Data di Pubblicazione:
2004
Citazione:
Role of abscisic acid in perianth senescence of daffodil / D. A. Hunter, A. Ferrante, P. Vernieri, M. S. Reid. - In: PHYSIOLOGIA PLANTARUM. - ISSN 0031-9317. - 121:2(2004), pp. 313-321. [10.1111/j.0031-9317.2004.0311.x]
Abstract:
Daffodil (Narcissus pseudonarcissus L. ‘Dutch Master’)
flowers detached at the base of their ovaries and held with
their cut ends in 10–100 uM abscisic acid (ABA) senesced
prematurely. Symptoms of the ABA treatment included
water-soaking of the tepals and early collapse of the corona.
No water-soaking was seen in tepals of flowers held in water.
Instead, the tepals of these flowers dried. The ABA content
increased in tepals of the potted flowers as they senesced. The
rise in tepal ABA content coincided with the appearance of
visual signs of senescence. When the flowers were cut and
placed in water, a treatment that accelerated their senescence,
the increase in ABA occurred earlier. Exogenously applied
ABA enhanced the premature accumulation of senescenceassociated
transcripts in the tepals. Their ABA-mediated
induction was not prevented when the flowers were pre-treated
with 1-methylcyclopropene, an inhibitor of ethylene action,
indicating that ABA induced the transcripts independently
of ethylene. The transcripts accumulated in opened control
flowers before the rise in endogenous ABA. Attempts to
extend floral longevity by using putative inhibitors of ABA
biosynthesis [tungstate, fluridone (applied as Sonar1) and 1,1-
dimethyl-4-(phenylsulphonyl)semicarbazide (DPSS)] were
unsuccessful. However, inclusion of 100 mM gibberellic acid
(GA3) in the vase solution reduced the senescence-inducing
effects of 50 uM ABA suggesting a possible mechanism for
in-vivo control of senescence.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Daffodil ; senescence ; postharvest
Elenco autori:
D.A. Hunter, A. Ferrante, P. Vernieri, M.S. Reid
Link alla scheda completa: