Jasmonates (JAs), which derive from α -linolenic acid through allene oxide synthase (AOS), are signal molecules which elicit stress responses through JA-induced proteins (JIPs). They are also involved in growth processes such as cell division, tuber formation and fruit development. JAs induce various biological responses mostly correlated with defense responses; however, their reciprocal relationships with ethylene are not well established. In apple and cherries endogenous JAs peak during the early phase of fruit growth; but only in apple they rise again at climacteric. A JA derivative, methyl jasmonate (MJ), stimulates ethylene production in pre-climacteric apples but inhibits it in climacteric ones. However, MJ-induced apple degreening is partly independent of ethylene. A better established relation is be that between JAs and PAs. PAs are ubiquitous growth regulators involved in fruit set and development; when applied to developing fruit they inhibit ethylene production and delay ripening in peach and other climacteric fruit. To better understand the relationships JA-ethylene in a climacteric fruit, in the present study, MJ and its synthetic analogous propyl jasmonate (PJ) were applied to peach (Prunus persica L. Batsch, cv Stark Red Gold) branches during S2 phase (rapid growth). In treated fruit ethylene production and the evolution of the main fruit quality parameters were inhibited and transcript levels of PpACO1, PpERS1 and PpETR1 were altered in comparison to respective controls. Increases in polyamine titres were associated to JA-induced ripening delay probably contributing to the observed antisenescent effect. A fragment of PpAOS cDNA was isolated and its expression monitored during fruit ripening showing that the corresponding transcript was enhanced in JA-treated fruit. Finally, a microarray comparative trascriptome profiling of treated versus control fruit indicated that MJ down-regulate genes positively involved in ripening thus confirming that JAs slow down such process in peach fruit.
Ziosi V., Bregoli A.M., Bonghi C., Rasori A., Biondi S., Costa G., et al. (2007). Jasmonates delay ripening by interfering with ethylene biosynthesis and perception and with polyamine accumulation in peach fruit. DORDRECHT : A. Ramina et al..
Jasmonates delay ripening by interfering with ethylene biosynthesis and perception and with polyamine accumulation in peach fruit
ZIOSI, VANINA;BREGOLI, ANNA MARIA;BIONDI, STEFANIA;COSTA, GUGLIELMO;TORRIGIANI, PATRIZIA
2007
Abstract
Jasmonates (JAs), which derive from α -linolenic acid through allene oxide synthase (AOS), are signal molecules which elicit stress responses through JA-induced proteins (JIPs). They are also involved in growth processes such as cell division, tuber formation and fruit development. JAs induce various biological responses mostly correlated with defense responses; however, their reciprocal relationships with ethylene are not well established. In apple and cherries endogenous JAs peak during the early phase of fruit growth; but only in apple they rise again at climacteric. A JA derivative, methyl jasmonate (MJ), stimulates ethylene production in pre-climacteric apples but inhibits it in climacteric ones. However, MJ-induced apple degreening is partly independent of ethylene. A better established relation is be that between JAs and PAs. PAs are ubiquitous growth regulators involved in fruit set and development; when applied to developing fruit they inhibit ethylene production and delay ripening in peach and other climacteric fruit. To better understand the relationships JA-ethylene in a climacteric fruit, in the present study, MJ and its synthetic analogous propyl jasmonate (PJ) were applied to peach (Prunus persica L. Batsch, cv Stark Red Gold) branches during S2 phase (rapid growth). In treated fruit ethylene production and the evolution of the main fruit quality parameters were inhibited and transcript levels of PpACO1, PpERS1 and PpETR1 were altered in comparison to respective controls. Increases in polyamine titres were associated to JA-induced ripening delay probably contributing to the observed antisenescent effect. A fragment of PpAOS cDNA was isolated and its expression monitored during fruit ripening showing that the corresponding transcript was enhanced in JA-treated fruit. Finally, a microarray comparative trascriptome profiling of treated versus control fruit indicated that MJ down-regulate genes positively involved in ripening thus confirming that JAs slow down such process in peach fruit.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
