Exogenous Polyamines and Gibberellic Acid Effects on Peach (Prunus persica L.) Storability Improvement

Abstract

Peaches (Prunus persica L., cv. Babygold 6) harvested at the stage of commercial ripening were pressureinfiltrated with putrescine (1 mM) or GA 3 (100 mg L -1 ) and then stored at 2 °C for 14 d. Both treatments increased fruit firmness, putrescine-treated peaches being significantly firmer than control ones. Treatments were also effective in reducing the susceptibility of the fruit to be damaged by mechanically compression with lower volume and surface of the damage zone. Ethylene emission and the respiration rate were reduced in treated fruits, which reflects a delay of the ripening process. The effects of the mechanical stress could be related to increased spermidine levels, rather than ethylene emission and respiration rate during storage.

Molecular cloning and characterization of a ripening-induced polygalacturonase related to papaya fruit softening

“…A methyl jasmonate responsiveness cis-element was very similar to that from barley, but no evidence of methyl jasmonate effect on papaya pulp softening was observed by Gonzá lez-Aguilar et al [26], though the treatment reduced chilling injury. In the case of putative GA 3 and salicylic acid responsiveness cis-elements, those could be negative effectors of cpPG expression, since GA 3 and salicylic acid treatments of peaches, papayas and bananas [27,28,29] impaired pulp softening. The motives similar to tobacco and Brassica oleracea defense and heat stress-responsiveness elements would also be involved in the induction of cpPG.…”

Effects of pre-harvest gibberellic acid spraying on gene transcript accumulation during peach fruit development

“…Gibberellic acid (GA 3 ) has been shown to delay maturation of peach (Amarante et al 2005;Ju et al 1999;Martínez-Romero et al 2000) and other fruit (Ben-Arie et al 1996;Ferri et al 2004;Zilkah et al 1997) and in some cases, has also been associated with the prevention of chilling injuries (Amarante et al 2005;Lurie and Crisosto 2005;Pegoraro et al 2010b). The mechanism of GA 3 action seems to vary according with the species involved.…”

Effects of exogenous polyamine and ultrasound treatment to improve peach storability

“…Peaches were treated with 32 kHz ultrasound at powers of 60 W L -1 for 10 min in 4 L distilled water. Based on a previous study (Martínez-Romero et al, 2000), 1 mM Put was chosen as the optimal concentration for our experiment.…”