Ethylene release from green spruce needles involves a combination of ACC-dependent and independent pathways
1991
Chen, Y.M. | Wellburn, A.R.
Aminoethoxyvinylglycine (AVG) and cobalt ions strongly inhibit the conversion of added methionine or aminocyclopropane-l-carboxylic acid (ACC) into ethylene by green-coloured, non-stressed Norway spruce (Picea abies L.) needles but only 30%-40% of basal ethylene formation is affected by such inhibitors. In addition, free radical-mediated ACC-independent ethylene formation (AIEF) of the type released by brown-coloured spruce needles also occurs in extracts from healthy green-coloured needles. Treatment with CdCl2 (10 mM), Na2S2O2 (5 mM) or FeSO4 (10 mM) induces 3-7 fold increases in the rates of ethylene evolution from green-coloured needles. However, only Cd2+-induced ethylene formation is inhibited by AVG while ethylene induced by S2O5(-2) or Fe2+ is insensitive to added AVG although increased levels of ACC have also been detected in these treatments. Nevertheless, ethylene-forming decomposition of the precursors of AIEF is accelerated by S2O5(-2) or Fe2+ which indicates that the ethylene released from green-coloured spruce needles is formed by a combination of both the ACC-dependent and AIEF pathways.
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