Volume 48 Number 1 Article 4 Pages: 20-26
Year 1994 Month 1
Title: Effect of Cultivar on Endogenous Ethylene Evolution and Its Relationship to Increases of Soluble Protein in Peach Mesocarp Tissue
Authors: K.A. Klozenbucher, S.A. Altman, M.S. McIntosh and C.S. Walsh
Citation
Abstract:
Differences in ethylene evolution rate among
'Biscoe,' 'Belle of Georgia,' 'Loring,' and 'Redskin
peach (Prunus persica L.) and 'Fantasia' nec
tarine (Prunus persica L., v nuciperscia) fruits
were investigated.
The effect of cultiyar on
ethylene evolution rate was highly significant.
The mean ethylene evolution rate in 'Belle of
Georgia' peacn fruits was higher than in any
other cultivar.
The lowest mean ethylene evolu
tion rate was observed in 'Loring' peach fruits.
Ethylene evolution rates were compared with
ripening associated changes in accumulation of
soluble mesocarp proteins.
The soluble protein
fraction extracted from fruits at three time
points during ripening were resolved by de
naturing polyacrylamide gel electrophoresis.
Protein oand density was determined Tby scan
ning laser microdensitometry.
Cultivar and
ethylene evolution rate were related to protein
density and significant gel protein band by
cultivar interactions were observed.
Analysis of
band variance tested the effect of cultiyar on
protein accumulation during maturation.
Sixteen
bands showed significant differences and five
bands showed no significant differences among
cultivars.
For 'Belle of Georgia* fruits, the
ethylene evolution rate was related to increased
accumulation of two proteins with estimated
molecular masses of 39.0 and 56.5 kDa.
No
increased accumulation of 39.0 or 56.5 kDa
protein was observed in the three remaining
rrunus cultivars with suppressed ethylene evolu
tion rates, or in ripening 'Loring' fruits treated
with (2-chloroethyl)phosphonic acid (ethephon).
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