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Journal of Experimental Botany, Vol. 52, No. 362, pp. 1857-1864, September 1, 2001
© 2001 Oxford University Press

Original Papers

QTL analysis of photosynthesis and water status traits in sunflower (Helianthus annuus L.) under greenhouse conditions

Delphine Hervé, Françoise Fabre, Ericka Flores Berrios, Nadia Leroux, Ghias Al Chaarani, Claude Planchon, Ahmad Sarrafi and Laurent Gentzbittel1

Laboratoire de Biotechnologie et Amélioration des Plantes, INP/ENSAT, Pôle de Biotechnologie Végétale, Chemin de Borde-Rouge, Auzeville, BP107, F-31326 Castanet-Tolosan cedex, France

The identification of QTL for several physiological traits in sunflower is described. Traits related to photosynthesis (leaf chlorophyll concentration, net photosynthesis and internal CO2 concentration) and water status (stomatal conductance, transpiration, predawn leaf water potential, and relative water content) were evaluated in a population of recombinant inbred lines under greenhouse conditions. Narrow-sense heritabilities were low to average. Using an AFLP linkage map, 19 QTL were detected explaining 8.8–62.9% of the phenotypic variance for each trait. Among these, two major QTL for net photosynthesis were identified on linkage group IX. One QTL co-location was found on linkage group VIII for stomatal movements and water status. Coincident locations for QTL regulating photosynthesis, transpiration and leaf water potential were described on linkage group XIV. These results lead to the first description of the organization of genomic regions related to yield in sunflower.

Key words: Helianthus annuus, recombinant inbred lines, gas exchange, water potential, chlorophyll content.


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