Plant Productions

Effect of different intensities of continuous red and blue LED light on yield and secondary metabolites synthesis of basil microgreens

Afsaneh Abbasi; Naser Alemzadeh Ansari; Mohammadreza Fayezizadeh

Articles in Press, Accepted Manuscript, Available Online from 10 December 2024

https://doi.org/10.22055/ppd.2024.48202.2220

Abstract

Introduction Basil microgreen (Ocimum basilicum L.) is a valuable plant belonging to the Lamiaceae family, which is known as a superfood in the 21st century due to its high antioxidant ... Read More Introduction Basil microgreen (Ocimum basilicum L.) is a valuable plant belonging to the Lamiaceae family, which is known as a superfood in the 21st century due to its high antioxidant index, including phenolic compounds, flavonoids, and carotenoids. In addition to their antioxidant and nutritional properties, microgreens are introduced as one of the strategic products that can be produced in vegetable production factories due to their short growth period, compatibility with soilless cultivation systems, ability to be cultivated in layered cultivation systems and high profitability. However, there are several challenges facing vegetable producers that hinder the development of microgreen cultivation. One of the most important production parameters is light intensity, the results of which are limited on the performance and synthesis of basil microgreen secondary metabolites in past research. Materials and Methods This research was conducted in the Department of Horticultural Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, in February 2024. This experiment aims to investigate the effect of different intensities of red+blue continuous LED light with a ratio (1:1) including 18 (82.8 µmol m-2 s-1), 36 (165.6 µmol m-2 s-1), 54 (248.4 µmol m-2 s-1) and 72 (331.2 µmol m-2 s-1) Wm-2s-1 on the yield and synthesis of secondary metabolites of three cultivars (Kapoor, Red Rubin, Violetta) and one genotype (Abloq) of basil microgreen were investigated using a split-plot approach based on a randomized complete block design in a floating system with four replications. Results and Discussion The results showed that the simple effect of light intensity on all studied traits had a significant difference at the 1% level. Also, the simple effect of cultivar and the interaction between light intensity and cultivar on all studied traits created a significant difference. The highest and lowest yield were obtained in Red Rubin cultivar (4.1 kg m-2) with light intensity of 331.2 µmol m-2 s-1 and in Violetta cultivar (0.5 kg m-2) with light intensity of 82.8 µmol m-2 s-1, respectively. The highest antioxidant capacity (78.31%), anthocyanin (31.0 mg 100 g-1 of fresh weight), vitamin C (306.1 mg 100 g-1 of fresh weight) and phenolic compounds (2039.6 mg 100 g-1 of fresh weight) were measured in Ablaq genotype under light intensity of 331.2 µmol m-2 s-1. The highest amount of proline was measured in Red Rubin cultivar (3.61 mg g-1 fresh weight) grown under a light intensity of 331.2 µmol m-2 s-1 and the lowest amount of proline was measured in Ablaq genotype (1.55 mg g-1 fresh weight) under light intensity of 82.8 µmol m-2 s-1. The highest amount of flavonoids was measured in Violetta cultivar (8.42 mg g-1 fresh weight) under light intensity of 331.2 µmol m-2 s-1 and the lowest amount of flavonoids was measured in Red Rubin cultivar (3.45 mg g-1 fresh weight) under light intensity of 82.8 µmol m-2 s-1. Basil microgreen performance with antioxidant capacity, anthocyanin, carbohydrate, proline, vitamin C, total phenolic compounds, and flavonoids had a positive and significant correlation at the 1% level. Conclusion The light intensity of red+blue LED lamps affected the synthesis of secondary metabolites and the yield of basil microgreens. Based on the results of the Ablaq genotype under the light intensity of 331.2 µmol m-2 s-1, it can be used as a suitable method for growing basil microgreens in the floating system.

