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Grain, sugar and biomass accumulation in tropical sorghums. I. Trade-offs and effects of phenological plasticity

Gutjahr Sylvain, Vaksmann Michel, Dingkuhn Michaël, Thera Korothimi, Trouche Gilles, Braconnier Serge, Luquet Delphine. 2013. Grain, sugar and biomass accumulation in tropical sorghums. I. Trade-offs and effects of phenological plasticity. Functional Plant Biology, 40 (4) : pp. 342-354.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : Grain and sweet sorghum (Sorghum bicolor (L.) Moench) differ in their ability to produce either high grain yield or high sugar concentration in the stems. Some cultivars of sorghum may yield both grains and sugar. This paper investigates the trade-offs among biomass, grain and sugar production. Fourteen tropical sorghum genotypes with contrasted sweetness and PP sensitivity were evaluated in the field near Bamako (Mali) at three sowing dates under favourable rainfed conditions. Plant phenology, morphology, dry matter of different organs and stem sugar content were measured at anthesis and grain maturity. A panicle pruning treatment was implemented after anthesis. Late sowing (shorter days) led to a decrease in total leaf number, dry mass and sugar yield even in PP-insensitive genotypes because of an increased phyllochron. Dry matter production and soluble sugar accumulation were strongly correlated with leaf number. Sugar concentration varied little among sowing dates or between anthesis and maturity. This indicates that sugar accumulation happened mainly before anthesis, thus largely escaping from competition with grain filling. This was confirmed by the low impact of panicle pruning on sugar concentration. Changes in sugar concentration from anthesis to maturity were negatively correlated with harvest index but not with grain yield. Physiological trade-offs among sugar, biomass and grain production under favourable rainfall are small in late-maturing and PP-sensitive sweet sorghums cultivated under sudano-sahelian conditions. The results differ from earlier reports that focussed on early maturing, PP-insensitive germplasm. Further research is needed on the interactions of these traits with agricultural practices and drought. (Résumé d'auteur)

Mots-clés Agrovoc : Sorghum bicolor, Métabolisme des glucides, Photopériodicité, Phénologie, Stockage, Saccharose, Remplissage du grain, Génotype, Physiologie végétale

Mots-clés géographiques Agrovoc : Mali

Classification Agris : F60 - Plant physiology and biochemistry
F30 - Plant genetics and breeding

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

Auteurs et affiliations

  • Gutjahr Sylvain, UM2 (FRA)
  • Vaksmann Michel, CIRAD-BIOS-UMR AGAP (MLI) ORCID: 0000-0002-5258-1279
  • Dingkuhn Michaël, CIRAD-BIOS-UMR AGAP (PHL)
  • Thera Korothimi, IER (MLI)
  • Trouche Gilles, CIRAD-BIOS-UMR AGAP (FRA)
  • Braconnier Serge, CIRAD-BIOS-UMR AGAP (FRA)
  • Luquet Delphine, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-2543-7140

Source : Cirad - Agritrop (https://agritrop.cirad.fr/568950/)

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