Genetic Variability in Nitrogen Use Efficiency of Spring Barley

Anbessa, Yadeta; Juskiw, P. E.; Good, Allen G.; Nyachiro, J. M.; Helm, J. H.

doi:10.2135/cropsci2008.09.0566

Cited by 85 publications

(75 citation statements)

References 27 publications

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“…Dawson et al (2008) suggested that under these conditions, plants are unable to assimilate enough N and losses rise resulting in low NUE. In our study, highest NUE and grain yield was recorded for genotypes GLU 1356 and GLU 2001 under sub-optimal doses of N. Field studies on barley have clearly shown differences in the NUE of various genotypes (Abeledo et al, 2008;Anbessa et al, 2009), which can be improved by increasing N uptake and NUE under low N supply (Moose and Below, 2009;Beatty et al, 2010). Very low NUE of even 6% was registered for wheat genotypes under 180 kg N ha -1 of urea ammonium nitrate which could be attributed to N loss to environment (Kanampiu et al, 1997).…”

Section: Discussionsupporting

confidence: 48%

Nitrogen Nutrition, its Assimilation and Remobilization in Diverse Wheat Genotypes

Kaur¹,

Asthir²,

Bains³

et al. 2015

IJAB

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Nitrogen is an essential element required for plant growth and development. However, over-use of nitrogen fertilizer is not only costly but also environmentally unsafe. Therefore, identification of genotypes possessing higher nitrogen use efficiency (NUE) at sub-optimal dose of nitrogen is the key challenge. In this study, effect of nitrogen on the activities of nitrogen assimilatory enzymes, total soluble proteins and amino acids was studied in wheat genotypes of diverse physiology (viz., GLU 1101, GLU 1356, GLU 2001. Nitrogen was applied at recommended dose (RDN), RDN-50%, RDN-25% and RDN+25% using urea as a source. With increase of nitrogen rate, significant increase in the activities of nitrate reductase, nitrite reductase, glutamine synthetase, glutamate synthase and glutamate dehydrogenase was noted, which caused an increase in protein and amino acid contents in all the genotypes. Activity pattern of studied enzymes revealed an increasing trend from tillering to anthesis stage and thereafter declined in parallel with decrease in protein and amino acid contents. Conversely, nitrogen and chlorophyll content showed a consistent decline with leaf growth. Genotypes GLU 1356 and GLU 2001 maintained higher activities of nitrogen assimilatory enzymes in parallel with higher NUE at RDN-50% and RDN-25%, while genotypes PH132-4836 and PH132-4840 were found to be promising at RDN+25%. A positive correlation of nitrogen assimilatory enzymes (nitrate reductase and glutamine synthetase) with NUE and nitrogen content was also observed indicating that these might be the rate limiting enzymes in nitrogen metabolism. In crux, 25% less than the recommended dose of nitrogen had significant influence on nitrogen metabolism especially in GLU 1356 and GLU 2001 due to high activities of nitrate reductase and glutamine synthetase. These nitrogen efficient genotypes may be exploited in enhancing wheat crop productivity under lower dose of nitrogen to save environment and input cost.

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Section: Discussionsupporting

confidence: 48%

Nitrogen Nutrition, its Assimilation and Remobilization in Diverse Wheat Genotypes

Kaur¹,

Asthir²,

Bains³

et al. 2015

IJAB

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“…The approach is here exemplified for winter wheat grown in Central Sweden (Table 1) and has recently been used by many authors (e.g. Anbessa et al 2009;Foulkes et al 2009;Sylvester-Bradley and Kindred 2009). The concept of Moll et al (1982) certainly is meaningful in an applied agronomic perspective with focus only on cereals, but has serious limitations especially when the NUE of different crops and production systems should be compared.…”

Section: Cereal Growth and Nitrogen Use Efficiencymentioning

confidence: 99%

Assessment of nutrient use in annual and perennial crops: A functional concept for analyzing nitrogen use efficiency

2010

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The use of more nutrient-efficient crops is important for maintaining yields while enhancing environmental sustainability. Various approaches are being applied to evaluate aspects of plant nutrient use efficiency, among them ecological concepts based on accumulation and losses of biomass and nutrients, agronomic concepts with a major focus on agricultural crops and harvested products, and physiological approaches assessing single physiological processes important for nutrient use. Unfortunately, the various approaches are often not compatible. Here we propose, with the example of nitrogen (N) use efficiency (NUE) of cereals, to integrate the functionally important components of NUE in a common conceptual framework. We link productivity to N in crops and seeds and consider the whole life-cycle of the crop (including seeds). Three major components of NUE are separated: The N uptake efficiency, grain-specific N efficiency and grain N concentration. The three components combine to a measure of overall NUE in terms of the N yield in harvested grain per unit of N in seed grain or soil N. The concept can be applied for both annual and perennial plants, which is demonstrated with the examples of winter wheat and a perennial energy crop (Salix) grown in Central Sweden.

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“…These include root length density and improve post-anthesis (after flower pollination/fertilization) re-translocation of N from straw. Anbessa et al (2009) suggest that NUE is significantly affected by both genotype and environment. Recent unpublished research (Ian Bingham, pers.…”

Section: Species Introductionmentioning

confidence: 97%

Nitrous oxide mitigation in UK agriculture

Rees

Baddeley

Bhogal

et al. 2013

Soil Science and Plant Nutrition

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Nitrous oxide (N 2 O) makes the single largest contribution to greenhouse gas (GHG) emissions from UK and European Union agriculture. Ambitious government targets for GHG mitigation are leading to the implementation of changes in agricultural management in order to reduce these emissions (mitigation measures). We review the evidence for the contribution of those measures with the greatest mitigation potential which provide an estimated 4.3 t CO 2e ha À1 y À1 GHG reduction in the UK. The mitigation options considered were: using biological fixation to provide nitrogen (N) inputs (clover, Trifolium), reducing N fertilizer, improving land drainage, avoiding N excess, fully accounting for manure/slurry N, species introduction (including legumes), improved timing of mineral fertilizer N application, nitrification inhibitors, improved timing of slurry and manure application, and adopting systems less reliant on inputs. These measures depend mostly on increasing the efficiency of N fertilizer use and improving soil conditions; however, they provide the added benefit of increasing the economic efficiency of farming systems, and can often be viewed as ''win-win'' solutions.

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Genetic Variability in Nitrogen Use Efficiency of Spring Barley

Cited by 85 publications

References 27 publications

Nitrogen Nutrition, its Assimilation and Remobilization in Diverse Wheat Genotypes

Nitrogen Nutrition, its Assimilation and Remobilization in Diverse Wheat Genotypes

Assessment of nutrient use in annual and perennial crops: A functional concept for analyzing nitrogen use efficiency

Nitrous oxide mitigation in UK agriculture

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