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-3 Maheshwari, P. (1963): Recent advances in the embryology of Angiosperms . - Int. Soc. Pl. Morph., Univ. Delhi. Recent advances in the embryology of Angiosperms

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Cytological and embryological studies on apomictic species Bothriochloa ischaemum L. were carried out. Our studies revealed that the chromosome number of its root apical cells was 40, indicating that it was a tetraploid cytotype. During the stage of microsporogenesis, meiosis seemed irregular, as the pairing chromosome number of microspore mother cell was more than 20. It was often found that some chromosomes did not assemble in the equatorial plane or moved to the two poles of the cell, a few laggards were seen. Multiporate pollens (22.3%) were often observed. The studies showed that a high frequency (87.8%) of 1–3 or more aposporous embryo sacs developed in one ovule of the species. The mature aposporous sac was usually characterized by an egg cell and one polar nucleus. The egg cell could develop spontaneously into a large proembryo (100–200 μm) mass prior to anthesis. When several aposporous sacs occurred in the same ovule, usually 2 aposporous sacs were involved in pseudogamy and developed into separate endosperm masses in the same ovary. In the low frequency of mature seed, 13.5% twinembryo seedlings could be obtained after mature seeds germinated.

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) ’shocking’ developments in chick embryology: electroporation and in ovo gene expression. Nat. Cell Biol. 1 , E203–207. Krumlauf R. ’shocking’ developments in chick embryology

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Society of Human Genetics and European Society of Human Reproduction and Embryology. Eur. J. Hum. Genet., 2013, 21 (Suppl. 2), S1–S21. Hens, K., Dondorp, W., Handyside, A. H., et al.: Dynamics and ethics of

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120 Bouman, F. (1984) The ovule. In: Johri, B. M. (ed.) Embryology of Angiosperms . Berlin, Springer-Verlag, pp. 123–157. Bouman F

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Orvosi Hetilap
Authors: Zoltán Langmár and Péter Sziller

Van Dijk, L. J., Nelen, W. L., D’Hooghe, T. M. és mtsai: The European Society of Human Reproduction and Embryology guideline for the diagnosis and treatment of endometriosis: an electronic guideline implementability appraisal. Implement. Sci., 2011

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-egészségtan (Diseases of Rabbits). Mezogazdasági Kiadó, Budapest. Sadler, T. W. 1999: Medical Embryology. Medicina Könyvkiadó Rt., Budapest. Medical Embryology

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excentricus. Science 1984 225 442 443 Ivanova-Kazas, O. M. (1995) Evolutionary Embryology of

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. France 20 Tiagiw, B. and Taimni, S. (1963): Floral morphology and embryology of Vernonia cinerescens Schult. and V. cinerea Less. 12

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K.H. Mann , Leeches (Hirudinea) Their Structure, Physiology, Ecology and Embryology, Pergamon Press, 1962, p. 146. I.S. Whitaker, J. Rao, D. Izadi , and P

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