Cytological mechanisms of unreduced pollen formation in Solanum tuberosum L. cv. Morfana
Bu çalışmada Solanum tuberosum L. cv. Morfana çeşidinin polen ana hücrelerinde mayoz bölünme incelendi ve şu bozukluklar görüldü: univalent ve multivalentlerin oluşumu, kromozom köprüleri, fragmentler, gecikmiş kromozomlar, yoğunlaşmış kromozomlar, tripolar dağılım. Polen ana hücrelerinin çoğunda telofaz I i sitokinez izler ve diatlar oluşur. Diat hücreleri mayoz II yi geçirmezler ve indirgenmemiş kromozomlu mikrosporları oluştururlar. Erken sitokinez ve diat oluşum yüzdeleri arasında paralellik vardır. İndirgenmemiş polen oluşumunun temel sitolojik mekanizmasının erken sitokinez olduğu sonucuna varılmıştır.
Solanum tuberosum L. cv. Morfana' da indirgenmemiş polen oluşumun sitolojik mekanizmaları
In this study, the meiotic division in pollen mother cells (PMCs) of Solarium tuberosum L. cv. Morfana was investigated and the following irregularities were observed: univalent and multivalent formation, chromosome bridges, fragments, lagging chromosomes, condensed chromosomes, tripolar separation. In majority of pollen mother cells the first telophase was followed by cytokinesis and dyads are formed. These cells do not undergo second meiotic division. As a result, unreduced microspores are produced. The frequency of premature cytokinesis corresponded well with the frequency of dyads leading to unreduced pollen formation. It was concluded that the major cytological mechanism of unreduced pollen formation is premature cytokinesis in this cultivar of potato.
___
- Camadro EL and Peloquin SJ. The occurrence and frequency of 2n pollen in three diploid Solanum from northwestern Argentina. Theor Appl Genet. 56: 11- 15,1980.
- Choudhuri HC. Cytological studies in the genus Solanum I. Wild and native cultivated diploid potatoes. Trans Roy Soc Edin. 61:113-135, 1943.
- Choudhuri HC. Spontaneous chromosome aberrations in diploid Solanum. Amer Pot J. 48: 187-194, 1971.
- Choudhuri HC. Genetical studies in some West African Solanum melongena L. Canad J Genet Cytol. 14: 446- 449, 1972.
- Choudhuri HC. Genetical studies in some West African Solanum melongena L. var. Bassawa. Cytologia. 40: 389-400, 1975.
- den Nijs TPM and Peloquin SJ. 2n gametes in potato species and their function in sexual polyploidization. Euphytica. 26: 585-600, 1977.
- Matsubayashi M. Cytological mechanism for the formation of 2n pollen grains in tuberous Solanums. Potato Sci. 1: 29-34, 1981.
- Ramanna MS. The origin of unreduced microspores due to aberrant cytokinesis in the meiocytes of potato and its genetic significance. Euphytica. 23: 20-26, 1974.
- Sangowawa BG. Chromosome studies in a diploid potato (Solanum mochience Ochoa). Cytologia. 52: 335-342. 1987.
- Watanabe K and Peloquin SJ. Occurrence and frequency of 2n pollen in 2x, 4x and 6x wild tuber-bearing Solanum species from Mexico and Central and South Americas. Theor Appl Genet. 82: 621-626, 1991.
- Watanabe K and Peloquin SJ. Cytological basis 2n pollen formation in a wide range of 2x, 4x and 6x taxa from tuber-bearing Solanum species. Genome. 36: 8-13, 1993.
- ISSN: 1303-3646
- Yayın Aralığı: Yılda 2 Sayı
- Yayıncı: Haliç Üniv. Fen Edebiyat Fak.
Sayıdaki Diğer Makaleler
The role of opsonin in phagocytosis by coelomocytes of the earthworm Dendrobaena veneta
Ayten KİMİRAN, Ayşın ÇOTUK, Yeşim KALAÇ, Gülruh ULAKOĞLU
Inhibitory effect of hepatectomized (35%) mice serum upon the growth of L-cells
Mehmet TOPÇUL, Gül ÖZCAN, Seyhan ALTUN
Efficiency of the gamma irradiation in the induction of in vitro somatic mutations
Phytoalexins: Defence or just a response to stress?
Bahar TAŞDELEN, A. Hadi ÇAKIR, Fazilet ŞİMŞEK, Ayşen ÇELEBİOĞLU
Cytological mechanisms of unreduced pollen formation in Solanum tuberosum L. cv. Morfana