Nitrogen metabolism as affected by hexavalent chromium in sorghum (Sorghum bicolor L.)

Kumar, Sandeep; Joshi, U. N.

doi:10.1016/j.envexpbot.2008.02.005

Cited by 48 publications

(23 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decrease in the activity of NiR might have been associated with the decrease in the nitrite that is a substrate of the reduction reaction catalyzed by NiR. Finally, the decrease in the activities of NR and NiR might also be a combined result of decreased NO À 3 uptake or carbon fixation by roots and the low NO À 3 translocation in the xylem [40]. These hypotheses should be investigated in the future.…”

Section: Discussionmentioning

confidence: 99%

Effects of bisphenol A on growth and nitrogen nutrition of roots of soybean seedlings

Sun

Wang

Zhou

2012

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Abstract-Bisphenol A (BPA) is an environmental endocrine disruptor that seriously threatens ecological systems. Plants are the primary producers in ecological systems, but little information is available concerning the toxic effect of BPA on plants. In the present study, the effects of BPA on the growth and nitrogen nutrition of roots of soybean seedlings were investigated by using a root automatic scan apparatus and biochemical methods. It was found that when soybean seedlings were treated with 1.5 mg/L BPA, the growth of roots was improved, the content of nitrate in roots was increased, the content of ammonium in roots was decreased, and the activities of nitrate reductase and nitrite reductase in roots were not changed. The opposite effects were observed in roots treated with 17.2 mg/L and 50.0 mg/L BPA, except for an increase in the content of nitrate in roots treated with 17.2 mg/L BPA and a decrease in the activities of nitrate reductase and nitrite reductase in roots of soybeans seedlings. Statistical analysis indicated that the change in the nitrogen nutrition of roots of soybean seedlings treated with BPA was one reason why the growth of roots was changed. The authors suggest that the potential environmental and ecological risk of BPA to plants should receive more consideration. Environ. Toxicol. Chem.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of bisphenol A on growth and nitrogen nutrition of roots of soybean seedlings

Sun

Wang

Zhou

2012

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

show abstract

“…Reduction in both GOGAT and GS activities has been attributed to oxidative modifications of these enzyme proteins (Balestrasse et al 2006). As Cr and excess GA both are known to stimulate generation of ROS which might be related partially to the oxidative destruction of these enzymes (Mori and Schroeder 2004;Celik et al 2007;Kumar and Joshi 2008;Pandey et al 2009b). However, addition of 10 lM GA together with Cr increased GOGAT and GS activities in root and shoot compared to Cr treatments alone indicating proper incorporation of NH 4 ?…”

Section: Discussionmentioning

confidence: 99%

“…Hexavalent Cr is highly toxic because of its ability to cross plasma membrane with powerful oxidizing capability (Shanker et al 2004). Chromium (VI) phytotoxicity inhibits seed germination, growth and photosynthesis, decreases uptake of nutrient elements, alters water balance, and affects nitrogen and sulfur metabolism (Shanker et al 2004;Vernay et al 2007; Kumar and Joshi 2008;Schiavon et al 2008). It has been reported that toxic property of Cr(VI) originates from the formation of reactive oxygen species (ROS), i.e.…”

Section: Introductionmentioning

confidence: 99%

Modification of chromium (VI) phytotoxicity by exogenous gibberellic acid application in Pisum sativum (L.) seedlings

et al. 2010

View full text Add to dashboard Cite

“…Assimilation of NH 4 + plays an important role in plant growth and development which determines yield and quality of grains [11]. It has been shown that enzymes of NH 4 + assimilation are severely affected by different metals and thus reduced crop yields [10,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Kinetin Supplementation Modifies Chromium (VI) Induced Alterations in Growth and Ammonium Assimilation in Pea Seedlings

Gangwar

Singh

Garg

et al. 2011

Biol Trace Elem Res

View full text Add to dashboard Cite

In the present study, impact of kinetin (KN; 10 and 100 μM) supplementation on growth, ammonium (NH(4)(+)) assimilation and antioxidant system in pea under hexavalent chromium toxicity (Cr VI; 50, 100 and 250 μM) was investigated. Chromium decreased growth, protein, and nitrogen, and activity of glutamine synthetase (GS) and glutamate synthase (GOGAT) while it increased NH(4)(+) content and activity of glutamate dehydrogenase (GDH). Kinetin at 100 μM decreased growth and NH(4)(+) assimilation, and together with Cr, it increased Cr toxicity. Chromium and 100 μM KN increased superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities while decreasing activities of catalase (CAT), glutathione reductase (GR) and dehydroascorbate reductase (DHAR). Ascorbate and glutathione levels were decreased by Cr and 100 μM KN. In contrast, supplementation of 10 μM KN under Cr (VI) toxicity, protected NH(4)(+) assimilation and promoted growth of pea by increasing levels of some of the antioxidants i.e., CAT, GR, DHAR, ascorbate and glutathione. Results showed that 10 μM KN increases Cr tolerance while 100 μM KN exhibited opposite responses. These results could contribute to an understanding of the mechanisms of KN-mediated dual influence on metal tolerance in crop plants.

show abstract

Nitrogen metabolism as affected by hexavalent chromium in sorghum (Sorghum bicolor L.)

Cited by 48 publications

References 25 publications

Effects of bisphenol A on growth and nitrogen nutrition of roots of soybean seedlings

Effects of bisphenol A on growth and nitrogen nutrition of roots of soybean seedlings

Modification of chromium (VI) phytotoxicity by exogenous gibberellic acid application in Pisum sativum (L.) seedlings

Kinetin Supplementation Modifies Chromium (VI) Induced Alterations in Growth and Ammonium Assimilation in Pea Seedlings

Contact Info

Product

Resources

About