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Amaranthus caudautus seed germination was studied under different levels of water deficit induced by PEG 6000 in laboratory conditions PEG at osmotic potentials -0 2 to -0 3 MPa at 24 degrees C in darkness delayed germination and reduced Inial germination percentage PEG solutions at osmotic potential lower than -0 3 MPa almost totally blocked seed germination Ethephon was much more effective than GA(3) in reversing PEG-caused inhibition of A caudatus seed germination. PEG decreased alpha-amylase activity after 14 h incubation It decreased beta-amylase activity after 14 and 20 h, and caused an increase in total dehydrogenase activity only after 20 H of incubation Unlike GA(3), ethephon increased alpha-amylase activity in seeds after 12 and 14 h of incubation under water deficit. Alter 20 h of incubation there was no difference in alpha-amylase activity in any of the treatments Neither ethephon nor GA affected the activity of beta-amylase and dehydrogenase

acta biologica cracoviensia. series botanica

Germination, α-, β-Amylase and Total Dehydrogenase Activities of Amaranthus Caudatus Seeds Under Water Stress in the Presence of Ethephon or Gibberellin A3