Iron Mediated Nitrate Reductase Activity in Different Parts of Young Maize Seedlings

Pandey, Sarita

doi:10.1023/a:1026583803876

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…It is well known that exogenous application of NO 3 may increase the nitrate content of salt stressed plant and improves the tolerance of plant to salinity to various extents (Ebert et al, 2002;Kaya and Higgs, 2003). Foliar application of KNO 3 was found to increase nitrate content of ryegrass leaves under non-saline or saline condition (Tabatabaei and Fakhrzad, 2008) and NR activity and protein content in tomato and maize (Maritinez and Cerda ,1989;Panday, 2000).…”

Section: Introductionmentioning

confidence: 96%

Foliar Application of Potassium Nitrate Affects the Growth and Nitrate Reductase Activity in Sunflower and Safflower Leaves under Salinity

Jabeen

Ahmad

2011

Not Bot Hort Agrobot Cluj

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Effect of foliar application of KNO3 on growth and the activity of nitrate reductase were studied in the leaves of sunflower (Helianthus annuus L.) and safflower (Carthamus tinctorius L.) plants growing under different levels of salinity. The seeds were sown in pots under non saline condition and saline water irrigation was started at three leaf stage after germination. Different concentration of saline water (i.e. 0.3% and 0.6%, equivalent to an EC of 4.8 and 8.6 dS/m respectively) were made by dissolving sea salt per litre of tap water. Nutrient solution of KNO3 was sprayed at the rate of 250 ppm. The concentration of Na+ and Cl- rapidly increased in the leaves of both the plants under salinity stress. In contrast the nitrate (NO3-) and soluble protein concentration were decreased with the increasing salinity. Salinity reduced leaf area, its fresh and dry weight per plant and also inhibited the activity of Nitrate reductase (NRA) enzyme. The application of KNO3 significantly reduced the increasing tendency of Na+ and Cl- and increased leaf area, its fresh and dry weight per plant, NO3- and soluble protein concentration and NR activity in leaves irrespective to the growth of plant under non saline or saline conditions.

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Section: Introductionmentioning

confidence: 96%

Foliar Application of Potassium Nitrate Affects the Growth and Nitrate Reductase Activity in Sunflower and Safflower Leaves under Salinity

Jabeen

Ahmad

2011

Not Bot Hort Agrobot Cluj

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Chromium increases photosystem 2 activity in Brassica juncea

Gupta¹,

Srivastava²,

Saradhi³

2009

Biol. plant.

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In 7-d-old seedlings of Brassica juncea chromium (VI) promoted photosystem 2 (PS 2) mediated photoreactions. The increase in PS 2 activity in the thylakoids from Cr-treated seedlings, in the presence of uncoupler (5 mM NH 4 Cl), was similar to that recorded with the control thylakoids. Thus Cr enhanced PS 2 activity was not due to uncoupling of electron transport from photophosphorylation. Photon saturation kinetics revealed that the PS 2 activity of thylakoids from Cr-treated seedlings was significantly higher at almost all irradiances in comparison to that of controls. PS 2 activity of thylakoids from Cr-treated plants at 25 % of the saturating irradiance was in par with the PS 2 activity of the thylakoids from control plants at saturating irradiance. Thylakoids from both control and Cr-treated seedlings exhibited maximum PS 2 activity at pH 7.5. The PS 2 activity of thylakoids from Cr-treated plants remained high even at pH 8.0 and 8.5, demonstrating Cr enhances tolerance of PS 2 to alkaline pH.

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Genotypic variation of the responses to chromium toxicity in four oilseed rape cultivars

Gill

Ali

et al. 2014

Biol. plant.

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Heavy metal toxicity in soils has been considered as major constraints for oilseed rape (Brassica napus L.) production.In the present study, toxic effects of chromium (Cr) were studied in 6-d-old seedlings of four different cultivars of B. napus (ZS 758, Zheda 619, ZY 50, and Zheda 622). The elevated content of Cr inhibited seedling growth, decreased the content of photosynthetic pigments, and activities of antioxidant enzymes, as well as increased the content of malondialdehyde and reactive oxygen species in all the cultivars. The Cr content in different parts of plants was higher in Zheda 622 than in other cultivars. The electron microscopic study showed changes in ultrastructure of leaf mesophyll and root tip cells at 400 µmol Cr, and these changes were more prominent in Zheda 622. An increased size and number of starch grains and number of plastoglobuli, damaged thylakoid membranes, and immature nucleoli and mitochondria were observed in leaves. In roots, enlarged vacuoles, disrupted cell walls and cell membranes, an increased number of mitochondria and a size of nucleolus, as well as plasmolysis (in Zheda 622) were observed. On the basis of these findings, it can be concluded that cv. Zheda 622 was more sensitive to Cr as compared to other three cultivars.

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Iron Mediated Nitrate Reductase Activity in Different Parts of Young Maize Seedlings

Cited by 5 publications

References 13 publications

Foliar Application of Potassium Nitrate Affects the Growth and Nitrate Reductase Activity in Sunflower and Safflower Leaves under Salinity

Foliar Application of Potassium Nitrate Affects the Growth and Nitrate Reductase Activity in Sunflower and Safflower Leaves under Salinity

Chromium increases photosystem 2 activity in Brassica juncea

Genotypic variation of the responses to chromium toxicity in four oilseed rape cultivars

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