SOME OBSERVATIONS ON F2 AND BACKCROSS PLANTS DERIVED FROM HYBRIDS BETWEEN PAPAVER DUBIUM L. AND P. LECOQII LAM.

Authors

  • M. O. HUMPHREYS

    Corresponding author
    1. Department of Genetics, University of Birmingham, Birmingham B15 2TT
      *Present address: Department of Botany, University of Liverpool, Liverpool L693BX.
    Search for more papers by this author

  • *Present address: Department of Botany, University of Liverpool, Liverpool L693BX.

SUMMARY

Plants of the F2 and backcross generations derived from F1 hybrids between Papaver dubium L. (2n= 42) and P. lecoqii Lam. (2n= 28) were studied. It was deduced from the chromosome numbers of the F2 and backcross plants that the successful F1 gametes possess high chromosome numbers. This phenomenon is explained in terms of‘genomic buffering’, i.e. F1, gametes with large numbers of chromosomes are better buffered than those with small numbers of chromosomes to withstand the effects of a mixture of alien chromosome material resulting from meiosis in F1 hybrids between polyploids. The importance of this phenomenon is discussed in relation to the evolution of polyploid species of Papaver in Section Orthorhoeades.

Ancillary

Advertisement