Induction and identification of useful mutations for root quality traits in cassava

Sanchez Teresa, Roserob A., Tofino Adriana P., Denyer Kay, Smith Alison M., Ceballos Hernan, Dufour Dominique, Morante Nelson, Pérez Juan Carlos. 2009. Induction and identification of useful mutations for root quality traits in cassava. In : Induced Plant Mutations in the Genomics Era : Proceeding of the International Symposium on Induced Mutations in Plants (ISIM), Vienna, Austria, 12-15 August 2008. G.Y. Shu(ed.). Rome ; FAO, 2009. - ISBN : s.n., 266-269.

Résumé : A population of about 1,500 M2 genotypes (from five different cassava families), were screened for relevant traits. Roots could be harvested from 800 of these genotypes and thoroughly screened for starch quality traits. Four distinctive phenotypes were identified: a small granule, high-amylose starch mutation with almost no paste viscosity, a group of genotypes with tolerance to post-harvest physiological deterioration, a "hollow" starch granule mutation with intermediate viscosity peaks, and a group of genotypes with a starchless (potentially "sugary") root mutation. The last two mutations need to be further characterized and confirmed. The small granule mutation has been fully characterized and a lesion in the isoamylase one or two loci has been postulated to be the most likely site. The frequency of this mutation (present in two lineages out of the 800 M2 genotypes analyzed) suggests that mutation at the putative locus is easy to attain, or else that the repair mechanisms are less efficient at that site. Several of these unusual phenotypes identified offer important commercial advantages.

Mots-clés Agrovoc : Manihot esculenta

Mots-clés géographiques Agrovoc : Colombie

Classification Agris : F30 - Génétique et amélioration des plantes
Q04 - Composition des produits alimentaires

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Sanchez Teresa, CIAT (COL)
• Roserob A., Universidad Nacional de Colombia (COL)
• Tofino Adriana P., Universidad Nacional de Colombia (COL)
• Denyer Kay, John Innes Centre (GBR)
• Smith Alison M., John Innes Centre (GBR)
• Ceballos Hernan, CIAT (COL)
• Dufour Dominique, CIRAD-PERSYST-UMR Qualisud (COL) ORCID: 0000-0002-7794-8671
• Morante Nelson, CIAT (COL)
• Pérez Juan Carlos, CIAT (COL)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/558538/)

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