CENTRE ON THE PROBLEMS OF ECOLOGY AND PRODUCTIVITY OF FORESTS
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CENTRE ON THE PROBLEMS OF ECOLOGY AND PRODUCTIVITY OF FORESTS |
RUSSIAN ACADEMY OF SCIENCES |
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M.G. Romanovsky, L.V. Khromova Compatibility of Tissues in Embryogenesis of Pine // Forest Science (Lesovedenie). 2013. No 2. С.53-63. The intraspecies compatibility of cells in different individuals and generations is one of the old-age problems in sexual reproduction. In conifers, we observe an inheritance of ferns that is the compatibility due to the interaction between embryo and female gametophyte. Incompatibility of germs and endosperms causes death of embryos and an appearance of empty seeds. Germ receives only paternal plastids. Before fertilization, maternal plastids of ovum estrange themselves in Hofmeister bodies. Two types of plastids are present in Scotch pine populations. As paternal and maternal plastids do not coincide, a germ is compatible with endosperm. Death of female gametophytes of the second year before fertilization, which leads to the formation of abortive seeds, is not related to the intraspecies compatibility. A half of the gametes in half-sterile-coned pine trees do not synthesize copies of DNA molecules in the amount sufficient to accomplish the "distributional" cenocyte stage of the macrogametophyte development. Because of the insufficient polyteny level in one of the chromosomes in the haplotype of a functional macrospore, macrogametophyte dies, its development being incomplete. Polyteny is preserved in proembryo cells of conifers. In tissue culture, somatic embryogenesis begins with the formation of large, probably, polytene cell-tubes. Scotch pine, cross compatibility, empty seeds, abortive seeds.. |
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