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Browsing by Author "Agar, G"

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    Article
    Changes in Phytohormone Contents in Chickpea Seeds Germinating Under Lead or Zinc Stress
    (Acad Sciences Czech Republic, inst Experimental Botany, 2005) Atici, Ö; Agar, G; Battal, P
    The present work describes the changes that take place in phytohormone contents in germinating chickpea (Cicer arietinum cv. Aziziye-94) seeds in response to heavy metal stress. For this aim, endogenous abscisic acid (ABA), gibberellic acid (GA(3)), zeatin (Z) and zeatin riboside (ZR) contents were followed for 24, 48 and 72 h in chickpea seeds germinating at the concentrations of 0.1, 1.0 and 5.0 mM Pb or 0.1, 1.0 and 10 mM Zn. The results showed that Pb and Zn significantly delayed and impeded the germination of chickpea seeds. The negative effect of Pb on germination was higher than that of Zn. Further, Pb increased ABA and Z contents while decreased GA(3) content in the germinating seeds. The high concentrations of Zn (1.0 and 10 mM) decreased contents of Z, ZR and GA(3) while 0.1 mM Zn increased the content of the same hormones. The ABA content was enhanced by Zn in all concentrations used.
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    Interaction Between Endogenous Plant Hormones and Α-Amylase in Germinating Chickpea Seeds Under Cadmium Exposure
    (Parlar Scientific Publications (p S P), 2003) Atici, Ö; Agar, G; Battal, P
    This study was carried out to establish the interaction between endogenous plant hormones (gibberellic acid, zeatin and zeatin riboside-type cytokinins) and alpha-amylase (EC 3.2.1.1) activity in germinating chickpea (Cicer arietinum L. cv. Aziziye-94) in the presence of cadmium (Cd). Plant hormones were quantitatively determined using HPLC analysis. The influence. of 3 different levels (0.1, 1.0 and 5 mM) of Cd on endogenous gibberellic acid (GA), zeatin (Z), zeatin riboside (ZR) levels and (alpha-amylase activity was determined in germinating chickpea seeds for 24, 48 and 72 h. Gibberellic acid levels and alpha-amylase activities were diminished at all Cd concentrations studied. Low Cd concentrations (0.1 and 1.0 mM) increased cytokinin (CK) levels, while the highest concentration (5 mM) decreased them depending on the increase of germination time. There was a negative correlation between GA and CK levels in germinating chickpea seeds exposed to low Cd concentrations.