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Euphytica

, 215:211 | Cite as

Breeding new sweetpotato genotypes combining elevated content of two antagonistic traits of high dry matter and beta-carotene content in a high root yield background

  • Solomon O. AfuapeEmail author
  • Pangirayi B. Tongoona
  • Isaac K. Asante
  • Chiedozie N. Egesi
  • Grace Nwaigwe
  • Samuel K. Offei
Article
  • 29 Downloads

Abstract

This study was embarked upon to stack two key but inversely associated sweetpotato traits (dry matter and beta-carotene content) through conventional breeding methods. Thirty-seven elite sweetpotato genotypes were evaluated for both traits, and 15 parents comprising five orange-, five yellow- and five white-fleshed genotypes were selected from the 37 for hybridization. Using bi-parental mating fashion, an F1 progeny population for both traits was developed. Of the 13 families developed, eight families had above 30% of the progenies made of orange-fleshed (high beta-carotene) genotypes with three families having at least 50% of the progenies as OFSP. All the families (except two) showed wide variation for beta-carotene content (range 0.15–12.39 mg/100gFW) with some progenies exhibiting transgressive segregation. For dry matter content, most of the progenies across families had dry matter content > 30%. Overall, 17 high yielding F1 genotypes that combined elevated beta-carotene and dry matter content were identified. These 17 genotypes showed that although a strong inverse relationship exists between dry matter and beta-carotene, the relationship does not make the development of genotypes expressing both traits totally impossible through conventional breeding. These 17 superior genotypes that combine both traits will also serve as elite genetic background for many African sweetpotato breeding platforms in their quest to develop OFSP genotypes that meet the food culture of many African societies.

Keywords

Sweetpotato Germplasm evaluation OFSP development Dry matter Beta-carotene F1 progenies 

Notes

Acknowledgements

This study was part of the PhD Thesis research awarded the first author by the West African Centre for Crop Improvement (WACCI), University of Ghana, Legon PhD Fellowship Program, and with the financial assistance from the Alliance for Green Revolution in Africa (AGRA). Dr. Edward Carey and Dr. Robert Mwanga of the International Potato Center are acknowledged for their immense guidance during the research phase. The Management of the National Root Crops Research Institute, Umudike, Nigeria, and the entire Staff of the Sweetpotato Program of the Institute are appreciated for their help during the field trials.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.National Root Crops Research Institute, UmudikeUmuahiaNigeria
  2. 2.West Africa Centre for Crop ImprovementUniversity of GhanaLegonGhana
  3. 3.International Institute of Tropical AgricultureIbadanNigeria

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