Viburnum tinus L.’ nin Üreme Organlarının Gelişimsel Özellikleri

Abstract

Adoxaceae familyasına ait olan Viburnum tinus eczacılık ve peyzaj mimarisinde sıklıkla kullanılan bir bitkidir. Korimbus tip çiçek durumunda bulunan beyaz ve hoş kokulu çiçekler hermafrodittir. Çiçek tomurcuklarında gelişim apikal meristemin küçük bir çıkıntı olarak farklılaşması ile başlar. İlerleyen evrelerde apikal tepe genişleyip düzleşerek floral meristeme dönüşür. Floral meristem hücreleri büyük hacimli ve bol sitoplazmalıdır. Gelişimin ilerlemesi ile beraber floral meristemden ilk önce beş adet stamen taslağı, ardından 3 adet karpel taslağı farklılaşır. Anterler tetrasporangiyattır. Anter çeperi epidermis, fibroz kalınlaşma gösteren endotesyum, kısa ömürlü ara tabaka ve plazmodyal tapetumdan oluşur. Tapetum hücreleri genç polen evresinde körelir. Polen taneleri stomiumların açılması ile doğaya salınır. Karpel taslakları yukarı doğru uzayıp, birleşerek ovaryumun üzerinde stilusu oluşturur. Her ovaryum lokusunda bir tohum taslağı farklılaşır. Ancak tohum taslaklarından sadece bir tanesi olgun embriyo kesesine dönüşür. Tohum taslakları tek integümentli ve tenuinusellat tiptedir. Stilus nakil doku içerir. Stigma üç loblu ve ıslak tiptedir. Stilusun nakil dokusu ve stigma papilleri tozlaşmadan sonra körelmeye başlar.

Keywords

• çiçek ontogenisi,eşeyli üreme,gelişim biyolojisi,üreme biyolojisi,Viburnum tinus

Developmental Features of Reproductive Organs in Viburnum tinus L.

Abstract

Viburnum tinus, which belongs to Adoxaceae family, is a plant that commonly used in pharmacy and landscape architecture. Flowers located in corymb-type of the inflorescence are white, fragrant, hermaphrodite. The development of the flower buds begins with the differentiation of the apical meristem as a small bulge. Afterwards, the apical apex is expanded, flattened and transforms into a floral meristem. Floral meristem cells have large volume and abundant cytoplasm. Concomitant with the development, firstly five stamen primordia and then three carpel primordia differentiate from the floral meristem. Anthers are tetrasporangiate. Anther wall is formed by epidermis, endothecium with fibrous thickening, ephemeral middle layer and, plasmodial tapetum. Tapetal cells degenerate at the young pollen stage. Pollen grains are discharged by the opening of stomium. Carpel primordial cells lengthen upwards, merge and form a style above the ovary. An ovule differentiates into each ovarian loculi. But the development continues only in one them and transforms into the mature embryo sac. Ovules are unitegmic and tenuinucellate. The style has a transmitting channel. Stigma is three-lobed and wet typed. The transmitting tissue and stigmatic papillae start to degenerate after pollination.

Keywords

• developmental biology,flower ontogeny,reproductive biology,sexual reproduction,Viburnum tinus

References

1. Backlund A., Bittrich V., 2016. Adoxaceae. In Flowering Plants. Eudicots (pp. 19-29). Springer, Cham.
2. Benko-Iseppon A.M., Morawetz, W., 2000. Viburnales: Cytological Features and a New Circumscription. Taxon 5-16.
3. Bernier G., Havelange A., Houssa C., Petitjean A., Lejeune P., 1993. Physiological Signals That İnduce Flowering. Plant Cell 5:1147-1155.
4. Çetinbaş A., Ünal M., 2012. Comparative Ontogeny of Hermaphrodite and Pistillate Florets in Helianthus annuus L. (Asteraceae). Notulae Scientia Biologicae 4(2):30-40.
5. Çetinbaş-Genç A., Ünal M., 2017. Flower Ontogeny and Reproductive Biology of Salvia viridis L. Pakistan Journal of Botany 49: 891-896.
6. Darras A.I., Akoumianaki-Ioannidou A., Pompodakis N.E., 2010. Evaluation and Improvement of Post-Harvest Performance of Cut Viburnum tinus Inflorescence. Scientia horticulturae 124(3):376-380.
7. Donoghue M.J., Bell Charles D., Winkworth Richard C., 2003. The Evolution of Reproductive Characters in Dipsacales. International Journal of Plant Sciences 164(5): 453–464.
8. Feder N., O’Brien T.P., 1968. Plant Microtechnique: Some Principles and New Methods. Amerikan Journal of Botany 55(1): 123-142.

