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Chromosomal evolution withinPiperaceae

Abstract

Chromosome numbers for 26 different species of the generaPiper, Peperomia andPothomorphe (Piperaceae) are reported. The basic chromosome numbers are 2n = 26, x = 13 (Piper, Pothomorphe) and 2n = 22, x = 11 (Peperomia), polyploid series are characteristic forPiper andPeperomia. Piper has the smallest chromosomes and prochromosomal interphase nuclei,Peperomia the largest ones and mostly reticulate to euchromatic nuclei.Pothomorphe is intermediate in both characters. The karyomorphological differences betweenPothomorphe andPiper underline their generic separation. Interspecific size variation of chromosomes occurs inPiper andPeperomia. Infraspecific polyploidy was observed inPiper betle. C-banding reveals different patterns of heterochromatin (hc) distribution between the genera investigated. The genome evolution is discussed.

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Samuel, R., Morawetz, W. Chromosomal evolution withinPiperaceae . Pl Syst Evol 166, 105–117 (1989). https://doi.org/10.1007/BF00937879

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Key words

  • Angiosperms
  • Piperaceae
  • Piper
  • Pothomorphe
  • Peperomia
  • Chromosome numbers
  • karyomorphology
  • banding patterns
  • polyploidy
  • evolution and systematics in tropical plants