Abstract
Due to the dynamic development of the floriculture market, new species and varieties of plants that can potentially be used as a source of cut greenery are constantly being sought. The experiment was conducted to analyze the effect of the cultivation site (unheated foil tunnel and open field) and treatments with the Pentakeep V formulation (0.00%, 0.02%, 0.04%, and 0.06%) on the vase life and postharvest quality of Polygonatum multiflorum ‘Variegatum’ cut foliage. There was a positive effect of the cultivation in the unheated foil tunnel on the vase life and biochemical parameters, namely the electrolyte leakage (EL), thiobarbituric acid reactive substances (TBARS), chlorophyll a + b (Chl. a + b), proline, peroxidase (POD), and ascorbate peroxidase (APX), of P. multiflorum cut foliage. Foliar application of Pentakeep V formulation at concentrations of 0.04% and 0.06% contributed to a decrease in the TBARS content in the P. multiflorum cut leaves, regardless of the plant cultivation site. Additionally, it reduced proline production in cut leaves of P. multiflorum cultivated in the unheated foil tunnel, which was confirmed by the analyses carried out after the 30 days of the experiment. Furthermore, the exogenous application of ALA during P. multiflorum cultivation inhibited POD activity, irrespective of its concentration and the site of plant cultivation.
Highlights
In the last decade, there has been a continuous increase in the importance of cut greenery as a floristic material worldwide [1]
It reduced proline production in cut leaves of P. multiflorum cultivated in the unheated foil tunnel, which was confirmed by the analyses carried out after the 30 days of the experiment
The plants growing in the tunnel and in the field were divided into four plots and sprayed six times with aqueous solutions of Pentakeep V (Pentakeep®, Cosmo Seiwa Agriculture Co., Ltd., Osaka City, China), which contains 0.3% aminolevulinic acid (ALA), 9.5% N, 5.7% Mg, 0.3% Mn, and 0.45% B, as well as DTPA-Fe, ZnSO4, CuSO4, and dinatiummolibdenat
Summary
There has been a continuous increase in the importance of cut greenery as a floristic material worldwide [1]. Senescence of leaves that have been cut off from the parent plant is an inevitable rapid process, evident especially in the final phase of ontogenesis, in which irreversible changes are initiated, leading to gradual cell degradation and death of the organism [2]. Excision of an organ from the mother plant results in water and oxidative stress, the adverse effect of which is intensified at the successive stages of trading and accelerates the process of aging of cut foliage. Oxidative stress, which is defined as imbalance between reactions generating reactive oxygen species (ROS) and neutralizing reactions [3], may appear in plant cells as secondary stress, caused by, e.g., water stress [4]. One of the phenomena occurring during senescence of cut foliage and inflorescence is accumulation of ROS and activation of the enzymatic antioxidant defense
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