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Articles by Osman BEYAZOGLU
Total Records ( 3 ) for Osman BEYAZOGLU
  Huseyin Inceer , Osman Beyazoglu and H. Aytekin Ergul
  The cytogenetic effects of the wastes of copper mine were investigated using root tip cells of Allium cepa L. The roots were treated with 10, 75 and 100 percent of copper wastes at 36 hour. Copper wastes caused some chromosomal abnormalities in root tip cells. It was found that copper wastes have a marked mitodepressive action on mitosis.
  Sema Hayirlioglu-Ayaz and Osman Beyazoglu
  In this study, the seeds of five Vicia L. (Leguminosae) species were anatomically investigated. The present work deals with the following species: Vicia cracca subsp. cracca L., V. tetraspermae (L.) Schreb., V. hirsuta (L.) S.F. Gray., V. hybrida L. and V. sativa subsp. nigra L. Seed sections (10-15 μm) were obtained and used to establish tissue and cell features. Our data indicate that the seed coat of Vicia species have a rough cuticle surface and a rigid structure. The structure of seed coat shows that there are significant differences among species based on the layers and cell sizes of seed coats.
  Pollen morphology of the 13 taxa of Scorzonera L. (Asteraceae) from Turkey was investigated by using light (LM) and scanning electron microscopy (SEM). As a result of LM and SEM observations, it was found that the pollen types are generally isopolar, radially symmetric, triangular in polar view, and lophate, with lophae ornamentations that are echinate-perforate and an exine thickness ranging from 6.99 to 11.82 μm. The present study found that the lacunae ornamentation of S. laciniata subsp. laciniata and S. tomentosa is perforate-microrugulate, that of S. suberosa and S. cinerea is perforate-microreticulate, that of S. pseudolanata is perforate-psilate, and that of the others is perforate. Prolate-spheroidal pollen shapes were observed in S. insica, and oblate-spheroidal shapes were observed in the rest of the examined taxa, e.g. S. tomentosa, S. pseudolanata, and S. sericea. Spine length ranged between 1.3 and 4.63 μm among the examined taxa. S. tomentosa (4.63 μm) showed the highest value. S. insica (1.3 μm) showed the lowest value. PCA analysis based on the 16 palynological traits showed that polar axis, equatorial diameter, pollen diameter, colpus length, colpus width, and exine and spine length were the most important characters in explaining total variation among the examined taxa. The results also indicated that pollen characters would be useful in separating the examined taxa.
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