caa a22 4500 47581780X CHVBK 20180406123813.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/s004970000041 doi (NATIONALLICENCE)springer-10.1007/s004970000041 Western white pine ( Pinus monticola Dougl.) reproduction: II. Fertilisation and cytoplasmic inheritance [Elektronische Daten] [Darla Bruns, J. N. Owens] Abstract : Fertilisation and proembryo development are described from transmission electron micrographs emphasising the origin and fate of the maternal and paternal mitochondria and plastids. During central cell and egg development mitochondria migrate toward the nuclei, forming a perinuclear zone consisting predominantly of maternal mitochondria and polysomes. At the same time, maternal plastids transformed and at fertilisation are excluded from the neocytoplasm. The pollen tube releases two sperm nuclei into the egg with cytoplasm from the generative cell and the tube cell. The leading sperm nucleus fuses with the egg nucleus and a small number of paternal mitochondria and plastids are taken into the perinuclear zone. The second sperm nucleus degenerates. As the zygote nucleus undergoes mitosis followed by free nuclear division and nuclear migration to the chalazal end of the archegonium, maternal and paternal organelles intermingle within the neocytoplasm. The result is paternal inheritance of plastids and biparental, but predominantly maternal, inheritance of mitochondria. This pattern is consistent within the Pinaceae but differs from some other conifer families. Springer-Verlag Berlin Heidelberg, 2000 Key words White pine nationallicence Egg nationallicence Sperm nationallicence Fertilisation nationallicence Cytoplasmic inheritance nationallicence Proembryo nationallicence Bruns Darla Centre for Forest Biology, University of Victoria, P.O. Box 3020 STN CSC, Victoria, British Columbia V8W 3N5, Canada e-mail: jowens@uvic.ca Fax: +1-250-721-6611, CA aut Owens J. N. Centre for Forest Biology, University of Victoria, P.O. Box 3020 STN CSC, Victoria, British Columbia V8W 3N5, Canada e-mail: jowens@uvic.ca Fax: +1-250-721-6611, CA aut https://doi.org/10.1007/s004970000041 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004970000041 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bruns Darla Centre for Forest Biology, University of Victoria, P.O. Box 3020 STN CSC, Victoria, British Columbia V8W 3N5, Canada e-mail: jowens@uvic.ca Fax: +1-250-721-6611, CA aut NATIONALLICENCE 700 1- Owens J. N. Centre for Forest Biology, University of Victoria, P.O. Box 3020 STN CSC, Victoria, British Columbia V8W 3N5, Canada e-mail: jowens@uvic.ca Fax: +1-250-721-6611, CA aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer