Abstract
This study aimed to analyse the endogenous levels of free polyamines putrescine (Put), spermidine (spd) and spermine (spm) under the effect of 8-HQC (8-hydroxyquinoline citrate) and chlorine during cold storage of bird-of-paradise floral scapes. Flowers were selected, labelled and randomly distributed in recipients for postharvest trials. The base of flower scapes was immersed with pulsing treatments (Control, 100 chlorine, 250 or 500 mg L-1 8-HQC) for 48 h, thereafter, stored at 10.5 °C and 90% relative humidity for a period of 12 days. Flower parts were sampled for polyamines analysis at day 0, 4, 8 and 12 days during storage. All samples had higher Put levels than the control. Treatment with 500 mg L-1 8-HQC showed the highest Spd levels in bracts, while chlorine treatment had the highest Spm levels in stems.
Highlights
The polyamines (PAs) are low-weight aliphatic molecules present in all organisms
This study aimed to analyze the endogenous levels of free PAs (Put, Spd and Spm) as possible senescence marker for bird-of-paradise cut flowers treated with biocides under cold storage
High Put levels were observed in sepals after pulsed/treated with 100 mg L-1
Summary
The polyamines (PAs) are low-weight aliphatic molecules present in all organisms. The main PAs in higher plants are free putrescine (Put), spermidine (Spd) and spermine (Spm) or conjugated to phenolic acids and low-weight molecules (BOUCHEREAU et al, 1999; KUZNETSOV et al, 2007). Biocides are used in pulsing and vase solutions in order to preserve the full postharvest longevity of cut flowers. The most widely held and effective biocides are esters of hydroxyquinoline (HQ) and their effectiveness as an biocide in cut flower handling solutions is widely know (DAMUNUPOLA and JOYCE, 2008). Sulphate (HQS) and citrate (HQC) forms of HQ are commonly used to increase cut flower longevity by acidifying the vase solution and acting as antitranspirant limiting water
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