  The nuclear DNA amount in angiosperms is studied from the eigen-value
equation of the genome evolution operator H. The operator H is introduced by
physical simulation and it is defined as a function of the genome size N and
the derivative with respective to the size. The discontinuity of DNA size
distribution and its synergetic occurrence in related angiosperms species are
successfully deduced from the solution of the equation. The results agree well
with the existing experimental data of Aloe, Clarkia, Nicotiana, Lathyrus,
Allium and other genera. It may indicate that the evolutionary constrains on
angiosperm genome are essentially of quantum origin.
