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Peach (Prunus persica) fruit ripening: aminoethoxyvinylglycine (AVG) and exogenous polyamines affect ethylene emission and flesh firmness.
AV and exogenous polyamines both reduced the free-to-conjugate ratio of endogenous polyamines, and transiently altered SAMDC activity, and the possible use of these compounds to control fruit ripening is discussed also in the light of their rejuvenating effect on peach fruits. Expand
Characterization of monocot and dicot plant S-adenosyl-l-methionine decarboxylase gene families including identification in the mRNA of a highly conserved pair of upstream overlapping open reading
Analysis of rice, maize and Arabidopsis cDNA species revealed that the monocot enzyme possesses an extended C-terminus relative to dicot and human enzymes, and it was discovered that all expressed plant AdoMetDC mRNA 5' leader sequences contain a highly conserved pair of overlapping upstream open reading frames (uORFs) that overlap by one base. Expand
Methyl jasmonate upregulates biosynthetic gene expression, oxidation and conjugation of polyamines, and inhibits shoot formation in tobacco thin layers.
Northern analyses revealed MJ-induced, generally dose-dependent, increases in the mRNA levels of all three enzymes, and the upregulation of polyamine metabolism is discussed in relation to the morphogenic behaviour of MJ-treated explants. Expand
Pre-harvest polyamine and aminoethoxyvinylglycine (AVG) applications modulate fruit ripening in Stark Red Gold nectarines (Prunus persica L. Batsch)
Putrescine (5, 10 and 20 mM), spermidine (0.5, 1 and 2 mM) and aminoethoxyvinylglycine (AVG; 0.32, 0.64 and 1.28 mM) were applied to peach trees (Prunus persica L. Batsch cv Stark Red Gold) underExpand
Polyamine metabolism is upregulated in response to tobacco mosaic virus in hypersensitive, but not in susceptible, tobacco.
After TMV inoculation, NN, unlike nn, tobacco plants upgrade polyamine synthesis and oxidation; this leads to changes in cellular components which might induce programmed cell death. Expand
Methylglyoxal(bis-guanylhydrazone) inhibition of organogenesis is not due to S-adenosylmethionine decarboxylase inhibition/polyamine depletion in tobacco thin layers
It is suggested that MGBG, in fact, does not behave as a SAMDC inhibitor in shoot-forming tobacco thin layers and that its negative effect on organised growth is not due to SAMDC inhibition/polyamine depletion. Expand
Polyamines and flowering: Spermidine biosynthesis in the different whorls of developing flowers of Nicotiana tabacum L
Abstract The regulation of S‐adenosylmethionine decarboxylase (SAMDC; EC, a key enzyme of polyamine biosynthesis, was analysed at the level of transcript accumulation, enzyme activity, andExpand
Polyamine conjugate levels and ethylene biosynthesis: inverse relationship with vegetative bud formation in tobacco thin layers
A putative link is established between MGBG-enhanced ethylene synthesis, increased conjugate titres and inhibition of meristemoid formation in vegetative bud-forming tobacco. Expand
Secondary metabolism in root and callus cultures of Hyoscyamus muticus L.: the relationship between morphological organisation and response to methyl jasmonate
In root cultures, free Put and N-methylputrescine (mPut) increased upon treatment with MJ, whereas in callus cultures mPut levels were not affected, and different capacity for tropane alkaloid production in the two culture systems was discussed. Expand
Polyamine translocation following photoperiodic flowering induction in soybean
It is suggested that under flowering inductive conditions, PAs play a different role according to the stage of the flowering process, and their translocation from the leaves to the axillary and apical buds might be related to the fact that they were part of the complex mechanism of the floral signal. Expand