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    Removal of cadmium by Myriophyllum heterophyllum Michx. and Potamogeton crispus L. and its effect on pigments and total phenolic compounds
    (Springer, 2008) Sivaci, Aysel; Elmas, Emire; Guemues, Fatih; Sivaci, E. Ridvan
    In this study, cadmium biosorption by Myriophyllum heterophyllum Michx. and Potamogeton crispus L. was investigated. Although both species were found to be capable of removing cadmium from water, the performance of P. crispus was the most significant. These species were treated with 0, 4, 8, 16, 32, and 64 mg L-1 cadmium solutions for 24, 48, 72, and 96 h, respectively. Cadmium uptake of both species was lowest at 4 mg L-1 and highest at 64 mg L-1. Photosynthetic pigments and total phenolic compounds in both species were determined after exposure to various concentrations of cadmium for various times. Depending on the cadmium accumulation in both species, it was shown to decrease the level of chlorophyll a, chlorophyll b, and carotenoids (24 and 96 h). The anthocyanin concentration in P. crispus increased at all cadmium concentrations studied (0, 4, 8, 16, 32, and 64 mg L-1), whereas in Myriophyllum heterophyllum it increased at the lower cadmium concentrations (0, 4, and 8 mg L-1) but decreased at higher cadmium concentrations (16, 32, and 64 mg L-1), for all exposure periods. The total phenolic compound level in both species increased with cadmium concentration during the 24 and 96 h exposure periods.
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    The seasonal changes in endogenous levels of indole-3-acetic acid, gibberellic acid, zeatin and abscisic acid in stems of some apple varieties (Malus sylvestris Miller)
    (Asian Network for Scientific Information, 2008) Sivaci, Aysel; Yalcin, Ibrahim
    Seasonal changes of total indole-3-acetic acid (IAA), gibberellic acid (GA3), zeatin and abscisic acid (ABA) levels were investigated in stem cuttings of apple (Malus sylvestris Miller) varieties, Golden delicious, Starkrimson delicious and Misket delicious' at different times of the year. All of the apple varieties exhibited seasonal differences in hormone levels. The total IAA, GA3 and zeatin contents of these apple varieties increased to the highest value in May but it was the lowest in February. Whereas ABA levels observed in May were lower in the studied apple varieties, but it was the highest level in February. Except for ABA other hormones, IAA, GA3 and zeatin levels, were the lowest in 'Misket delicious' among the all apple varieties in all sampling periods (August-May). © 2008 Asian Network for Scientific Information.