9. Fisher D.B., Jensen W.A., Ashton M.E., 1968. Histochemical Studies of Pollen: Storage Pockets in the Endoplasmic Reticulum. Histochemie 13: 169-182.
10. Gasser S., Beers K., 1993. Pistil Development. Plant Cell 5:1231-1239.
11. Ghimire B., Suh G.U., Lee C.H., Heo K., Jeong M.J., 2018. Embryological Studies on Abelia tyaihyoni Nakai (Caprifoliaceae). Flora 242:79-88.
12. Heslop-Harrison Y., 1977. The Pollen Stigma İnteraction: Pollen Tube Penetration in Crocus. Annals of Botany 41:913–922.
13. Irene S., Salvatore P., Adela O., 2010. Programmed-cell-death Hallmarks in Incompatible Pollen and Papillar Stigma Cells of Olea europaea L. Under Free Pollination. Plant Cell Reports 29(6):561-572.
14. Jin B., Li N., Jia N., Zhou W., Wang L., Xiang Q., 2007. Observations on the Anatomy of Reproductive Organs and the Pollinators of Viburnum macrocephalum f . keteleeri (Caprifoliaceae). Acta Phytotaxonomica Sinica 45:753–768.
15. Jin B., Wang L., Wang J., Teng N.J., He X.D., Mu X.J., Wang Y.L., 2010. The Structure and Roles of Sterile Flowers in Viburnum macrocephalum f. keteleeri (Adoxaceae). Plant Biology 12: 853–862.
16. Kinney M.S., Columbus J.T., Friar, E.A., 2008. Unisexual Flower, Spikelet, and Inflorescence Development in Monoecious/Dioecious Bouteloua dimorpha (Poaceae, Chloridoideae). American Journal of Botany 95(2): 123-132.
17. Konarska A., 2017. Comparative Micromorphology and Anatomy of Flowers and Floral Secretory Structures in Two Viburnum Species. Protoplasma 254(1): 523-537.
18. Roels P., Smets E., 1994. A Comparative Floral Ontogenetical Study Between Adoxa moschatellina and Sambucus ebulus. Belgian Journal of Botany 127: 157-170.
19. Sandoval-Oliveros R., Guevara-Olvera L., Beltrán J.P., Gómez-Mena C., Acosta-García G., 2017. Developmental Landmarks During Floral Ontogeny of jalapeño chili pepper (Capsicum annuum L.) and the Effect of Gibberellin on Ovary Growth. Plant reproduction, 30(3): 119-129.
20. Schweizer D., 1976. Reverse Fluorescent Chromosome Banding with Chromomycin and DAPI. Chromosoma 58: 307-324.
21. Teeri T.H., Uimari A., Kotilainen M., Laitinen R., Help H., Elomaa P., Albert V.A., 2006. Reproductive Meristem Fates in Gerbera. Journal of Experimental Botany 57:3445-3455.
22. Vardar F., Ünal M., 2012. Ultrastructural Aspects and Programmed Cell Death in the Tapetal Cells of Lathyrus undulatus Boiss. Acta Biologica Hungarica 63(1):52-66.
23. Wilkinson A.M., 1948. Floral Anatomy and Morphology of Some Species of the Tribe Lonicereae of the Caprifoliaceae. American Journal of Botany 35: 261–271.