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

• DOI: 10.1007/s00122-021-03797-z
• Publication Date: 2021-04-03T19:02:52Z
• Authors: Bonny Michael Oloka; Guilherme da Silv...; Victor A. Amankwaah; Marcelo Mollinari; Kenneth V. Pecota; Benard Yada; Bode A. Olukolu; Zhao-Bang Zeng; G. Craig Yencho
• Keywords: Ipomoea; Root-knot nematode; Plant biochemistry

Utilizing a high-density integrated genetic linkage map of hexaploid sweetpotato, we discovered major dominant QTL for root-knot nematode (RKN) resistance and modeled its effects. This discovery is useful development modern sweetpotato breeding program that utilizes marker-assisted selection genomic approaches faster gain RKN resistance. The [Meloidogyne incognita (Kofoid & White) Chitwood] causes significant storage root quality reduction yields losses in cultivated [Ipomoea batatas (L.) Lam.]. In this study, to was examined mapping population consisting 244 progenies derived from cross (TB) between 'Tanzania,' predominant African landrace cultivar with RKN, 'Beauregard,' an susceptible the USA. We performed quantitative trait loci (QTL) analysis using random-effect model on TB map. An bioassay incorporating potted cuttings each genotype conducted greenhouse replicated five times over period 10 weeks. For replication, inoculated ca. 20,000 eggs, galls were counted ~62 days after inoculation. Resistance progeny highly skewed toward resistant parent, exhibiting medium high levels identified one group 7, nature, which explained 58.3% phenotypic variation counts. work represents step forward our understanding architecture sets stage future utilization genomics-assisted programs.