Response of radish seedlings ( Raphanus sativus L.) to different concentrations of ammoniacal nitrogen in absence and presence of silicon

Viciedo, Dilier Olivera; Prado, Renato de Mello; Toledo, Rodolfo Lizcano; Santos, L.; Calzada, Kolima Peña

doi:10.15446/agron.colomb.v35n2.62772

Cited by 23 publications

(10 citation statements)

References 23 publications

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“…Although the beneficial role of Si in the alleviation of different abiotic stresses is well documented, 5,13,18,19 little is currently known regarding the relevance of Si in the physiology of plants subjected to toxic levels of NH 4 + . We hypothesized that NH 4 + toxicity in radish seedlings might be mitigated by the incorporation of Si into the nutrient solution used in hydroponic cultivation.…”

Section: Discussionmentioning

confidence: 99%

Physiological role of silicon in radish seedlings under ammonium toxicity

et al. 2020

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BACKGROUND: High concentrations of ammonium as the sole nitrogen source may result in physiological and nutritional disorders that can lead to reduced plant growth and toxicity. In this study, we hypothesized that ammonium toxicity in radish seedlings (Raphanus sativus L.) might be mitigated by the incorporation of silicon (Si) into applied nutrient solution. To examine this possibility, we conducted a hydroponic experiment to evaluate the effects of five concentrations of ammonium (1, 7.5, 15, 22.5, and 30 mmol L −1) on the photosynthesis, green color index, stomatal conductance, transpiration, instantaneous wateruse efficiency, and biomass production of radish in the absence and presence (2 mmol L −1) of Si. The experimental design was a randomized block design based on a 2 × 5 factorial scheme with four replicates. RESULTS: The highest concentration of applied ammonium (30 mmol L −1) was found to reduce the photosynthesis, transpiration and total dry biomass of radish seedlings, independent of the presence of Si in the nutrient solution. However, at lower ammonium concentrations, the application of Si counteracted these detrimental effects, and facilitated the production of seedlings with increased photosynthesis, greater instantaneous water-use efficiency, and higher total dry biomass compared with the untreated plants (without Si). Transpiration and stomatal conductance were affected to lesser extents by the presence of Si. CONCLUSION: These findings indicate that the addition of Si to nutrient solutions could provide an effective means of alleviating the unfavorable effects induced by ammonium toxicity at concentrations of less than 30 mmol L −1 .

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Section: Discussionmentioning

confidence: 99%

Physiological role of silicon in radish seedlings under ammonium toxicity

et al. 2020

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“…The high phytotoxicity observed, could be because of high ammonium content observed in the treatment (Figure 4), since radish is considered sensitive to high ammonium content. For instance, in the study conducted by Olivera Viciedo, et al [61] on the response of radish to difference ammonical nitrogen concentrations in absence and presence of silicon, observed highest sensitivity in treatments without silicon. In the cow manure treatment with E. fetida only, the highest germination observed agree with findings of Bernal, et al [62] who found increased GI value of radish from between 24 to 120 h of germination using cow manure vermicompost using E. fetida.…”

Section: 5mentioning

confidence: 98%

Influence of Microbial Inoculation of Igneous Rock Phosphate-Amended Cow and Pig Manures on Vermidegradation and Nutrient Release

et al. 2020

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Vermicomposting using Eisenia fetida has been shown to improve phosphorus mineralization from rock phosphate (RP). There is, however, a lack of information on the potential of integrating microbial inoculants like phosphate-solubilizing bacteria (PSB) during vermicomposting as a way of improving vermidegradation, and the release of nutrients from igneous RP-amended composts. This study evaluated the potential of using Eisenia fetida and Pseudomonas fluorescence in enhancing the vermidegradation, and nutrient release in igneous RP- amended cow and pig manure-based vermicomposts at a C/N ratio of 30. Compost maturity, nutrient and phytotoxicity parameters were measured to determine vermicompost quality. Final vermicompost results showed that the pig manure treatments achieved greater maturity as indicated by lower C/N of 10.3, high humification index (HI) of 7.6%, and humification ratio (HR) of 12.89% in the treatment with E. fetida and P. fluorescence. The inclusion of E. fetida alone in cow manure treatment resulted in the highest Olsen P of 2600 mg/kg, followed by the pig manure treatment with E. fetida only (2246.15 mg/kg). In conclusion, both E. fetida and P. fluorescence are necessary in the vermicomposting of RP-enriched pig and cow manure for efficient vermi-degradation and nutrient release.

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“…Nitrogen is the second most required nutrient by plants (Viciedo et al, 2017). It is an essential macro-element that participates in the synthesis of amino acids, nucleic acids, secondary metabolites, and components of the chlorophyll molecule.…”

Section: Introductionmentioning

confidence: 99%

Chlorophyll a fluorescence and development of zucchini plants under nitrogen and silicon fertilization

et al. 2020

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Zucchini (Cucurbita pepo L.) has a great economic and productive potential in the semi-arid region of Brazil, due to the wide acceptance by consumers and quick financial return. The nitrate (NO3-) assimilation process in C3 plants such as zucchini is related to photorespiration, and Si accumulated near the stomata reduces the transpiration rate, making the photosynthesis cycle more efficient. The objective of this study was to evaluate the interaction between nitrogen and silicon fertilization ongrowth, chlorophyll index, and chlorophyll a fluorescence of zucchini plants. The treatments were distributed in a split-plot scheme in a randomized block design with three replicates. The plot was arranged by silicon levels (0 and 6 g/plant) and the subplots constituted by five nitrogen levels (30, 60, 90, 120 and 150 kg ha-1). Leaf, stem and total dry masses, chlorophylla, chlorophyll b, total chlorophyll, chlorophyll a/b ratio and chlorophyll a fluorescence were evaluated. The highest dry matter productions in zucchini were obtained in treatments without Si. Si and N application together positively influences the chlorophyll a/b ratio of zucchini plants. The interaction between Si and N positively influences the maximum fluorescence, variable fluorescence and quantum yield of photosystemII of zucchini plants.

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Response of radish seedlings ( Raphanus sativus L.) to different concentrations of ammoniacal nitrogen in absence and presence of silicon

Cited by 23 publications

References 23 publications

Physiological role of silicon in radish seedlings under ammonium toxicity

Physiological role of silicon in radish seedlings under ammonium toxicity

Influence of Microbial Inoculation of Igneous Rock Phosphate-Amended Cow and Pig Manures on Vermidegradation and Nutrient Release

Chlorophyll a fluorescence and development of zucchini plants under nitrogen and silicon fertilization

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