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Open Access item Copy Number Variation Affecting the Photoperiod-B1 and Vernalization-A1 Genes Is Associated with Altered Flowering Time in Wheat (Triticum aestivum)
Turner, Adrian S.
Laurie, David A.
|Keywords:||Pseudo-Response-Regulator, Arabidopsis-Thaliana, Freezing Tolerance, Polyploid Wheat, Genome, Barley, Population, PPD-B1|
|Publisher:||Public Library of Science|
|Citation:||Plos One 7/3: e33234|
|Abstract:||The timing of flowering during the year is an important adaptive character affecting reproductive success in plants and is
critical to crop yield. Flowering time has been extensively manipulated in crops such as wheat (Triticum aestivum L.) during
domestication, and this enables them to grow productively in a wide range of environments. Several major genes
controlling flowering time have been identified in wheat with mutant alleles having sequence changes such as insertions,
deletions or point mutations. We investigated genetic variants in commercial varieties of wheat that regulate flowering by
altering photoperiod response (Ppd-B1 alleles) or vernalization requirement (Vrn-A1 alleles) and for which no candidate
mutation was found within the gene sequence. Genetic and genomic approaches showed that in both cases alleles
conferring altered flowering time had an increased copy number of the gene and altered gene expression. Alleles with an
increased copy number of Ppd-B1 confer an early flowering day neutral phenotype and have arisen independently at least
twice. Plants with an increased copy number of Vrn-A1 have an increased requirement for vernalization so that longer
periods of cold are required to potentiate flowering. The results suggest that copy number variation (CNV) plays a
significant role in wheat adaptation.|
|Publisher version (URL):||http://dx.doi:10.1371/journal.pone.0033234|
|Appears in Collections:||(IBMCP) Artículos|
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