Abstract
Quantitative trait loci (QTLs) controlling adventitious root formation (ARF) on the soil surface were evaluated under flooding conditions in 110 individuals of an F2 population derived from a cross between a dent inbred line ‘B64’ and a tropical Caribbean flint inbred line ‘Na4’. The ARF capacity of seedlings suggested the existence of continuous variation in the F2 population. The QTLs for ARF were located on chromosomes 3 (bin 3.07-8), 7 (bin 7.04-5) and 8 (bin 8.05). Alleles of line Na4, with a high capacity for ARF, increased ARF in the case of all the QTLs. By comparing chromosome positions of ARF loci in the B64 × Na4 population with those in a B64 × teosinte (Zea mays ssp. huehuetenangensis) population, the region conditioning ARF on chromosome 8 was consistent across the two populations. In the present study, overlap between the QTLs for ARF in the B64 × Na4 cross and QTLs for root traits measured in aerated hydroponic culture was also observed as reported in other mapping populations.
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