Title: The effect on meiotic synapsis of a recombination modulator in <i>Petunia hybrida</i>
Abstract: In Petunia hybrida, a major gene called Rm 1 is able to induce a considerable increase in the meiotic recombination rates. To monitor the effect of Rm 1 on meiotic synapsis, synaptonemal complex (SC) formation was investigated in pollen mother cells of Rm 1 Rm 1 and rm 1 rm 1 plants. Three-dimensional serial-section reconstruction showed no morphological difference in their SC structure. In two-dimensional spreading nuclei, although extensive SC formation was observed in the absence of Rm 1 , our observations strongly suggest that SC formation is more regular and more efficient in the presence of Rm 1 . SC analysis showed that the reduced chiasma frequency observed in rm 1 rm 1 plants corresponds to a partial failure of synapsis involving chromosome ends, pericentric regions, and may also extend to the whole length of short chromosome arms. It is proposed that Rm 1 probably corresponds to a regulatory system with multiple effects, including the course of synapsis and the extent and quality of SC formation.Key words: synaptonemal complex, synapsis, chiasma, recombination modulator gene, petunia.
Publication Year: 1992
Publication Date: 1992-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 7
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