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Semisterile meiotic mutant sy11 with heterologous chromosome synapsis in rye Secale cereale L.

  • Plant Genetics
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Abstract

A study was made of the expression and inheritance of the sy11 mutation, which alters homologous chromosome synapsis in meiotic prophase I of rye. The abnormal phenotype proved to be determined by a recessive allele of a single sy11 gene. Univalents and multivalents were observed in homozygotes for the mutant allele. Analysis of the synaptonemal complex revealed a combination of homologous and nonhomologous synapsis in the mutant. The nonhomologous synapsis frequency significantly decreased in the course of meiotic prophase I in the mutant. The number of chiasmata per bivalent in metaphase I was 1.1 ± 0.01 versus 1.8 ± 0.01 in wild-type plants, and the number of univalents was 2.7 ± 0.06 versus 0.5 ± 0.05 in wild-type plants. As a result, a broad range of abnormalities was observed at subsequent stages of meiosis and led to the formation of defective microspores. Mutant plants were semisterile.

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Correspondence to S. V. Golubtsov.

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Original Russian Text © S.V. Golubtsov, S.P. Sosnikhina, I.V. Iordanskaya, A.V. Voilokov, E.I. Mikhailova, O.L. Kolomiets, Yu.F. Bogdanov, 2010, published in Genetika, 2010, Vol. 46, No. 6, pp. 774–781.

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Golubtsov, S.V., Sosnikhina, S.P., Iordanskaya, I.V. et al. Semisterile meiotic mutant sy11 with heterologous chromosome synapsis in rye Secale cereale L.. Russ J Genet 46, 682–688 (2010). https://doi.org/10.1134/S1022795410060086

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