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Foliar Application of Potassium Nitrate and Silicate Can Improve the Fruit Quality of Pomegranate cv. ‘Malase Yazdi’

Elham Fattahi; Azam Jafari; Esmaeil Fallahi

Volume 43, Issue 4 , December 2021, , Pages 527-534

https://doi.org/10.22055/ppd.2020.31693.1846

Abstract

ABSTRACT Introduction:Pomegranate is an ancient fruit plant, that nowadays there is an increasing worldwide demand for this fruit owing to its superior pharmacological and therapeutic ... Read More ABSTRACT Introduction:Pomegranate is an ancient fruit plant, that nowadays there is an increasing worldwide demand for this fruit owing to its superior pharmacological and therapeutic properties. Foliar nutrient applications could potentially be used in commercial pomegranate production, to improve fruit quality. Therefore, the current study was conducted to investigate the physicochemical properties of pomegranate fruits under foliar spraying of potassium nitrate and silicate. Materials and Methods:The twenty years old uniform pomegranate trees cv. ‘Malase Yazdi’ that have grown on a commercial orchard in Ardakan, Iran were selected during the 2017–2018 growing seasons. Five levels of potassium spraying treatments were used. The foliar spray treatments included: 250 and 500 mg/l potassium nitrate; 250 and 500 mg/l potassium silicate and distilled water (control). The foliar spray was carried out two times. The first stage was after the conversion of most of the flowers to the fruit and when fruits reached about walnut size, from June to July, and the second stage of the foliar application was at the end of the fruit growth, in mid-September. At the time of the harvest, healthy fruits were taken from the middle of the crown of each tree in different directions, and qualitative and quantitative characteristics of the harvested fruits were analyzed. Physicochemical properties such as fruit and total aril weight, seed dry weight, peel fresh weight, fruit volume and juice, soluble solids concentration (SSC), maturity index, color, total phenol content, and vitamin C were investigated. Results and Discussion:Results showed that all of foliar treatments increased fruit volume and weight, total aril weight, fruit juice, and color and decreased seed dry weight, compared to control treatment (without nutrient treatment). KNO3 (250 mg/l) increased SSC and maturity index and 500 mg/l KNO3 increased both valuable characteristics: total phenol and vitamin C content. Also potassium silicate improved vitamin C content compared to the control treatment. Conclusion: The nitrogen in potassium nitrate increases the amount of the carbohydrate reserves that affects the fruit growth and development, thus reducing water stress and competition between fruits, which leads to the increased growth and development of fruits. The use of foliar application of potassium silicate has many advantages in enhancing the leaf area and improving the efficiency of photosynthesis and increasing the plant's ability to increase growth and yield and to increase strength, and reduce temperature stress. Therefore, according to these results, and due to the increasing global desire to use pomegranate fruit because of its high nutritional value, foliar application of potassium nitrate and silicate is recommended in pomegranate orchards.

Effects of Harvesting Time and Fruit Size on Physical and Biochemical Properties of Pomegranate Fruit cv. ‘Rabab Neiriz’ in Ghalletol-Baghmalak

Fatemh rashno nuzhad; norola moallemi; seyad mohamad hasan Mortazavi

Volume 39, Issue 3 , December 2016, , Pages 27-38

https://doi.org/10.22055/ppd.2016.12065

Abstract

Background and Objectives Pomegranate (Punica granatum) is a nonclimacteric fruit rcent respectively. In general, the results of the present study confirmed that the medium fruit size ... Read More

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Keywords = Vitamin C

Effect of different intensities of continuous red and blue LED light on yield and secondary metabolites synthesis of basil microgreens

Abstract

Foliar Application of Potassium Nitrate and Silicate Can Improve the Fruit Quality of Pomegranate cv. ‘Malase Yazdi’

Abstract

Effects of Harvesting Time and Fruit Size on Physical and Biochemical Properties of Pomegranate Fruit cv. ‘Rabab Neiriz’ in Ghalletol-Baghmalak

Abstract