ISSN:
1573-5087
Keywords:
Picea abies L
;
conifers
;
ACC
;
ACC-independent
;
free radicals
;
methionine
;
peroxides
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Aminoethoxyvinylglycine (AVG) and cobalt ions strongly inhibit the conversion of added methionine or aminocyclopropane-1-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), Na2S2O5 (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 - 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00024961
