Azizollah Khandan-Mirkohi; Elmira Rabiee; Behrouz Janipour; Ahmad Ahmadi
Abstract
Enrichment of zeolite and sponge as ethylene absorbent with potassium permanganate was theidea of this study to provide an efficient way to scavenge ethylene during storage period ofthree Rosa hybrida cv. ‘Shiraz’, ‘Avalanche’, and ‘After-party’ cut flowers. A preliminaryexperiment ...
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Enrichment of zeolite and sponge as ethylene absorbent with potassium permanganate was theidea of this study to provide an efficient way to scavenge ethylene during storage period ofthree Rosa hybrida cv. ‘Shiraz’, ‘Avalanche’, and ‘After-party’ cut flowers. A preliminaryexperiment revealed that two mL of potassium permanganate solution (1 mM) was enough toenrich two grams of zeolite and two cm3 of sponge. Additionally, one μL L-1 of externalethylene also found to be effective on induction of quality damage to certain cut flowers ofrose cultivars, which were selected for injection in each isolated container for furtherevaluations. The treatments used in this study included control (without absorbent), enrichedzeolite or sponge, enriched zeolite or sponge + ethylene (one μL L-1). The quality of flowers,weight, number of dropped petals, electrical conductivity of vase solution, ethyleneconcentration in the container and petal anthocyanins evaluated through/the end ofexperiment. Results revealed that change or reduction in the quality parameters were minor(more maintenance or stability of quality was achieved) with enriched zeolite and thenenriched sponge compared to the control. Enriched zeolite could even maintain the quality ofcut flowers at the level of control under external ethylene injection superior to enrichedsponge treatment. ‘Avalanche’ and ‘Shiraz’ cultivars figured as the most sensitive andresistant cultivars to the evaluated level of external ethylene concentration, respectively.
Azizolah Khandan-Mirkohi; Mahdieh Khalili Halbi; Seyed Alireza Salami; Hosein Lesani
Abstract
To study effects of salicylic acid (SA) treatments (0, 0.5, 1 and 2 mM) in two forms of seed priming (for 24 h) and spraying on seedling at 4-6 leaf stage an experiment was conducted on periwinkle (Catharanthus roseus Don.) with and without exposure to a mild cold stress of 8 °C (for 32 h). Seeds ...
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To study effects of salicylic acid (SA) treatments (0, 0.5, 1 and 2 mM) in two forms of seed priming (for 24 h) and spraying on seedling at 4-6 leaf stage an experiment was conducted on periwinkle (Catharanthus roseus Don.) with and without exposure to a mild cold stress of 8 °C (for 32 h). Seeds were sown in trays containing peat-based substrate (with 20% sandy loam field soil). Transplants of both groups were treated with mild cold. Seedlings were grown in greenhouse with an average day/night temperature of 25/20± 2°C until their blooming. Seed emergence rate and percentage, activities of catalase (CAT), guaiacol peroxidase (GPX), polyphenol oxidase (PPO), CAT gene expression, height and number of nodes per plant, and days to flowering were evaluated. Results showed that mild cold stress together with salicylic acid at 0.5 mM (as either seed priming or spray on seedling) was the best treatment to accelerate the flowering, and improve growth parameters and antioxidant enzymatic activities. Thus, mild cold stress enhanced the positive effects of SA treatments on cold acclimation of periwinkle (particularly when associated with spraying, which is a simple administration method). Accordingly, it might be recommended for its seedling production and cultivation in temperate climates to prevent late spring frost damages.
