LI, GUIQIN1* and YINGLIN MU2. 1department of biology engineering, Hebei economic & trading university, wuqi road, shijiazhuang 050061, China; 22435 w polk st. apt1, Chicago, IL 60612, USA. - Microsporogenesis observation and karyotype analysis of some species in genus Juglans L..
The PMC(pollen mother cell) meiosis process and pollen morphology of 4
species were observed and the pollen living activity of 2 species was
measured. It was discovered that the PMC meiosis process of J. regia,
J. mandshurica and J. nigra were basically normal, but that of J.
hopeiensis was very irregular. The karyotypes of 7 species were
analysed. According to the karyotype and pollen characters, 7 species
tested were divided into 3 sections, and they are sect Jglans, sect
Cardiocaryon and sect Rhysocaryon. The evolutionary relationships
among the sections and the species in one section were approached. The
authers pointed out that J. hopeiensis should be regarded as an
independence species and the Juglandaceae was probably derived from two
different plants with x=8 in phylogeny, and supported the view that
China should be one of the original places of J. regia.
Key words: evolution, Juglandaceae, Juglans, karyotype, microsporogenesis, walnut