Abstract
Induction of embryogenic callus in culture is an important step in plant transformation procedures, but response is genotype specific and the genetics of the trait are not well understood. Quantitative trait loci (QTL) were mapped in a set of 126 recombinant inbred lines (RILs) of inbred H99 (high Type I callus response) by inbred Mo17 (low Type I callus response) that were evaluated over two years for Type I callus response. QTL were observed in a total of eleven bins on eight chromosomes, including eight QTL with main effects and three epistatic interactions. Many of the QTL were mapped to the same or bordering chromosomal bins as candidate genes for abscisic acid metabolism, indicating a possible role for the hormone in the induction of embryogenic callus, as has previously been indicated in microspore embryo induction. Further examinations of allelic variability for known candidate genes located near the observed QTL could be useful for expanding the understanding of the genetic basis of induction embryogenic callus. The QTL observed herein could also be used in a marker assisted selection (MAS) program to improve the response of agronomically useful inbreds, but only if the resources required for MAS are lower than those required for phenotypic selection.



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This journal paper of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, Project No. 3134, was supported by Hatch Act and State of Iowa funds and The R. F. Baker Center for Plant Breeding.
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Krakowsky, M.D., Lee, M., Garay, L. et al. Quantitative trait loci for callus initiation and totipotency in maize (Zea mays L.). Theor Appl Genet 113, 821–830 (2006). https://doi.org/10.1007/s00122-006-0334-y
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DOI: https://doi.org/10.1007/s00122-006-0334-y