The effect of different nitrogen levels on yield and quality of stevia (<i>Stevia rebaudiana</i>bert.)

Uçar, Esra; Turgut, Kenan; Özyiğit, Yaşar; Özek, Temel; Özek, Gülmira

doi:10.1080/01904167.2018.1431673

Cited by 18 publications

(9 citation statements)

References 12 publications

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“…The increase in protein content may be due to the direct increase in nitrogen content in stevia leaves plant. These results were similar to those obtained by Uçar et al (2018).…”

Section: Protein Contentsupporting

confidence: 92%

Role of organic food wastes on soil fertility and stevia crop growth and its yield

Khalifa¹,

Youssef

Abd‐ElGawad

2020

Egypt.J. Soil Sci.

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during two successive growing seasons of 2018 and 2019. The study aims to assess the influence of organic food wastes (Eggshell, Banana peels, Green pea peels and Potato peels) are sources of some nutrients and Soybean protein isolate as a source of nitrogen on the soil fertility, growth parameters, yield and quality of stevia plant under drip irrigation system. The result showed positive increase in all growth parameters and yield of sativa plant as well as improving soil properties by adding organic food wastes. The most effective treatment was the combination of C 4 treatment (50% organic-N from isolated soy protein, 12.5% banana peels, 12.5% eggshell, 12.5% green pea peels and 12.5% potato peels). The highest total chlorophyll value of 4.48 and 3.61 mg/g fresh weight in the 1 st and 2 nd cutting, respectively in the 1 st season were obtained under C 4 treatment. The corresponding values were 4.89 and 4.02 mg/g fresh weight in the 2 nd season. The highest values of dry leaf yield 843 kg plot-1 and biological yield 1.60 kg plot-1 were noticed under C 2 treatment in the 2 nd cut in the first season. In the second season, the corresponding values were 1242 and 2.19 kg plot-1 resulted from C 4 treatment in the 2 nd cut. The highest values of protein content 10.73 and 13.72% in 1 st and 2 nd cut, respectively were realized under C 4 treatment in the 1 st season. The corresponding values were 15.0 and 18.11% for C 4 treatment in the 2 nd season. In the 1 st season, the highest values of stevioside content were 8.49 and 8.98 % in the 1 st and 2 nd cut for C 4 and C 2 , respectively. In the 2 nd season, the highest values of stevioside content were 9.69 and 10.05 % in the 1 st and 2 nd cut for C 2 treatments, respectively. Available N in C 0 treatment Control (without applied fertilizers) had the lowest values of both seasons compared to the C 4 treatment that had the highest values of both forms in both seasons. The overall results suggest that organic food wastes combination could be advised to grow stevia plant and improving soil properties of Egypt.

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“…The increase in protein content may be due to the direct increase in nitrogen content in stevia leaves plant. These results were similar to those obtained by Uçar et al (2018).…”

Section: Protein Contentsupporting

confidence: 92%

Role of organic food wastes on soil fertility and stevia crop growth and its yield

Khalifa¹,

Youssef

Abd‐ElGawad

2020

Egypt.J. Soil Sci.

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“…However, leaf and stem dry mass were lower at 150 kg•ha À1 urea compared with 60 kg•ha À1 . Ucar et al (2018) reported similarly that as N application rate increased from 0 to 100 kg•ha À1 , fresh and dry leaf yield and total biomass yield of field-grown stevia increased, but further increasing N to 150 or 200 kg•ha À1 did not further increase any of these yield parameters. Fertilizer concentration did not impact branch number in this study.…”

Section: Discussionmentioning

confidence: 74%

“…Previous studies evaluating nutritional requirements for stevia have focused on field production and pre-plant soil-incorporated fertilizers (Karimi and Moradi, 2018;Pal et al, 2015;Rashid et al, 2013;Ucar et al, 2018). Information on appropriate levels of water-soluble fertilizer for continuous fertigation of stevia produced in soilless media is not available.…”

Section: Discussionmentioning

confidence: 99%

“…For field-grown plants, increasing nitrogen (N) application rate from 30 to 90 kg•ha À1 (the highest level evaluated) increased branch number, dry leaf yield, and dry stem yield (Pal et al, 2015). Ucar et al (2018) determined that increasing N application rate from 0 to 100 kg•ha À1 increased dry leaf yield, but further increasing N application rate to 150 or 200 kg•ha À1 did not further increase the yield. However, these studies have primarily been conducted on field-grown plants and cannot be directly applied to greenhouse production in soilless media with continuous fertigation using water-soluble fertilizers.…”

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confidence: 99%

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Influence of Environmental Parameters, Pinching, and Ethephon Application on Growth and Branching of Potted Stevia

