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Vrn-D4 is a vernalization gene located on the centromeric region of chromosome 5D in hexaploid wheat

  • Author(s): Yoshida, T
  • Nishida, H
  • Zhu, J
  • Nitcher, R
  • Distelfeld, A
  • Akashi, Y
  • Kato, K
  • Dubcovsky, J
  • et al.
Abstract

Natural variation in wheat requirement of long exposures to cold temperatures to accelerate flowering (vernalization) is mainly controlled by the Vrn-1, Vrn-2, Vrn-3, and Vrn-4 loci. The first three loci have been well characterized, but limited information is available for Vrn-4. So far, natural variation for Vrn-4 has been detected only in the D genome (Vrn-D4), and genetic stocks for this gene are available in Triple Dirk (TDF, hereafter). We detected heterogeneity in the Vrn-1 alleles present in different TDF stocks, which may explain inconsistencies among previous studies. A correct TDF seed stock from Japan carrying recessive vrn-A1, vrn-B1, and vrn-D1 alleles was crossed with three different winter cultivars to generate F2 mapping populations. Most of the variation in flowering time in these three populations was controlled by a single locus, Vrn-D4, which was mapped within a 1.8cM interval flanked by markers Xcfd78 and Xbarc205 in the centromeric region of chromosome 5D. A factorial ANOVA for heading time using Vrn-D4 alleles and vernalization as factors showed a significant interaction (P<0.0001), which confirmed that the Vrn-D4 effect on flowering time is modulated by vernalization. Comparison of the different Triple Dirk stocks revealed that Vrn-B1, Vrn-D1, and Vrn-D4 all have a small residual response to vernalization, but Vrn-D4 differs from the other two in its response to short vernalization periods. The precise mapping and characterization of Vrn-D4 presented here represent a first step toward the positional cloning of this gene. © Springer-Verlag 2009.

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