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Discovery of a major QTL for root-knot nematode (Meloidogyne incognita) resistance in cultivated sweetpotato (Ipomoea batatas)

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Title Discovery of a major QTL for root-knot nematode (Meloidogyne incognita) resistance in cultivated sweetpotato (Ipomoea batatas)
 
Creator Oloka, B.M.
Silva Pereira, G. da
Amankwaah, V.A.
Mollinari, M.
Pecota, K.V.
Yada, B.
Olukolu, B.A.
Zeng, Z.B.
Craig Yencho, G.
 
Subject meloidogyne incognita
roots
quantitative trait loci
ipomoea batatas
genetics
sweet potatoes
 
Description The root-knot nematode [Meloidogyne incognita (Kofoid & White) Chitwood] (RKN) causes significant storage root quality reduction and yields losses in cultivated sweetpotato [Ipomoea batatas (L.) Lam.]. In this study, resistance to RKN was examined in a mapping population consisting of 244 progenies derived from a cross (TB) between ‘Tanzania,’ a predominant African landrace cultivar with resistance to RKN, and ‘Beauregard,’ an RKN susceptible major cultivar in the USA. We performed quantitative trait loci (QTL) analysis using a random-effect QTL mapping model on the TB genetic map. An RKN bioassay incorporating potted cuttings of each genotype was conducted in the greenhouse and replicated five times over a period of 10 weeks. For each replication, each genotype was inoculated with ca. 20,000 RKN eggs, and root-knot galls were counted ~62 days after inoculation. Resistance to RKN in the progeny was highly skewed toward the resistant parent, exhibiting medium to high levels of resistance. We identified one major QTL on linkage group 7, dominant in nature, which explained 58.3% of the phenotypic variation in RKN counts. This work represents a significant step forward in our understanding of the genetic architecture of RKN resistance and sets the stage for future utilization of genomics-assisted breeding in sweetpotato breeding programs.
 
Date 2021-07
2021-09-11T01:59:37Z
2021-09-11T01:59:37Z
 
Type Journal Article
 
Identifier Oloka, B. M., da Silva Pereira, G., Amankwaah, V. A., Mollinari, M., Pecota, K. V., Yada, B., Olukolu, B. A., Zeng, Z. B., & Craig Yencho, G. (2021b). Discovery of a major QTL for root-knot nematode (Meloidogyne incognita) resistance in cultivated sweetpotato (Ipomoea batatas). Theoretical and Applied Genetics. ISSN 1432-2242. 134(7). 1945–1955.
1432-2242
https://hdl.handle.net/10568/114950
https://doi.org/10.1007/s00122-021-03797-z
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 1945–1955
 
Publisher Springer Science and Business Media LLC
 
Source Theoretical and Applied Genetics volume