Ethylene-regulation of fruit softening and cell wall enzymes activities during peach storage
ABSTRACT:
‘Yanhong’ peach fruits were treated with 1 mg/g ethrel and 2
µl/l 1-methylcyclopropene and stored at room temperature for 12 days. Ethylene
production, firmness, and the activities of polygalacturonase,
endo-1,4-β-glucanase, β-galactosidase, α-L-arabinofuranosidase and
endo-β-mannanase in ‘Yanhong’ peach were monitored during storage. Control
fruit displayed a typical climacteric pattern of ethylene production and the
early softening of peach fruits started before the climactic stage. Ethrel
promoted the decrease in firmness and onset of ethylene production. In
contrast, 1-methylcyclopropene treatment delayed the decline in fruit firmness
and onset of ethylene production. The activities of polygalacturonase,
endo-1,4-β-glucanase, β-galactosidase, α-L-arabinofuranosidase and
endo-β-mannanase in both epicarp and mesocarp tissue were enhanced by exogenous
ethrel and inhibited by 1-methylcyclopropene during storage. Additionally, most
activities of β-galactosidase, α-L-arabinofuranosidase and endo-β-mannanase
were associated with the epicarp than that in mesocarp throughout fruits
storage. These results suggest that softening of ‘Yanhong’ peach fruits was
associated with these cell wall enzymes activities which were regulated by
ethylene. Thus, application of 1-methylcyclopropene can extend the postharvest
life of ‘Yanhong’ peach fruits.
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