%0 Journal Article
%T Germination, ¦Á-, ¦Â-Amylase and Total Dehydrogenase Activities of Amaranthus Caudatus Seeds Under Water Stress in the Presence of Ethephon or Gibberellin A3
%A Bo ena Bia ecka
%A Jan K pczy¨½ski
%J Acta Biologica Cracoviensia Series Botanica
%@ 1898-0295
%D 2010
%I 
%R 10.2478/v10182-010-0001-0
%X Amaranthus caudatus L. 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¡ãC in darkness delayed germination and reduced final germination percentage. PEG solutions at osmotic potential lower than -0.3 MPa almost totally blocked seed germination. Ethephon was much more effective than GA3 in reversing PEG-caused inhibition of A. caudatus seed germination. PEG decreased ¦Á-amylase activity after 14 h incubation. It decreased ¦Â-amylase activity after 14 and 20 h, and caused an increase in total dehydrogenase activity only after 20 h of incubation. Unlike GA3, ethephon increased ¦Á-amylase activity in seeds after 12 and 14 h of incubation under water deficit. After 20 h of incubation there was no difference in ¦Á-amylase activity in any of the treatments. Neither ethephon nor GA3 affected the activity of ¦Â-amylase and dehydrogenase.
%K Amaranthus caudatus seeds
%K ¦Á-
%K ¦Â-amylase
%K dehydrogenase
%K ethylene
%K gibberellin A 3
%K polyethylene glycol
%U http://versita.metapress.com/content/b519267tq2j07496/?p=bc2e3071f7b149109e3fcc5a0e3a6e48&pi=0