TY - CHAP AU - Cuesta-Marcos A. AU - Casas A.M. AU - van Eeuwijk F. AU - Lasa J.M. AU - Gracia M.P. AU - Igartua E. PY - 2008/// TI - Small cross mapping of flowering time determinants T2 - Cereal science and technology for feeding ten billion people: genomics era and beyond PB - Zaragoza : CIHEAM / IRTA VL - 81 T3 - Options Méditerranéennes : Série A. Séminaires Méditerranéens SP - 115-118 A2 - Christou P. A2 - Graner A. A2 - Jouve N. A2 - Keller B. A2 - Lasa J.M. A2 - Molina-Cano J.L. A2 - Royo C. A2 - Shewry P. A2 - Stanca A.M. A2 - Hammer K. A2 - Powell W. AB - Seventeen small populations of doubled haploid lines, from representative crosses of the Spanish public barley breeding program were used. The field trials consisted of three replications of two-row plots, 1m long, following a randomized complete block design. Heading date was recorded as the moment when 50 percent of the tillers exhibited 2 cm of protruding awns. We used 72 markers covering all the genome, specially the areas involved in flowering time, according to previous studies. Linked markers were used for the photoperiod gene Ppd-H2 and some earliness per se genes. Some spring x spring and winter x winter populations, for which no polymorphic markers were found in these regions, were genotyped with 8 more markers in chromosome 6H. A consensus map of the 17 populations was constructed using Joinmap 3.0. In a first step, individual markers were analyzed, with the marker main effect as a fixed term and the marker by population interaction as a random term. In the next step, multiple marker models were used, where all significant markers, but the marker that is being specifically analyzed, were included as co-factors. Rare alleles were not included in the analyses. N1 - Meeting of the Eucarpia Cereal Section, 2006/11/13-17, Lleida (Spain) UR - http://om.ciheam.org/om/pdf/a81/00800817.pdf ER -