Association between COL1 and Flowering Time in Brassica nigra: Replication, Validation, and Genotypic Disequilibrium
2008 (English)In: International journal of plant sciences, ISSN 1058-5893, Vol. 169, no 9, 1229-1237 p.Article in journal (Refereed) Published
Previously we showed in a limited set of populations that polymorphism at a biallelic indel, Ind2, located within the BniCOL1 gene of Brassica nigra (Bni), was associated with variation in flowering time. Plants that were homozygotes for the short allele flowered early, whereas homozygotes for the long allele flowered late, and the heterozygotes were intermediate. We genotyped individuals from 24 populations that were representative of the current distribution of B. nigra at Ind2 as well as at four adjacent polymorphisms, and we assessed the relationship between polymorphism at these markers and variation in flowering time. The 24 populations comprise populations for which a significant association was previously observed, hence allowing independent replication. Other populations did not overlap with those studied initially and therefore allow validation of the previous results. The presence of a significant relationship between polymorphism at Ind2 and flowering time variation was replicated, but we mostly failed to validate the relationship. Genotypic disequilibrium around Ind2 was extensive, and consequently, polymorphism at markers located in the intergenic space between BniCOL1 and BniCOa was also associated with flowering time in the same populations. All populations from India and Ethiopia had limited polymorphism at all five loci and were fixed for the short allele at Ind2, and all but one flowered early. Our data confirm the involvement of this genomic area in the control of flowering time, but inconsistent results in some of the populations suggest that the relationship between polymorphism in the BniCOL1-BniCOa genomic area and flowering time is not a simple one.
Place, publisher, year, edition, pages
2008. Vol. 169, no 9, 1229-1237 p.
Brassica nigra, flowering time, CONSTANS, indel, association mapping, linkage disequilibrium
IdentifiersURN: urn:nbn:se:uu:diva-107049DOI: 10.1086/591989ISI: 000261002700009OAI: oai:DiVA.org:uu-107049DiVA: diva2:227608