Postharvest illumination of alstroemeria: Effect of light quality on flower metabolism and shelf life

• Published in: Postharvest biology and technology 2023-07, Vol.201, p.112346, Article 112346
• Main Authors: Pintos, Federico, Nico, Andrés, Rodoni, Luis, Cieza, Ramón, Hasperué, Joaquín
• Format: Article
• Language: English
• Subjects: abscission; Alstroemeria; ambient temperature; anthocyanins; chlorophyll; color; flower size; flower tepals; leaves; light quality; lighting; metabolism; Red-blue light; refrigeration; Senescence; shelf life; sugar content; Sugars; Tepal area; vase life; White light; Yellowing
• ISSN: 0925-5214; 1873-2356
• DOI: 10.1016/j.postharvbio.2023.112346

Despite the good postharvest performance of alstroemeria flowers, leaf yellowing is one of the most important signs of senescence and decay, as well as the flower size and time to abscission. In this work, we tested the effect of 50 μmol m−2 s−1 white (WL, broad spectrum) and red-blue (RBL, 40:60, 630 + 465 nm) light-emitting diodes on cut alstroemeria stored at 20 °C, or WL on cut alstroemeria stored at 5 °C, on postharvest flower quality and vase life. The light-treated floral stems had higher water consumption throughout storage compared to the controls stored in the dark, with no variation in stem diameter. The tepal area was increased by the light treatment at both storage temperatures. The leaf color remained similar to that at harvest in the light-treated flower stems (WL and RBL), while there was a strong yellowing in the controls stored in the dark. Anthocyanins increased mostly in flowers stored under WL, although this was more evident at 20 °C. WL treatment strongly slowed chlorophyll degradation and increased sugar content in leaves and tepals by 3.4 and 1.8 times, respectively, at 20 °C, and by 6 and 2.9 times, respectively, at 5 °C. The increase in sugar levels in light-treated flowers may have caused the tepal expansion but also delayed the onset of leaf senescence, and consequently the tepal abscission. The WL was the most effective storage condition not only to extend cut alstroemeria shelf life, but also to improve the postharvest flower quality, both at room temperature and under refrigeration. [Display omitted] •Different light-emitting diodes (LED) delayed leave and flower senescence.•Light treatments favored pigment retention.•Sugars increased strongly in floral stems under light treatments.•White light treatment was more effective than red-blue at room temperature.•White light improved the flowers and leaves quality at room or at cold storage.