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Evaluating Linear and Non-linear Genotype–Environment Interactions in Pearl Millet

  • E. A. Abdalla
  • D. S. VirkEmail author
  • F. A. Abera
Research Article
  • 33 Downloads

Abstract

The nature of genotype–environment (GE) interactions was investigated for two F1 hybrids and eight open pollinated varieties (OPVs) of pearl millet for grain yield in 12 environments spread over 2 years (2010 and 2011) across the pearl millet growing belt of Sudan. The joint regression analysis showed significant linear and non-linear GE interactions corresponding to heterogeneity and remainder mean squares. However, the GE interactions of all genotypes except PGO9PM1 were explained by the linear regression model. Six OPVs and hybrid PGO9PM3 showed general adaptation with b ≈ 1.0 and non-significant remainder mean squares. Of these genotypes, while hybrid PMO9PM3 was the highest yielding (917 kg ha−1) farmers could adopt any genotype by trading off between their desirable traits such as mean grain yield, earliness, fodder yield and quality criteria etc. Two varieties (ISC-III and MCNELC), were specifically adapted to below average environments with their mean grain yields non-significantly different from the other six OPVs. The highest yielding hybrid PMO9PM1, on the other hand, showed specific adaptation to favourable environments but also had large remainder mean squares. More complex models such as quadratic, 2-intersecting-straight lines, 3-intersecting-straight lines were fitted which, however, could not account for the large remainder mean squares. A 3-lines model with quadratic component in the higher yielding segment of environments was found adequate showing that the upper threshold value for the hybrid was not reached and it would continue responding to higher yielding environments.

Keywords

Pearl millet Genotype–environment interactions Non-linear interactions Quadratic regression Intersecting-lines regression 

Notes

Acknowledgements

The authors are thankful to the Agricultural Research Corporation for the overall support provided, and to the Practical Action, Sudan and the Arab Sudanese Seed Company for financial provisions. Thanks are also to Ahmed Abuhurra for his help in trials in North and South Kordofan States. The cooperation of all researchers and technical staff at Gezira, Gadarif, Alfashir and Niyala Research Stations during experimentation is highly appreciated.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© The National Academy of Sciences, India 2017

Authors and Affiliations

  1. 1.Elobeid Research StationEl-ObeidSudan
  2. 2.School of Environment, Natural Resources and Geography (SENRGY)Bangor UniversityBangorWales, UK
  3. 3.Institute of Environment, Gender and Development Studies (IEGDS)Mekelle UniversityTigrayEthiopia

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