21st Century (GCP21-II), Kampala, Uganda, June 18-22, 2012. s.l. : s.n., Résumé, 1 p. Scientific Conference of the Global Cassava Partnership for the 21st Century. 2, Kampala, Ouganda, 18 Juin 2012/22 Juin 2012.

Matériel d'accompagnement : 1 poster

Résumé : The industrial starch market is undergoing major expansion, but certain specific industrial uses cannot be satisfied by native starches and, therefore, chemical or physical modification is necessary. Mutations in the cassava starch biosynthesis pathways were discovered at CIAT (Cali, Colombia) few years ago. A starch mutation induced by gamma rays radiation resulted in a deeply modified branching pattern of amylopectin as well as other starch characteristics and properties. These modifications include changes in starch granule ultrastructure (e.g. decreased starch crystallinity), a weak organized structure, and increased susceptibility to mild acid and enzymatic raw starch hydrolysis (fastest and most efficient hydrolysis of all studied native starches). This mutation could offer interesting advantages for the production of bioethanol. Surprisingly this mutation also results in increased proportion of amylopectin. Hydrolysis was more dependent on granule morphology than on starch chemical composition. Recent crosses produced segregating progenies whose starch had the small-granule characteristics, but amylopectin content ranged from 19 to 42%. Rapid viscoamylograms of the latter starch showed very distinctive patterns.

Classification Agris : F60 - Physiologie et biochimie végétale
P06 - Sources d'énergie renouvelable
F30 - Génétique et amélioration des plantes

Auteurs et affiliations

• Dufour Dominique, CIRAD-PERSYST-UMR Qualisud (COL) ORCID: 0000-0002-7794-8671
• Ceballos Hernan, CIAT (COL)
• Sanchez Teresa, CIAT (COL)
• Morante Nelson, CIAT (COL)
• Moreno Jhon L., CIAT (COL)
• Rolland-Sabaté Agnès, INRA (FRA)
• Hershey Clair, CIAT (COL)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/565673/)

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