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Genes in diploid triticinae compensating for the low temperature regulating gene Ltp in chromosome 5D of Triticum aestivum

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Summary

Hybrids of Triticum aestivum (monosomic 5D or ditelosomic 5DL) x T. speltoides (= Ae. speltoides) showed that the genotype of T. speltoides carries gene(s) which can partially compensate for the expected decrease in chromosome association at low temperatures (10°C) in the absence of chromosome 5D. In hybrids of T. aestivum (normal, ditelosomic 3DL or ditelosomic 3DL-monosomic 5D) x T. longissimum (= Ae. sharonensis), this compensation was not observed.

In normal F1 hybrids of T. durum x T. longissimum partial chromosome association occurred at 10°C and this stabilizer effect may be explained by the presence of a Ltp-like gene on chromosome 5A. When a line of T. durum carrying a homozygous translocated 5B-5D chromosome was used in the crosses an even higher chromosome association was observed.

These results suggest either the existence of a promoter gene for chromosome association in the 5D translocated segment or the loss of a weak suppressor gene in the removed segment of 5B. It was concluded that the translocated 5D segment did not carry the Ltp stabilizer gene.

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Authors and Affiliations

  1. Instituto Gulbenkian de Ciência, Oeiras, Portugal

    W. S. Viegas

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  1. W. S. Viegas
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Communicated by R. Riley

The work was supported by a fellowship of the Gulbenkian Foundation and partly carried out while the author was at the Department of Genetics, Agricultural University, Wageningen, The Netherlands.

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Viegas, W.S. Genes in diploid triticinae compensating for the low temperature regulating gene Ltp in chromosome 5D of Triticum aestivum . Theoret. Appl. Genetics 55, 205–208 (1979). https://doi.org/10.1007/BF00268114

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  • DOI: https://doi.org/10.1007/BF00268114

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