Warner

2022

horts

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Stevia (Stevia rebaudiana) is an herb grown commercially for the extraction of intensely sweet-tasting, non-caloric, steviol glycosides produced primarily in the leaves and used as a sugar substitute. While most stevia production occurs as an industrial field crop, more recently, consumer demand for stevia for home gardens and patio containers has increased. Research on how environmental inputs impact growth, branching, and flowering of stevia under greenhouse conditions for potted plant production is currently lacking. A series of experiments was conducted to quantify how methods to promote branching, fertilizer concentration, photoperiod and temperature impact branch production, growth and development, and flowering of stevia. Both manual decapitation and ethephon application increased lateral branch production, though hard pinching (cutting plants back to leave four nodes) yielded a more desirable plant architecture. Neither temperature nor fertilizer concentration impacted the number of branches produced by plants given a hard pinch. Shoot dry biomass was similar at fertilizer concentrations (applied at each watering) of 50, 100, and 200 mg⋅L−1 N, but decreased at 300 or 400 mg⋅L−1 N. Stevia responded to photoperiod as a facultative short-day plant, with earliest flowering occurring, both in days to flower and the number of nodes produced before flowering, at photoperiods <13 hours. The number of nodes produced on the longest branch increased as temperature increased from 17 to 26 °C. Plant height and longest branch length were shorter at 17 °C than at higher temperatures. The results of these studies indicate that for potted plant production, stevia should be grown under a photoperiod of 14 hours or longer with moderate nutrient levels, a minimum temperature of 20 °C, and plants should receive one or more manual pinches to promote branching.

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“…Therefore, it is of great signi cance to study the responses of walnut plants to nitrogen stress and to promote the establishment of a standardised fertilisation model for this crop. Some advances have been made in understanding the mechanism of plant responses to nitrogen stress (Uçar et al, 2018;Van Dingenen et al, 2019). When the supply of exogenous nitrogen is insu cient, the growth behaviour of plants is abnormal.…”

Section: Introductionmentioning

confidence: 99%

Transcriptome Analysis of Walnut Seedling Roots Under Nitrogen Starvation and Excess Nitrogen Stress

Song¹,

Zhang²,

Gao³

et al. 2021

Preprint

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Nitrogen is an essential core element in walnut seedling growth and development. However, nitrogen starvation and excessive nitrogen stress can cause stunted growth and development of walnut seedlings, and environmental pollution is also of concern. Therefore, it is necessary to study the mechanism of walnut seedling resistance to nitrogen stress. In this study, morphological and physiological observations and transcriptome sequencing of walnut seedlings under nitrogen starvation and excess nitrogen stress were performed. The results showed that walnut seedlings under nitrogen starvation and excess stress could adapt to the changes in the nitrogen environment by changing the coordination of their root morphology and physiological indexes. Based on an analysis of transcriptome data, 4911 differential genes (DEGs) were obtained (2180 were upregulated and 2731 were downregulated) in a comparison of nitrogen starvation and control groups. A total of 9497 DEGs (5091 upregulated and 4406 downregulated) were obtained in the comparison between the nitrogen overdose and control groups. When these DEGs were analysed, the differential genes in both groups were found to be significantly enriched in the plant’s circadian pathway. Therefore, we selected the circadian rhythm as the core focus for further analysis. We made some discoveries by analysing the gene co-expression network of nitrogen metabolism, circadian rhythm, and hormone signal transduction. (a) Nitrite nitrogen (NO2-) or Glu may act as a nitrogen signal to the circadian clock. (b) Nitrogen signalling may be input into the circadian clock by regulating changes in the abundance of the CRY1 gene. (c) After the nitrogen signal enters the circadian clock, the expression of the LHY gene is upregulated, which causes a phase shift in the circadian clock. (d) The RVE protein may send information about the circadian clock’s response to nitrogen stress back to the nitrogen metabolic pathway via the hormone transduction pathway. In conclusion, various metabolic pathways in the roots of walnut seedlings coordinated with one another to resist the ill effects of nitrogen stress on the root cells, and these coordination relationships were regulated by the circadian clock. This study is expected to provide valuable information on the circadian clock regulation of plant resistance to nitrogen stress.

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The effect of different nitrogen levels on yield and quality of stevia (Stevia rebaudianabert.)

Cited by 18 publications

References 12 publications

Role of organic food wastes on soil fertility and stevia crop growth and its yield

Role of organic food wastes on soil fertility and stevia crop growth and its yield

Influence of Environmental Parameters, Pinching, and Ethephon Application on Growth and Branching of Potted Stevia

Transcriptome Analysis of Walnut Seedling Roots Under Nitrogen Starvation and Excess Nitrogen Stress

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