Structure and function of the hypertrophic synergid in some species of genus Allium L.

1182 8 4851 2 13519 document 4851 256296841_Structure_and_function_of_the_hypertrophic_synergid_in_some_species_of_genus_Allium_L_ev=prf_pub text/html 94700fc26059461e05e5da698d62dee8 MD5 187859 2014-02-21 16:13:28 http://eprints.iliauni.edu.ge/1182/1/256296841_Structure_and_function_of_the_hypertrophic_synergid_in_some_species_of_genus_Allium_L_ev%3Dprf_pub 1182 1 1 text/html text en public

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7802 2 21140 document 7802 lightbox.jpg image/png 61f3390f7961e6e382d93b73aa68cfeb MD5 48713 2015-03-24 11:37:48 http://eprints.iliauni.edu.ge/1182/3/lightbox.jpg 1182 3 3 image/png other Thumbnails conversion from text to thumbnail_lightbox ge public

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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/7795 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/7795 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/7795 archive 65 disk0/00/00/11/82 2014-02-24 07:50:38 2015-03-24 11:27:26 2014-02-24 07:50:38 article show maia_akhalkatsi@iliauni.edu.ge Nadirashvili Nino Gvaladze Guranda Akhalkatsi Maia maia_akhalkatsi@iliauni.edu.ge Structure and function of the hypertrophic synergid in some species of genus Allium L. pub QK public The egg cell in the embryo sac of flowering plants is generally accompanied by two symmetrical cells, called synergid cells, which usually contains haploid nucleus. However, in some species of genus Allium L. mainly one and sometimes both of the synergid cells enlarge in size, undergo endopolyploidization and become hypertrophic. We have studied structure of the synergid cells of Allium atroviolaceum Boiss., A. rotundum L., A. fistulosum L. and A. cepa L. and determined DNA amount (C value) in the synergid cells of A. atroviolaceum. Cytophotometric study of various Feulgen-stained synergid and integument nuclei revealed clear difference in DNA content both in different types of the cells and in different stages of synergid development. The amount of DNA measured in newly formed synergid was already equal to 2C value found in the integument cell nucleus. At the time of fertilization the DNA amount in synergid is 4C. At the stage of proembryo it is already 6C and before degeneration at the late globular stage of embryo development 8C. No sign of mitotic cell division or formation of metaphase plate have been observed in any of investigated materials. It is assumed that endopolyploidization might determine longer persistent of intact synergid and increase of its trophic function. 2006-01-01 published Proceedings of the Georgian Academy of Sciences Biological series B 4 2 Department of Biological Sciences of the Georgian National Academy of Sciences 53-60 http://www.science.org.ge/english.html TRUE 1512 - 2123 http://www.science.org.ge/english.html https://www.researchgate.net/publication/256296841_Structure_and_function_of_the_hypertrophic_synergid_in_some_species_of_genus_Allium_L?ev=prf_pub