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/ Cyril Diatta
Crop Protection, N°119. Development of sorghum hybrids for stable yield and resistance to grain mold for the Center and South-East of Senegal [texte imprimé] / Cyril Diatta, Auteur ; Thierry Klanvi Tovignan, Auteur ; Hubert Adoukounou-Sagbadja, Auteur . - [S.l.] : Elsevier Ltd, 2019 . - pp.197-207 : tabl., graph., fig. ISSN : ISSN: 0261-2194 https://doi.org/10.1016/j.cropro.2019.02.001
Langues : Anglais ( eng) Catégories : | SCIENCES ET PRODUCTIONS VEGETALES
| Mots-clés : | Sorghum hybrids
Grain yield
Mold tolerance
GxE interactions
GGE biplot | Index. décimale : | F313- Variation des caractères: Genotype , phenotype, caractère physiologique, vigueur, adaptation | Résumé : | Panicle mold infestation is reported to cause 30–100% yield loss in sorghum. Therefore, breeding for mold
resistance becomes a necessity. Due to difficulties in predicting genotype by environment interactions (GxE),
multi-location tests are required in the breeding process to identify high-yielding and stable genotypes across
environments. The present study aimed at assessing the performance and stability for yield and resistance to
grain mold of five local sorghum hybrids evaluated over five years across four locations in the Center and South-
East regions of Senegal. The combined ANOVA showed a strong effect of year, genotype and location on the days
to anthesis, plant height, grain yield components and panicle grain mold rating score. The GxE interaction was
significant for grain yield but not for panicle mold infestation. Year x location explained 25% of total variation of
grain yield while year and location explained 22% and 19% respectively. With regard to panicle grain mold
infestation, year explained 32% of total variation followed by year by location (29%), genotype (7%) and
location (6%). Although year and location better explained the variation for the traits, broad-sense heritability
was high, indicating a possibility to improve these traits through selection. For most of the traits, the hybrids had
higher performance compared to the parental lines used as check, showing an expression of heterosis. The GGE
biplot approach was used to identity hybrids with high performance and stability. Hence, hybrid G4 followed by
G2 and G3, were the best in terms of yield performance and stability. Moreover, location STM15 followed by
DAR15 were the best closest to an ideal location. Overall, G5 was pointed out as the best hybrid combining grain
yield and mold tolerance across years and locations. These results in addition to providing details on the performance
and stability of the five sorghum hybrids helped to identify the best hybrids to be released and
disseminated in the Center and South-East regions of Senegal. |
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