Molecular and General Genetics MGG

, Volume 244, Issue 4, pp 352–359

Genome analysis of the moss Physcomitrella patens (Hedw.) B.S.G.


  • Ralf Reski
    • Institut für Allgemeine Botanik
  • Merle Faust
    • Institut für Allgemeine Botanik
  • Xiao-Hui Wang
    • Institut für Allgemeine Botanik
  • Michael Wehe
    • Institut für Allgemeine Botanik
  • Wolfgang O. Abel
    • Institut für Allgemeine Botanik
Original Paper

DOI: 10.1007/BF00286686

Cite this article as:
Reski, R., Faust, M., Wang, X. et al. Molec. Gen. Genet. (1994) 244: 352. doi:10.1007/BF00286686


A wild-type (WT) strain of the moss Physcomitrella patens (Hedw.) B.S.G., two mutants derived from it (PC22 and P24), and a somatic hybrid, PC22(+)P24, were analysed. Staining of metaphases revealed 54±2 chromosomes in the somatic hybrid and 27 chromosomes in the wild type and the two mutants. Using flow cytometry (FCM), DNA contents were calculated to be 0.6 pg (WT, PC22), 1.2 pg (P24), and 1.6 pg (PC22(+)P24) per nucleus, respectively. Southern hybridization provided evidence for at least one family of highly repetitive DNA and, furthermore, revealed different amounts of repetitive DNA in the four genotypes. However, these sequences cannot account for the 100% increase in the nuclear DNA amount in mutant P24, relative to wild type. In FCM analyses every moss geno-type generated just one single peak of fluorescence, indicating an arrest in the cell cycle during the daytime. Thermal denaturation of wild-type DNA revealed a G+C content of 34.6% for total DNA and 38.6% for plastid DNA. A cDNA library of 1.2 × 106 independent clones was established, from which sequences homologous to cab and rbcS, respectively, were isolated. These genes show significant homologies to those of higher plants, and, likewise, comprise multigene families. No restriction fragment length polymorphisms could be detected between the four moss genotypes using these cDNA probes.

Key words

ArchegoniateDifferentiation mutantPlant nuclear DNARepetitive DNASomatic hybrid

Copyright information

© Springer-Verlag 1994