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Communication Dans Un Congrès Année : 2022

Drought response QTLs detected on phenotypic ratios contribute to the genotype x environment interaction.

Résumé

Drought stress can considerably affect maize yields, which is a source of concern for maintaining global food security in the coming years. Identification of quantitative traits loci (QTLs) involved in the genotype x environment interaction (GxE) is a way to increase maize resilience to drought through marker-assisted breeding or candidate gene identification. However, these QTLs generally have low effects, which make them difficult to detect. We hypothesized that computing ratios from phenotypic values measured in two contrasted watering conditions would help in identifying QTLs involved in GxE interaction that would not be detected when considering each condition separately. To test this hypothesis, we used previously published data containing phenotypic measurements for six drought-responsive ecophysiological traits acquired on 254 maize hybrids grown under two watering conditions, well-watered (WW) and water deficit (WD), in four greenhouse experiments (Prado et al., 2018). We conducted a genome wide association study on the trait values obtained in each watering condition as well as on the WD/WW ratios, taking into account an effect of the experiment. A total of 140 QTLs were detected, 102 (73%) were detected in one of the two watering conditions and 38 (27%) were detected only on the ratios. We quantified the contribution of the detected QTLs to the variations of the traits by fitting statistical mixed models including fixed effects of the QTLs and random effects of the genotype, genotype x condition interaction and genotype x experiment interaction. This showed that the QTLs detected in each watering condition mostly contributed the genotype variation (39%-65% of the variance captured depending on the trait) while the QTLs detected only for the ratios mainly contributed to the genotype x condition interaction (69%-100% of the variance captured). Altogether, these results show that ratio-specific QTLs are complementary to the QTLs detected in each condition separately and are worth being considered to explain the GxE interaction.
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Dates et versions

hal-03879700 , version 1 (30-11-2022)

Identifiants

  • HAL Id : hal-03879700 , version 1

Citer

Yacine Djabali, Renaud Rincent, Marie-Laure Martin-Magniette, Melisande Blein-Nicolas. Drought response QTLs detected on phenotypic ratios contribute to the genotype x environment interaction.. XXVth EUCARPIA Maize and Sorghum Conference, May 2022, Belgrade, Serbia. ⟨hal-03879700⟩
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