Multienvironment Evaluation of Tannin-Free Photoperiod-Insensitive Sorghum (Sorghum bicolor (L) Moench) for Yield and Resistance to Grain Mold in Senegal
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
Hindawi
Abstract
Combining resistance to grain mold with high grain yield in tannin-free white-grained photoperiod-insensitive sorghum is of major
interest for farmers in Senegal. In this study, GGE biplot analysis was used to assess the performance, adaptability, and stability of
eleven sorghum parental lines and their hybrid combinations for yield and grain mold resistance under Senegalese environments.
Eleven inbred lines along with their 22 hybrid combinations and one check were evaluated across three sites during the 2015 and 2016
rainy seasons under natural grain mold infestation. (e results of this study showed strong genetic variability among studied
genotypes for all measured traits. (e highly significant G× E interaction effects for grain yield and panicle grain mold rating score
(PGMR) indicated that both traits are influenced by genetics and to some extent by environment. Broad-sense heritability computed
was high for all these traits except PGMR, showing a high environmental pressure on this later. (e study showed that grain mold
pressure in the studied sites decreased following a South-North gradient similar to the rainfall pattern, with the south region wetter,
explaining the high disease pressure in Darou and Sinthiou Maleme contrary to Bambey. (e GGE biplot analysis performed showed
that the first two principal components explained 85.84% of the total variation of GGE sum of squares for grain yield. (e which won-where view of the GGE biplot for grain yield showed that the hybrid HB16 was the most adapted for Bambey area. (e ranking
of genotypes based on both yield performance and stability showed that HB16, HB5, HB21, HB18, and HB7 were the best hybrids
combining high grain yield, high stability performance, and tolerance to grain mold disease across the test environments. (These
hybrids outperformed the best yielding inbred line P29 (2196.7 kg ha−1
) with grain yield advantages ranging 17–60%. (erefore, these
hybrids could be recommended to farmers in order to improve sorghum yield in Senegal.
Description
Research Article