Changes in phytohormone contents in chickpea seeds germinating under lead or zinc stress
Atici, Oe.(Atatuerk Univ., Erzurum (Turkey). Dept. of Biology)E-mail:[email protected] | Agar, G.(Atatuerk Univ., Erzurum (Turkey). Dept. of Biology) | Battal, P.(Yuezuencue Yil Univ., Van (Turkey). Dept. of Biology)
The present work describes the changes that take place in phytohormone concentrations in germinating chickpea (Cicer arietinum cv. Aziziye-94) seeds in response to heavy metal stress. For this aim, endogenous abscisic acid (ABA), gibberellic acid (GA3), zeatin (Z) and zeatin riboside (ZR) concentrations 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 concentrations but decreased those of GA3 in the germinating seeds. Zn used at 1.0 or 10 mM levels decreased and at 0.1 mM level increased Z, ZR and GA3 concentrations. The ABA concentration was enhanced by all Zn concentrations used.
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