Meiotic mutants of rye Secale cereale L. II. The nonhomologous synapsis in desynaptic mutants sy7 and sy10

We studied the expression and inheritance of two spontaneous mutations found in different populations of rye Secale cereale L. that cause high univalent frequency in meiosis and low fertility. Both mutations were inherited as monogenic recessives. For each of the mutations the corresponding gene sym...

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Bibliographic Details
Published in:Theoretical and applied genetics 1994-09, Vol.88 (8), p.1029-1036
Main Authors: Fedotova, Y.S, Bogdanov, Y.F, Gadzhiyeva, S.A, Sosnikhina, S.A, Smirnov, V.G, Mikhailova, E.I
Format: Article
Language:English
Subjects:
chiasmata
desynapsis
inheritance (genetics)
meiosis
mutants
mutation
recessive genes
Secale cereale
synapsis
synaptonemal complex
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Summary:We studied the expression and inheritance of two spontaneous mutations found in different populations of rye Secale cereale L. that cause high univalent frequency in meiosis and low fertility. Both mutations were inherited as monogenic recessives. For each of the mutations the corresponding gene symbols (sv7 and sv10) were suggested although their allelism has not been studied. These mutants differ in chiasma frequency and in the number of univalents per meiocyte. Electron microscopy of the whole-mount surface-spread synaptonemal complexes (SCs) from microsporocytes of both mutants revealed that during meiotic prophase I random synapsis began and progressed that involved not only homologous but also nonhomologous chromosomes. SCs were formed with frequent changes of pairing partners (switches) and intrachromosomal foldbacks of unpaired axial elements. As a result, incompletely synapsed, nonhomologous and multivalent SCs were formed in mutants by the stage analogous to pachytene in normal plants. In sy7 a maximum in the number of switches and foldbacks were observed at zygotene, whereas in sy10 this occurred at pachytene. We suggest that it is the process of recognition of homology that is impaired in both mutants. This leads to indiscriminate synapsis and prevents chiasma formation. Both mutants may be classified as desynaptic.
ISSN:0040-5752
1432-2242
DOI:10.1007/BF00220812