Nitrate Reduction and Nutrient Accumulation in Wheat Grown in Soil Salinized with Four Different Salts

Iqbal, Naeem; Ashraf, Muhammad; Javed, Farrukh; Martı́nez, Vicente; Ahmad, Kafeel

doi:10.1080/01904160500524852

Cited by 36 publications

(27 citation statements)

References 29 publications

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“…It is to be expected that reduced uptake of nitrate would lead to lower activity of nitrate reductase, as has been observed for other species (Hamdia et al 2004; Iqbal et al 2006; Debouba et al 2007; Hasaneen et al 2008), although only the first study included data for roots as in our study . Probably, the close relationship between nitrate assimilation and amino acid biosynthesis explains the reduced levels of free amino acids found in roots of C. cajan plants after salt treatment.…”

Section: Discussionsupporting

confidence: 60%

24-epibrassinolide restores nitrogen metabolism of pigeon pea under saline stress

et al. 2013

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BackgroundSeveral studies have shown that brassinosteroids attenuate the effects of salt stress. However, nothing is known about their effects on amino acid transport, nor the effects of these hormones on nitrate uptake under saline conditions. This study set out to determine the effects of 24-epibrassinolide, at concentrations of 10-7 M and 0.5 × 10-9 M, and clotrimazole (inhibitor of brassinosteroid synthesis), at 10-4 M, on nitrate uptake and metabolism in plants of C. cajan (L.) Millsp, cultivar C11, growing under salinity. The following aspects were analyzed: levels of proteins, amino acids, nitrate, nitrate reductase of roots and the composition of xylem sap amino acids.ResultsSalinity reduced the proportion of N-transport amino acids ASN (the major component), GLU, ASP and GLN. The effect of the hormone in reducing the adverse effects of salt was related to the reestablishment (totally or partially) of the proportions of GLU, ASN and GLN, transported in the xylem and to the small but significant increase in uptake of nitrate. Increased nitrate uptake, induced by 24- epibrassinolide, was associated with a higher activity of nitrate reductase together with greater levels of free amino acids and soluble proteins in roots of plants cultivated under saline conditions.ConclusionThe decline in several components of nitrogen metabolism, induced by salt, was attenuated by 24-epibrassinolide application and accentuated by clotrimazole, indicating the importance of brassinosteroid synthesis for plants growing under salinity.Electronic supplementary materialThe online version of this article (doi:10.1186/1999-3110-54-9) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 60%

24-epibrassinolide restores nitrogen metabolism of pigeon pea under saline stress

et al. 2013

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“…Increased levels of salinity have been consistently shown to decrease leaf NR activity (Iqbal et al. , Debouba et al. ).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen Assimilation and Growth of Cotton Seedlings under NaCl Salinity and in Response to Urea Application with NBPT and DCD

Kawakami¹,

Oosterhuis

Snider

2012

J Agronomy Crop Science

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Salinity stress and inefficient nitrogen fertilization adversely affect cotton growth and yield. The effect of salinity on the growth and stress response of cotton seedlings and the effect on N‐use efficiency from the use of the inhibitors of urease (NBPT) and nitrification (DCD) under salinity stress were studied in growth chambers. The study consisted of three levels of salinity – low (0.45 dS m−1), moderate (8 dS m−1) and high (16 dS m−1) – and five N treatments – unfertilized control, 100 % N rate with urea, 80 % N rate with urea, 80 % N rate with urea +NBPT and 80 % N rate with urea +NBPT + DCD. The results indicated that salinity stress reduced plant growth (low leaf area and plant dry matter), decreased N assimilation (low NR, GS and protein), increased plant stress response (high GR and SOD), and decreased leaf chlorophyll, stomatal conductance and quantum yield. Addition of NBPT to urea improved N uptake by 22 % under low salinity; however, this effect was not observed with increasing salinity. No benefit of addition of DCD was observed in any of the parameters collected. In conclusion, salinity stress hindered the performance of the additive NBPT and negatively affected the growth and physiology of cotton.

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“…The nutrients available, competitive uptake, and transport or compartmentalizing within plant tissue were affected by many factors in soil-plant environment. The ascending salinity levels significantly reduced potassium (K + ) and calcium (Ca 2+ ) accumulation in shoots, while the concentration of sodium (Na + ) was increased [12]. High concentration of Na + in soil solution or rhizosphere may reduce nutrient uptake and the Ca 2+ /Na + and K + /Na + ratios within plant tissues.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Cation Ratios on Root Lamella Suberization in Rice (Oryza sativaL.) with Contrasting Salt Tolerance

Momayezi

Zaharah

Hanafi

2012

International Journal of Agronomy

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Rice is an important produced cereal in the world. We evaluated the effect of salt compositions including NaCl and Na 2 SO 4 on suberin lamellae as a major barrier to radial ion and water movements in two rice genotypes representing contrasting salt tolerance levels under salinity stress. Two rice genotypes, Fajr as salt tolerant and Khazar as salt sensitive, were transplanted in sand culture under glasshouse condition. Rice seedlings were treated with five salt compositions including NaCl, Na 2 SO 4 , 1 : 1, 1 : 2, and 2 : 1 molar ratios for 40 days. It was proven that suberin lamellae in endodermis of root cell wall were thickened with Na 2 SO 4 treatment. The results demonstrated that the number of passage cells was higher in Fajr genotype than that in Khazar genotype under saline condition. Calcium concentration in root tissue decreased as the SO 4 2− concentration in root media increased. It can be concluded that Fajr genotype is able to keep some passage cells open to maintain Ca 2+ uptake. The Ca 2+ /Na + ratio in shoot tissue can be also a reliable index for the early recognition of salt stress in these rice genotypes.

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Nitrate Reduction and Nutrient Accumulation in Wheat Grown in Soil Salinized with Four Different Salts

Cited by 36 publications

References 29 publications

24-epibrassinolide restores nitrogen metabolism of pigeon pea under saline stress

24-epibrassinolide restores nitrogen metabolism of pigeon pea under saline stress

Nitrogen Assimilation and Growth of Cotton Seedlings under NaCl Salinity and in Response to Urea Application with NBPT and DCD

The Effects of Cation Ratios on Root Lamella Suberization in Rice (Oryza sativaL.) with Contrasting Salt Tolerance

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