Experimental evidence on the affinities ofPapaver somniferum (Papaveraceae) |
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Authors: | Joachim W Kadereit |
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Institution: | (1) Institut für systematische Botanik und Pflanzengeographie, Im Neuenheimer Feld 328, D-6900 Heidelberg, Germany |
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Abstract: | Results obtained from crossing experiments betweenP. somniferum subsp.somniferum (2n = 22) and subsp.setigerum (2n = 44),P. glaucum (2n = 14) andP. gracile (2n = 14) and from the observation of meiotic chromosome pairing in the various hybrids obtained do not provide straightforward evidence for the hypothesis thatP. somniferum originated as a triploid hybrid between taxa similar toP. glaucum andP. gracile (Kadereit 1986a, b).—On the one hand, the pattern of crossability found reflects the closer similarity of subsp.somniferum toP. glaucum and of subsp.setigerum toP. gracile, which was interpreted as segregation of parental characters, and the high frequency of 2n = 28 chromosomes among F2-progeny from the hybrid subsp.somniferum × subsp.setigerum (2n = 33) might reveal n = 7 as the base number also ofP. somniferum. On the other hand, however, the general difficulty of obtaining hybrids, and the low incidence of bivalent formation in their meiosis, probably indicating a lack of chromosome homology between the different species, do not fit the above hypothesis.—These results are in marked contrast to the morphological similarity between the three species involved. |
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Keywords: | Angiosperms Papaveraceae Papaver somniferum subsp somniferum subsp setigerum P glaucum P gracile Triploidy crossing relationships meiotic chromosome pairing F2 chromosome number segregation |
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