Safa Khosravi; Babak ValizadehKaji; Ahmadreza Abbasifar
Abstract
Consumption of vegetables with high nitrate content threaten human health. Garden cress is a hyperaccumulator of nitrate and quickly accumulates a large amount of nitrate. The objective of the current study was to investigate the effects of foliar application of selenium (Se) on the morphological and ...
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Consumption of vegetables with high nitrate content threaten human health. Garden cress is a hyperaccumulator of nitrate and quickly accumulates a large amount of nitrate. The objective of the current study was to investigate the effects of foliar application of selenium (Se) on the morphological and physiochemical traits of garden cress plants. Treatments included three levels of sodium selenite (1, 2, and 4 mg L-1) and three levels of green synthesized Se nanoparticles (NPs) (1, 2, and 4 mg L-1). Most nutrient treatments, especially 1 mg L-1 Se NPs, significantly increased plant height, number of leaves, fresh and dry weights, chlorophyll a, total chlorophyll, and nitrate reductase activity of garden cress plants. The foliar application of Se, especially 1 mg L-1 Se NPs, caused a significant decrease in the level of nitrate accumulation. Under different treatments of sodium selenite and green synthesized Se NPs on garden cress plants, the concentration of Se was increased, and concentrations of zinc and phosphorus were decreased. This research highlights the implications of Se for improving the quality and quantity of garden cress plants.
Fereshteh Kamiab; Sadegh Shahmoradzadeh Fahreji; Elahe Zamani Bahramabadi
Abstract
Increasing quality and vase life of cut flowers play vital role in flower production industry. . Lisianthus (Eustoma grandiflora cv. Echo) has short vase life and it has been revealed that ethylene directly affect the initiation and process of senescence of petals. In this study, the effects of ...
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Increasing quality and vase life of cut flowers play vital role in flower production industry. . Lisianthus (Eustoma grandiflora cv. Echo) has short vase life and it has been revealed that ethylene directly affect the initiation and process of senescence of petals. In this study, the effects of Silver and silicon nanoparticles with four concentrations of 0, 10, 20 and 40 mg L-1 with 4% sucrose as a support solution were evaluated on post-harvest life of ‘Cinderella Lime’ Lisianthus. The morphological and physiological parameters such as microbial population, flower vase life, relative fresh weight, solution uptake, total chlorophyll, ethylene and total dissolved solids were measured. Results revealed that all treatments extended the flower vase life when compared to control. The most effective treatment was the Highest concentration of nanoparticles (40 mg L-1). The average vase life of flowers was about 5 days in control (without any nano particle treatments) however; it reached to 17 days in flowers treated by 40 mg L-1 of both nanoparticles. Relative fresh weight, solution uptake, total chlorophyll, and total dissolved solids were also increased in the treated flowers, especially at higher concentrations. Microbial proliferations were not observed by application of both nanoparticles (Silver or Silicon) at 40 mg L-1 therefore this concentration was considered as the most effective level for both nanoparticles. Nano silver were more effective than silicon for reducing ethylene content. Overall the results suggest that silicon nanoparticle (40 mg L-1) is applicable as antimicrobial compound in combination with silver nanoparticles (40 mg L-1) as ethylene signaling inhibitor to increase the vase life of Lisianthus flowers commercially.
