Effect of Nitrogen Application on Growth Parameters, Yield and Leaf Nitrate Content of Greenhouse Lettuce Cultivated During Three Seasons

Konstantopoulou, Eleni; Kapotis, Georgios; Salachas, Georgios; Petropoulos, Spyridon Α.; Chatzieustratiou, E.; Karapanos, Ioannis; Passam, H. C.

doi:10.1080/01904167.2012.676135

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…The fact that in the present study Na content in leaf tissues was significantly lower than previously reported for the species by Petropoulos et al (2017) could suggest that plants tends to accumulate nitrates to serve as osmoregulatory factors under spring conditions where high temperatures increase water requirements and water uptake. Moreover, according to Konstantopoulou et al (2012), the application of 260 mg L…”

Section: Resultsmentioning

confidence: 99%

Successive harvesting affects yield, chemical composition and antioxidant activity of Cichorium spinosum L.

et al. 2017

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a b s t r a c tIn the present study, the effect of successive harvesting on yield, chemical composition and antioxidant activity of Cichorium spinosum plants was examined. C. spinosum plants were grown from seeds sown in seed trays containing peat and young seedlings were transplanted in 2L pots containing peat and perlite (1:1 v/v). Plants were harvested two or three times during two consecutive growing periods. Total fresh weight and number of leaves were higher for successive harvests in both growing periods comparing to a single harvest. The application of more than two harvests resulted in quality loss during the 1st growing period, while in the 2nd growing period the overall chemical composition, antioxidant properties and phenolic compounds content was higher than the 1st period. In conclusion, cultivation practices such as sowing date and successive harvesting may be useful tools towards the production of high quality end-product with increased bioactive properties without compromising total yield.

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Section: Resultsmentioning

confidence: 99%

Successive harvesting affects yield, chemical composition and antioxidant activity of Cichorium spinosum L.

et al. 2017

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“…Replacement of part of the nitrate fertilizer with ammonium nitrogen is an advantageous practice to avoid nitrate accumulation without negative consequences on crop yield [18,19,24,28,30]. However, caution should be taken to ensure that a critical minimum level of mineral nitrogen for sustaining plant growth and crop yield is not surpassed and, additionally, mineral nitrogen manipulation does not induce nutritional quality deterioration [1,2,8,26,[31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Effect of Reduced Nitrogen and Supplemented Amino Acids Nutrient Solution on the Nutritional Quality of Baby Green and Red Lettuce Grown in a Floating System

et al. 2020

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Excessive nitrogen fertilization results in nitrate accumulation in leafy vegetables. Reducing the dose of mineral nitrogen or using alternate fertilizers lowers the nitrate accumulation; however, a critical minimum level of mineral nitrogen is necessary to maintain yield and nutritional quality. The aim of this study was to evaluate the effect of two levels of mineral nitrogen (100% and 50%) and three levels of an amino acid solution (0, 0.3, and 0.9%) in the nutrient solution of two baby lettuce cultivars (green and red) grown in a floating system. Nitrogen reduction did not affect yield (12.9–13.4 and 11.0–11.3 g/plant, respectively) but reduced nitrate accumulation (by 43 and 19%, respectively) in both green and red lettuce, while enhancing phenolic content (by 28%) and antioxidant capacity (by 69%) in green lettuce and soluble solid (by 7%) and total chlorophyll content (by 9%) in red lettuce. Although nitrate accumulation was prevented (< 355 mg/kg FW) and most nutritional components increased in both lettuce types by amino acids supplementation, plant growth was negatively affected, especially in red lettuce, in both concentrations of amino acids (reduction by 9 and 35% in 0.3 and 0.9%, respectively). In both lettuce types, proline content increased by 0.9% amino acids supplementation (by 45%), implying a probable induction of a stress condition. Mineral nutrients were slightly affected by nitrogen reduction, which was probably perceived as an abiotic stress.

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“…ROS are produced permanently by the photosynthetic apparatus but especially under biotic and abiotic stress, such as nutrient deficiency [ 15 ]. During N deficiency, chlorophyll concentrations and photosynthesis decrease [ 16 ]. A malfunctioning photosystem renders the plant in danger of oxidative damage which can explain the increasing concentrations of flavonoids [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…The photosynthetic rate in nitrogen-deficient lettuce is lowered [ 16 ] and hence the plant’s carbohydrate pool is reduced. Sugar concentration has been related to flavonoid biosynthesis in several plants species and organs [ 23 – 25 ].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Limited Red and Green Leaf Lettuce Accumulate Flavonoid Glycosides, Caffeic Acid Derivatives, and Sucrose while Losing Chlorophylls, Β-Carotene and Xanthophylls

et al. 2015

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Reduction of nitrogen application in crop production is desirable for ecological and health-related reasons. Interestingly, nitrogen deficiency can lead to enhanced concentrations of polyphenols in plants. The reason for this is still under discussion. The plants’ response to low nitrogen concentration can interact with other factors, for example radiation intensity. We cultivated red and green leaf lettuce hydroponically in a Mediterranean greenhouse, supplying three different levels of nitrogen (12 mM, 3 mM, 0.75 mM), either in full or reduced (-50%) radiation intensity. In both red and green lettuce, we found clear effects of the nitrogen treatments on growth characteristics, phenolic and photosynthetic compounds, nitrogen, nitrate and carbon concentration of the plants. Interestingly, the concentrations of all main flavonoid glycosides, caffeic acid derivatives, and sucrose increased with decreasing nitrogen concentration, whereas those of chlorophylls, β-carotene, neoxanthin, lactucaxanthin, all trans- and cis-violaxanthin decreased. The constitutive concentrations of polyphenols were lower in the green cultivar, but their relative increase was more pronounced than in the red cultivar. The constitutive concentrations of chlorophylls, β-carotene, neoxanthin, all trans- and cis-violaxanthin were similar in red and green lettuce and with decreasing nitrogen concentration they declined to a similar extent in both cultivars. We only detected little influence of the radiation treatments, e.g. on anthocyanin concentration, and hardly any interaction between radiation and nitrogen concentration. Our results imply a greater physiological plasticity of green compared to the red lettuce regarding its phenolic compounds. They support the photoprotection theory regarding anthocyanins as well as the theory that the deamination activity of phenylalanine ammonia-lyase drives phenylpropanoid synthesis.

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Effect of Nitrogen Application on Growth Parameters, Yield and Leaf Nitrate Content of Greenhouse Lettuce Cultivated During Three Seasons

Cited by 12 publications

References 29 publications

Successive harvesting affects yield, chemical composition and antioxidant activity of Cichorium spinosum L.

Successive harvesting affects yield, chemical composition and antioxidant activity of Cichorium spinosum L.

Effect of Reduced Nitrogen and Supplemented Amino Acids Nutrient Solution on the Nutritional Quality of Baby Green and Red Lettuce Grown in a Floating System

Nitrogen Limited Red and Green Leaf Lettuce Accumulate Flavonoid Glycosides, Caffeic Acid Derivatives, and Sucrose while Losing Chlorophylls, Β-Carotene and Xanthophylls

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