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High-resolution cytological mapping of the long arm of chromosome 5A in common wheat using a series of deletion lines induced by gametocidal (Gc) genes of Aegilops speltoides

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Abstract

Gametocidal (Gc) genes of Aegilops in the background of the wheat genome lead to breakage of wheat chromosomes. The Q gene of wheat was used as a marker to select 19 deletion lines for the long arm of chromosome 5A of common wheat, Triticum aestivum cv. Chinese Spring (CS). The extents of deleted segments were cytologically estimated by the C-banding technique. The DNAs of deletion lines were hybridized with 22 DNA probes recognizing sites on the long arm of the chromosome (5AL) to determine their physical order. Based on the breeding behavior of the deletion lines, the location of a novel gene (Pv, pollen viability) affecting the viability of the male gamete was deduced. The segment translocated from 4AL to 5AL in CS was cytologically estimated to represent 13% of the total length of 5AL. Although DNA markers were almost randomly distributed along the chromosome arm, DNA markers located around the centromere and C-banded regions were obtained only rarely. Some deletion lines were highly rearranged in chromosome structure due to the effect(s) of the Gc gene. Applications of Gc genes for manipulating wheat chromosomes are discussed.

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Author information

Correspondence to Yasunari Ogihara.

Additional information

Communicated by R.G. Herrmann

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Ogihara, Y., Hasegawa, K. & Tsujimoto, H. High-resolution cytological mapping of the long arm of chromosome 5A in common wheat using a series of deletion lines induced by gametocidal (Gc) genes of Aegilops speltoides . Molec. Gen. Genet. 244, 253–259 (1994). https://doi.org/10.1007/BF00285452

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Key words

  • Gametocidal genes
  • Chromosome deletion
  • Cytological map of common wheat
  • DNA markers
  • Structural analysis of chromosome rearrangements