Chromosome doubling of female gamete in white poplars were studied in Populns tomentosa × P. balleana, P. alla × P. glandulosa and P. alba × P. tomentosa, based on megasporogenesis and megagametogenesis of cytogenetics.Now the research has made progress.
(1) The meiosis stages of megaspore could be discriminated timely through observing the meiosis of microspore under the same environmental conditions, according to the association of female and male buds during development. Results indicated : The...