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

Semisterile meiotic mutant sy11 with heterologous chromosome synapsis in rye Secale cereale L. 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. Russian Journal of Genetics Springer Journals

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

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SP MAIK Nauka/Interperiodica
Copyright © 2010 by Pleiades Publishing, Ltd.
Biomedicine; Microbial Genetics and Genomics; Animal Genetics and Genomics; Human Genetics
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