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A quantitative trait locus involved in maize yield is tightly associated to the r1 gene on the long arm of chromosome 10
Authors:Roberto Pilu  Andrea Bucci  Laura Casella  Chiara Lago  Francesco Cerino Badone  Elena Cassani  Michela Landoni
Institution:1. Dipartimento di Produzione Vegetale, Universit?? degli Studi di Milano, Via Celoria 2, 20133, Milan, Italy
2. Dipartimento di Scienze Biomolecolari e Biotecnologie, Universit?? degli Studi di Milano, Via Celoria 26, 20133, Milan, Italy
Abstract:We produced and studied for 3?years two synthetic populations of maize differing in their constitution only for the selected alleles present at the red color 1 (r1) locus (R-sc vs. r?Cr). r1 is a regulatory gene conferring anthocyanin pigmentation in different tissues: the R-sc allele confers pigmentation only in the aleurone seed layer, while the r?Cr allele confers pigmentation in several tissues such as root, silk and anther but the seed is colourless. The colourless population (r?Cr/r?Cr) was characterized by improved agronomic features, such as ear weight and plant height, compared with the R-sc/R-sc coloured population. This finding was confirmed by studying single F4 R/r families where the presence of the r?Cr allele conferred positive features, acting as a dominant trait. Quantitative trait locus (QTL) analysis performed using molecular markers on the long arm of chromosome 10 (bin 10.06), where the r1 gene maps, identified a QTL map position for plant height tightly associated to the r1 gene. Thus the r1 gene may represent a major QTL or it could be closely linked to another gene involved in the agronomic performance of the two populations studied.
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