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Postharvest physiology and volatile production by flowers of Ptilotus nobilis

Able, Amanda J. and Smyth, Heather and Joyce, Daryl (2014) Postharvest physiology and volatile production by flowers of Ptilotus nobilis. Postharvest Biology and Technology, 88 . pp. 61-71. ISSN 0925-5214

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Article Link(s): http://dx.doi.org/10.1016/j.postharvbio.2013.10.00...

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0925521413002986

Abstract

Ptilotus nobilis (Lindl.) F. Muell. has potential in the floriculture industries as a cut flower crop. Ethylene production and respiration rates, fresh weight changes and volatile scent production from cut inflorescences of P. nobilis cultivars Passion (dark pink flowers) and Purity (white-green flowers) were measured during vase life. Inflorescence weight loss was significant (P < 0.001) during vase life with wilting and colour loss being the primary reasons for loss of vase life. Inflorescences ready for the cut market stored and at 22 °C had vase lives of >12 d. Ethylene production by inflorescences was low to negligible. Treatment with silverthiosulphate (STS) and ethylene had no effects on vase life. Evidently, ethylene did not play a role in determining the postharvest longevity of cut P. nobilis flowers. Respiration rates of inflorescences were high at harvest (>700 mg CO2 kg−1 FW h−1) and declined gradually thereafter during vase life. Total volatile emissions followed a similar pattern. For Passion, respiration rates of immature florets were significantly greater (P = 0.02) than florets from other developmental stages while the calyx produced the most CO2. For Purity, respiration rates of florets of different maturities did not differ and the reproductive tissue produced the most CO2. Only fully opened mature florets with their stigma and anthers revealed, emitted significant quantities of volatiles (P < 0.001) and primarily from the calyx tissue for both cultivars. The individual volatiles differed somewhat for the two cultivars. However, both produced significant quantities of benzaldehyde, 3,5-dimethoxytoluene and benzyl alcohol. These compounds have previously been associated with desirable floral scent.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Cut flower Floral scent Floret maturity Respiration Vase life Volatiles
Subjects:Plant culture > Flowers and flower culture. Ornamental plants
Plant culture > Flowers and flower culture. Ornamental plants > Preservation and reproduction of flowers, fruits, etc
Deposited On:01 Feb 2016 06:56
Last Modified:01 Feb 2016 06:56

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