UV-B Radiation Mediated Alterations in the Nitrate Assimilation Pathway of Crop Plants 1. Kinetic Characteristics of Nitrate Reductase

Balakumar, T.; Selvakumar, V.; Sathiameena, K.; Ilanchezhian, C. Murugu; Paliwal, Kailash

doi:10.1023/a:1007116012323

Cited by 14 publications

(4 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The response of soybean plants to a+s UV-B and SMF pretreatment in this study was in accordance with several earlier studies on soybean (Baroniya et al 2013(Baroniya et al , 2014Kataria et al 2017). Related studies reported that an enhanced or supplemental UV-B radiation could significantly reduce the NR activity in soybean (Rockel 2002), maize (Quaggiotti et al 2004), Vigna (Balakumar et al 1999), and barley (Ghisi et al 2002). The NR reducing activity also influences the nitrogen metabolism by influencing photosynthetic machinery (Baroniya et al 2014).…”

Section: Discussionsupporting

confidence: 92%

Static magnetic field treatment enhanced photosynthetic performance in soybean under supplemental ultraviolet-B radiation

et al. 2021

View full text Add to dashboard Cite

The study was performed to analyze the impact of seed pretreatment by static magnetic field (SMF) of 200 mT for 1 h on photosynthetic performance of soybean (Glycine max) seedlings under ambient ( a UV-B) and supplemental ultraviolet-B ( a+s UV-B) stress. Ambient and supplemental UV-B were found to decrease the plant growth, chlorophyll concentration, PSII efficiency, selected JIP-test parameters such as F v /F m , φEo, ΔV(I-P), PI ABS , PI total , and rate of photosynthesis in the leaves of soybean seedlings emerged from untreated (UT) seeds. a UV-B and a+s UV-B were observed to increase the synthesis of UV-B-absorbing substances (UAS), reactive oxygen species (ROS) like superoxide radical (O 2•− ) and hydrogen peroxide (H 2 O 2 ), antioxidants like ascorbic acid and α-tocopherol and decrease the nitrate reductase (NR) activity; subsequently, it results in a decreased rate of photosynthesis, biomass accumulation, and yield. However, our results provided evidence that SMF pretreatment increased the tolerance of soybean seedlings to UV-B radiation by increased NO content and NR activity; higher efficiency of PSII, higher values of φEo, ΔV(I-P), PI ABS , and PI total , decreased intercellular CO 2 concentration, lower amount of UAS, ROS, and antioxidants that consequently improve the yield of soybean plants under a UV-B as well as a+s UV-B stress. Thus, our results suggested that SMF pretreatment mitigates the adverse effects of UV-B stress by the enhancement in photosynthetic performance along with higher NO content which may be able to protect the plants from the deleterious effects of oxidative stress caused by UV-B irradiation.

show abstract

Section: Discussionsupporting

confidence: 92%

Static magnetic field treatment enhanced photosynthetic performance in soybean under supplemental ultraviolet-B radiation

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Both the leaves and roots showed decreased values of NRA after exposure to UV-B radiation in comparison with control seedlings (Quaggiotti et al 2004), in agreement with data obtained in Vigna unguiculata L. (Balakumar et al 1999) and barley (Ghisi et al 2002).…”

Section: Ultra-violet B Radiationsupporting

confidence: 90%

Review: Nitrogen assimilation in crop plants and its affecting factors

et al. 2012

View full text Add to dashboard Cite

Mokhele, B., Zhan, X., Yang, G. and Zhang, X. 2012. Review: Nitrogen assimilation in crop plants and its affecting factors. Can. J. Plant Sci. 92: 399–405. In this review we discuss mainly nitrogen assimilation in crop plants and factors affecting the related process. Nitrogen is a major macro-element limiting the growth and development of plants in agriculture. Both organic and inorganic forms of nitrogen are metabolized in plants; nitrate and ammonia in soil are common forms of inorganic nitrogen that can be metabolized in all plants. There are other nitrogen forms, which include amino acids, nitrite and urea, that are metabolized in plants. Metabolism normally starts with reduction of nitrate to nitrite, and the latter further reduces to form ammonium with the presence of relevant enzymes. This reaction occurs more rapidly in leaves in the presence of light. After ammonia is formed, it enters into the biosynthetic pathways of plant cells, such as reductive amination and transpiration, to produce different amino acids. Amino acids in cells take part in the synthesis of protein and other nitrogenous compounds that help in body building. Radiation, gaseous factors, the presence of metals, soil pH and amount of nitrate are some of the environmental factors affecting absorption and reduction of nitrogen in plants. This review presents a comprehensive understanding of the assimilation process by crop plants of nitrogen and recommends that favorable surrounding conditions are the prerequisites for plants to absorb and utilize nitrogen efficiently.

show abstract

“…Recently Balakumar et al. (1999) found altered activity and kinetic characteristics of leaf nitrate reductase in cowpea plants exposed to UV‐B.…”

Section: Discussionmentioning

confidence: 99%

Carbon and nitrogen metabolism in barley plants exposed to UV‐B radiation

Ghisi¹,

Trentin²,

Masi³

et al. 2002

Physiologia Plantarum

View full text Add to dashboard Cite

The effect of UV-B radiation on FW, leaf and stem length, photosynthetic O2 evolution, levels of carbohydrates and nitrates, and extractable activities of some of the enzymes involved in C and N metabolism was evaluated in barley (Hordeum vulgare L. cv. Express) seedlings during the 9 days following transfer to an UV-B enriched environment. The results show that under our experimental conditions UV-B radiation scarcely affects the photosynthetic competence of barley leaves, expressed as RuBP carboxylase (EC 4.1.1.39) activity, O2 evolution rate and chlorophyll content. Nevertheless, this treatment induced significant alterations of the enzyme activity of nitrate reductase (EC 1.6.6.1) and glutamine synthetase (EC 6.3.1.2), although only after a few days of treatment. The effects were not confined to the exposed tissue, but were detectable also at the root level. In fact, nitrate reductase decreased in response to UV-B in both leaf and root tissue, whereas glutamine synthetase was affected only in the root. In contrast, nitrate content was not influenced by the treatment, neither in root nor in leaf tissue, whilst leaf sucrose diminished in exposed plants only on the last day of treatment.

show abstract

UV-B Radiation Mediated Alterations in the Nitrate Assimilation Pathway of Crop Plants 1. Kinetic Characteristics of Nitrate Reductase

Cited by 14 publications

References 35 publications

Static magnetic field treatment enhanced photosynthetic performance in soybean under supplemental ultraviolet-B radiation

Static magnetic field treatment enhanced photosynthetic performance in soybean under supplemental ultraviolet-B radiation

Review: Nitrogen assimilation in crop plants and its affecting factors

Carbon and nitrogen metabolism in barley plants exposed to UV‐B radiation

Contact Info

Product

Resources

About