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Identification of AFLP markers in soybean linked to resistance to Meloidogyne javanica and conversion to Sequence Characterized Amplified Regions (SCARs)

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Abstract

Meloidogynejavanica is the most widely spread nematode pest on soybean in SouthAfrica. Only a few registered commercial South African cultivars are poor hostsof this nematode species and there is an urgent need for an efficient breedingprogramme for resistant cultivars of all maturity groups. However, breeding ishampered by laborious screening procedures for selection of poor host cultivarsand/or lines. The objective of this study was to develop an economically viablemolecular marker system for application in selection procedures. BothRestriction Fragment Length Polymorphism (RFLP) and Amplified Fragment LengthPolymorphism (AFLP) screening techniques identified markers linked togall-indexvariation in a segregating population of 60 F2 progeny from a crossbetween a resistant cultivar (Gazelle) and a highly susceptible variety(Prima).A codominant RFLP marker( B212) was linked significantly to M.javanica resistance and explained 62% of the variation ingall-index.Seven AFLP markers were linked significantly to the resistance trait, of whichfour were linked in repulsion phase and three in coupling phase. All seven AFLPmarkers mapped to LG-F (Linkage Group F) on the public soybean molecular map.The major quantitative trait locus (QTL) for resistance mapped between markersE-ACC/M-CTC2(SOJA6) (linked in coupling phase), B212 and E-AAC/M-CAT1(SOJA7)(linked in repulsion phase). These two AFLP markers bracketing the majorresistance QTL were successfully converted to SCARs (Sequence CharacterizedAmplified Regions). Marker E-ACC/M-CTC2 was converted to a codominant SCARmarker SOJA6, which accounted for 41% of variation in gall-index in the mappingpopulation. Marker E-AAC/M-CAT1 was converted to a dominant SCAR marker (SOJA7)and explained 42% of gall-index variation in the mapping population. These twomarkers mapped approximately 3.8 cM and 2.4 cMrespectively from the resistance QTL. This study represents the first report ofthe development of PCR-based sequence specific markers linked to M.javanica resistance in soybean.

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Mienie, C., Fourie, H., Smit, M. et al. Identification of AFLP markers in soybean linked to resistance to Meloidogyne javanica and conversion to Sequence Characterized Amplified Regions (SCARs). Plant Growth Regulation 37, 157–166 (2002). https://doi.org/10.1023/A:1020585023976

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