Semisterile meiotic mutant <Emphasis Type="Italic">sy11</Emphasis> with heterologous chromosome synapsis in rye <Emphasis Type="Italic">Secale cereale</Emphasis> L. |
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| Authors: | S V Golubtsov S P Sosnikhina I V Iordanskaya A V Voilokov E I Mikhailova O L Kolomiets Yu F Bogdanov |
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| Institution: | (1) Female Germ Cell Biology Group, Department of Clinical Studies, University of Pennsylvania, New Bolton Center, 382 West Street Road, Kennett Square, PA 19348, USA;(2) Department of Animal Biology, Center for Animal Transgenesis and Germ Cell Research, University of Pennsylvania, New Bolton Center, 382 West Street Road, Kennett Square, PA 19348, USA;(3) Section of Reproduction, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, New Bolton Center, 382 West Street Road, Kennett Square, PA 19348, USA;(4) Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, 501 D.W. Brooks Drive, Athens, GA 30605, USA; |
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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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