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G2MARS a collaborative approach to improve fodder quality of European sorghum germplasm

Devaud Q., Roldan D., Valente F., Fabre F., Alcouffe J., Jeanson P., Moreau P., Rami J.F., Trouche G., Pot D.. 2018. Milan : sorghum-id, 1 p.. European Sorghum Congress. 2, 2018-11-07/2018-11-08, Milan (Italie).

The ability of sorghum to maintain a high level of biomass production in stressful environments makes it an interesting crop for animal feed as fodder, and for biomaterials and bioenergy production. Sorghum hybrids with improved agronomical behavior and high biomass quality are being developed for the European market. However the development of such hybrids requires a lot of field testing and biomass analyses. The current marker assisted breeding strategies offer the possibilities to better understand the genetic architecture of biomass quality and accelerate the creation of improved varieties. The G2MARS design developed in the frame of the ¿Biomass For the Future¿ project is gathering the know-how of both private companies and publics institutes to deliver new genetic marker and improved germplasm for the European biomass market. Seven biparental connected populations were developed in both genetic pools (3 in the male, 3 in the female and one male-female populations). These populations involved elite commercial cultivars and high biomass quality sorghum landraces. A total of 964 hybrids from these 7 populations were characterized in 2016 and 2017 in 2 locations. Agronomical traits and biomass quality related traits were measured. A QTL detection taking advantage of the connected design was performed with MCQTL and allowed the detection of 17 and 6 QTL respectively in the male and female pools. For each QTL the parental alleles were ranked allowing to define 2 target molecular ideotypes. The crossing strategy aiming to combine the most efficiently the favorable alleles was defined using Optimas. The G2MARS project offered the opportunity to take advantage of the specific skills of both private and public partners and develop a joint breeding action do develop hybrids suitable to fit the expectations of the biomass value chains. IN addition, this design improved the understanding of the genetic architecture of biomass quality traits that was mobilized to optimize the recombination strategy. This work was supported by the Biomass For the Future project (ANR-11-BTBR-0006-BFF) funded by the French National Research Agency (ANR).

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