Genetic variabilities and genetic gains for yield components in regional sugarcane breeding programmes on Réunion Island

Dumont Thomas, Thong-Chane Audrey, Barau Laurent, Siegmund Bernard, Hoarau Jean-Yves. 2019. Genetic variabilities and genetic gains for yield components in regional sugarcane breeding programmes on Réunion Island. Sugar Tech, 21 (6) : 868-878.

Quartile : Q3, Sujet : AGRONOMY

Résumé : Sugarcane variety development programmes are costly and lengthy. It appears important to periodically assess their ability to select competitive genotypes for yield components and provide genetic gains. This article reports a 10-year retrospective analysis of successive variety trials conducted in four regional breeding programmes on Réunion Island in the most advanced regional selection stage. The four variety programmes were dedicated to the humid coastal zone (LM), the per-humid coastal zone (SB), the irrigated dry coastal zone (ES) and the dry high lands (VB) of the local industry. Using mixed linear models, the objective of the study was to (1) assess genetic variabilities available for yield components in this advanced selection stage; and (2) estimate trends of genetic gains achieved over the last decade across the four programmes. Yield components were: cane yield (CY), estimable recoverable sugar (ERS), fibre content (FIB) and economic index (EI). Broad-sense heritabilities were high (0.70–0.91) for all traits in each programme. Mean genetic coefficients of variation were about twice as high for CY (14.1%) and EI (15.5%) compared to ERS (5.7%) and FIB (6.6%). A higher probability of identifying superior varieties was found for CY and EI in two of the four programmes characterized either by thermal and hydric stresses (VB) or by an edaphic stress (SB). Simple linear regression of variety performances versus years of selection revealed trends in genetic gains for EI ranging between 0.53 and 1.81% increase per year that were highly significant (P < 0.001) in the two programmes (LM and VB).

Mots-clés Agrovoc : Saccharum officinarum, canne à sucre, amélioration génétique, rendement des cultures, modèle de simulation

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés libres : Mixed linear models, Sugarcane, Breeding programmes, Yield components

Classification Agris : F30 - Génétique et amélioration des plantes
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Regional Development Fund

Auteurs et affiliations

• Dumont Thomas, eRcane (REU)
• Thong-Chane Audrey, eRcane (REU)
• Barau Laurent, eRcane (REU)
• Siegmund Bernard, eRcane (REU)
• Hoarau Jean-Yves, CIRAD-BIOS-UMR AGAP (REU) ORCID: 0000-0001-9734-4165 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591770/)

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