Effects of Promoters and Inhibitors of Ethylene and ABA on Flower Senescence of Hibiscus rosa-sinensis L.
Articolo
Data di Pubblicazione:
2011
Citazione:
Effects of Promoters and Inhibitors of Ethylene and ABA on Flower Senescence of Hibiscus rosa-sinensis L. / A. Trivellini, A. Ferrante, P. Vernieri, A. Mensuali-Sodi, G. Serra. - In: JOURNAL OF PLANT GROWTH REGULATION. - ISSN 0721-7595. - 30:2(2011), pp. 175-184.
Abstract:
Hibiscus rosa-sinensis L. flowers (cv La France) senesce and die over a 12-h period after opening. The aim of this study was to examine the physiological mechanisms regulating the senescence process of phemeral hibiscus
flowers. Different flower stages and floral organs were used
to determine whether any interaction existed during flower
senescence between endogenous abscisic acid (ABA) and
the predisposition of the tissue to ethylene synthesis.
This was carried out on whole flowers treated with promoters
and inhibitors of ethylene and ABA synthesis or a
combination of them. Treatments with 1-aminocyclopropane-
1-carboxylic acid (ACC), a precursor of ethylene
biosynthesis, enhanced flower senescence, whereas aminooxyacetic
acid (AOA) and fluridone, an ethylene and an
ABA inhibitor, respectively, extended flower longevity.
These effects were more significant when applied before
anthesis. Ethylene evolution was substantially reduced in
all organs from open and senescent flowers treated with
fluridone and AOA. Similarly, endogenous ABA accumulation
was negatively affected by AOA and fluridone treatments. Application of fluridone plus ACC reduced
ethylene evolution and increased ABA content in a tissuespecific
manner but did not overcome the inhibitor effect
on flower longevity. AOA plus fluridone treatment slightly
accelerated flower longevity compared to AOA-treated
flowers. Application of ABA alone promoted senescence,
suppressed ethylene production, and, when applied with
fluridone, countered the fluridone-induced increase in
flower longevity. Taken together, these results suggest that
the senescence of hibiscus flowers is an endogenously
regulated ethylene- and ABA-dependent process.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Abscisic acid; ACC; AOA; Ethylene; Flower organs; Fluridone; Ovary; Petal; Style-stigma plus stamens
Elenco autori:
A. Trivellini, A. Ferrante, P. Vernieri, A. Mensuali-Sodi, G. Serra
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