Plant Productions

Effect of Harmel Extract on Bacterial Population in Vase Solution and Vase Life of ‘Stanza’ and ‘Pink Elegance’ Cultivars of Gerbera Cut Flower

Meisam Mohammadi; Mitra Aelaei; Mehdi Saidi

Volume 43, Issue 2 , September 2020, , Pages 171-184

https://doi.org/10.22055/ppd.2019.27785.1680

Abstract

Abstract Background and ObjectivesGerbera is one of the important cut flowers in the floriculture industry, but it is sensitive to early wilting and neck bending which reduce its ... Read More Abstract Background and ObjectivesGerbera is one of the important cut flowers in the floriculture industry, but it is sensitive to early wilting and neck bending which reduce its postharvest vase life. In cut flowers, water deficits are created when transpiration is more than water absorption. Therefore, petal wilting and neck bending increase in these flowers. These conditions are mainly due to occlusion of the vascular bundle, which can occur in different ways, such as the activity of pathogenic bacteria and other microorganisms in vascular bundle. In recent years, due to the adverse effects of chemical antimicrobial compounds on human health and the environment, many studies have been conducted to find replacement materials to maintain the quality and vase life of cut flowers in postharvest. Therefore, in this study, the effect of different concentrations of harmel aqueous-alcoholic extract (Peganum harmala L.) on bacterial population and vas life of ‘Stanza’ and ‘Pink Elegance’ cultivars of Gerbera cut flower were studied. Materials and MethodsThe effect of concentrations 0, 0.25, 0.5, 0.75 and 1% of the aqueous-alcoholic extract of Harmel plant was studied in a factorial experiment based on completely randomized design with four replications. At harvest time, 3, 6 and 9 days after harvest (at 20 °C and 70% relative humidity), the effect of treatments on the bacterial population of the vase solution and end stem, vase life and some characteristics of ‘Stanza’and ‘Pink Elegance’ Gerbera cut flowers were studied. ResultsThe results showed that the inhibitory effect of harmal extracts on gram-positive bacteria was higher than gram-negative bacteria. Also,‘Stanza’cultivar had better quality and longer vase life than ‘Pink Elegance’ cultivar. By increasing the vase life of flowers, the quality of these flowers decreased. In the first place, however, concentrations of 0.25% and then 0.5% of the harmal extract performed better than other treatments in various aspects: first, they reduced the bacterial solution, stem end, and electrolyte leakagein stem and petals; second, they preserved quality (discolored of vase solution, discolored of petals and stem), relative fresh weight, stem diameter, totalsolublesolids, catalase activity and phenylalanine ammonia lyase activity; and finally, they increased vase life of gerbera flowers in both cultivars. Concentrations of 0.75% and 1% increased allelopathic substances in cut flower. While these treatments decreased the bacterial population in vase solution and stem end, they did not have a significant effect on the quality and vase life of gerbera cut flowers. DiscussionThe results of this study showed that the different concentrations of harmal extract significantly reduced the growth of microbial agents, including the bacterial population, but by increasing the concentration of the harmal extract, the allelopathic effects of this plant extract on gerbera cut flowers were harmful and did not affect their vase life and quality. Therefore, the concentration of 0.25% then 0.5% reduced the bacterial populations in vase solution and stem end of cut flowers and preserved the quality and vase life of ‘Stanza’ and ‘Pink Elegance’ cultivars. Therefore, the use of low concentrations of the harmel aqueous-alcoholic extract is recommended to reduce the microbial population of the vase solution and maintain the quality and vase life of the gerbera cut flowers.

Effect of potassium nitrate (KNO3) on some morphological and physiological characteristics of two tropical lawn (Cynodon dactylon L. and paspalum vaginatum L.) under salinity stress condition

Kh. Asadi vafa; M. Seiedi; M. Chehrazi; M. Sayari; N. Moallemi

Volume 38, Issue 2 , September 2015, , Pages 121-133

https://doi.org/10.22055/ppd.2015.11325

Abstract

High level of sodium chloride is known to be the most widespread cause of saline soil environmental stress in dry and semi dry lands that ceases growth and yield of crop species. An ... Read More

Effect of 5- aminolevulinic acid on changes of water deficit stress tolerance index and catalase activity of sweet pepper seedlings (Capsicum annuum L. cv. red bell pepper)

Z. khazaei; M. Sayyari; M. Seydi

Volume 37, Issue 4 , March 2014, , Pages 79-92

Abstract

To study the effect of 5- aminolevulinic acid (ALA) on some physiological responses of sweet pepper under drought stress, a factorial experiment in a randomized complete block design ... Read More

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Author = M. Seiedi

Effect of Harmel Extract on Bacterial Population in Vase Solution and Vase Life of ‘Stanza’ and ‘Pink Elegance’ Cultivars of Gerbera Cut Flower

Abstract

Effect of potassium nitrate (KNO3) on some morphological and physiological characteristics of two tropical lawn (Cynodon dactylon L. and paspalum vaginatum L.) under salinity stress condition

Abstract

Effect of 5- aminolevulinic acid on changes of water deficit stress tolerance index and catalase activity of sweet pepper seedlings (Capsicum annuum L. cv. red bell pepper)

Abstract