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Articles by Serdar MAKBUL
Total Records ( 2 ) for Serdar MAKBUL
  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.
  Serdar MAKBUL , Neslihan SARUHAN GULER , Nuran DURMUS and Seher GUVEN
  Anatomical changes in the root, stem, and leaf of soybean (Glycine max (L.) Merr. cv. Nazl?can) plants under drought stress were studied by light microscope and their significance was evaluated by numerical analysis. Some anatomical features related to parenchymatous cells, diameter of tracheas belonging to the root, stem, and leaf; stomata index; and size and average number of stomata and epidermal cells were found to be important characters varying in soybean plants under stress. These characters were also statistically significant. Leaf water potential Ψleaf), root:shoot ratio, total chlorophyll content, and stomatal conductance were measured. Ψleaf, total chlorophyll content, and stomatal conductance were lower while root:shoot ratio was higher in stressed plants compared to the unstressed ones. It has been concluded that some anatomical and physiological changes occurred in soybean under drought stress.
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