Abstract
The meiosis of the diploidPaeonia tenuifola and the allotetraploidP. officinalis was studied after conventional methanol/acetic acid-fixation and synaptonemal complex (SC) spreading. Meiosis inP. tenuifolia (2n = 10) is normal with five bivalents in metaphase I, and the SCs in pachytene show regular features. InP. officinalis (2n = 4x = 20) univalents, bivalents and multivalents are found in metaphase I. The SCs reveal several abnormalities: a high number of unpaired lateral elements, partner exchanges between three and four lateral elements, loops and lateral element thickenings. These characteristics are compared with the situations found in other polyploid and hybrid species. It is noteworthy that the abnormalities in meiosis ofP. officinalis are not reflected in its somatic karyotype. Its features were analysed after silver staining and fluorescent staining with chromomycin and compared with those ofP. tenuifolia.
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Synaptonemal Complex Spreading in Plants2; for part1 see Pl. Syst. Evol.154, 129–136 (1986).
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Schwarzacher-Robinson, T. Meiosis, SC-formation, and karyotype structure in diploidPaeonia tenuifolia and tetraploidP. officinalis . Pl Syst Evol 154, 259–274 (1986). https://doi.org/10.1007/BF00990128
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DOI: https://doi.org/10.1007/BF00990128