An Overview of Nutrient Use Efficiency and Strategies for Crop Improvement

Hawkesford, Malcolm J.

doi:10.1002/9780470960707.ch1

Cited by 40 publications

(45 citation statements)

References 60 publications

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“…4): Such expression patterns were apparent for TaG6PDH (8, significant only in the second leaf), TaSUSY2 (11), TaSS1 (4), TaAmy2 (6) and TaAmy4 (7) as well as TaSUSY1 (10, only second leaf), TaSS2 Fig. 4).…”

Section: Effects Of Elevated [Co 2 ] On the Expression Of Genes Involmentioning

confidence: 89%

“…For example, it was reported [4] that 69% of the N measured in the spike was remobilised from vegetative parts under low rainfall conditions in Western Australia. Hence, senescence processes are investigated in crop improvement programs with the aim to increase yields and nutrient use efficiency [1,6]. Manipulation of senescence processes has good potential as a target for crop improvement: For example, delayed senescence in 'stay green' varieties can prolong the period of active photosynthesis and enhance yield and nutrient use efficiency [1].…”

Section: Introductionmentioning

confidence: 99%

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Expression patterns of C- and N-metabolism related genes in wheat are changed during senescence under elevated CO2 in dry-land agriculture

et al. 2015

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Section: Effects Of Elevated [Co 2 ] On the Expression Of Genes Involmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Expression patterns of C- and N-metabolism related genes in wheat are changed during senescence under elevated CO2 in dry-land agriculture

et al. 2015

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“…It has been suggested that the development of genotypes with appropriate root traits might increase crop yields on infertile soils (Lynch, 2007, 2011; Hawkesford, 2011), and modern cultivars that were bred for the conventional high-input sector with selection in conventional breeding programmes lack important traits required under low-input and organic production conditions (Van Bueren et al, 2002; Murphy et al, 2007; Wolfe et al, 2008). According to Parr et al (1990), low input farming systems “seek to optimize the management and use of internal production inputs, and minimize the use of external production inputs.”, and organic farming generally adheres to this principle.…”

Section: Introductionmentioning

confidence: 99%

Vigorous Root Growth Is a Better Indicator of Early Nutrient Uptake than Root Hair Traits in Spring Wheat Grown under Low Fertility

et al. 2016

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A number of root and root hair traits have been proposed as important for nutrient acquisition. However, there is still a need for knowledge on which traits are most important in determining macro- and micronutrient uptake at low soil fertility. This study investigated the variations in root growth vigor and root hair length (RHL) and density (RHD) among spring wheat genotypes and their relationship to nutrient concentrations and uptake during early growth. Six spring wheat genotypes were grown in a soil with low nutrient availability. The root and root hair traits as well as the concentration and content of macro- and micronutrients were identified. A significant genetic variability in root and root hair traits as well as nutrient uptake was found. Fast and early root proliferation and long and dense root hairs enhanced uptake of macro- and micronutrients under low soil nutrient availability. Vigorous root growth, however, was a better indicator of early nutrient acquisition than RHL and RHD. Vigorous root growth and long and dense root hairs ensured efficient acquisition of macro- and micronutrients during early growth and a high root length to shoot dry matter ratio favored high macronutrient concentrations in the shoots, which is assumed to be important for later plant development.

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“…Batten (1992) discusses that there are economic reasons for seeking genotypes which achieve high yields of grain with a low concentration of P, removing less P from the soil. Increasing the nutrient use efficiency of crops has seldom been the main target of plant breeding focusing mainly on yield improvements (Hawkesford 2011). Meanwhile, it has been demonstrated for many plant species that under P limiting conditions root and shoot responses are genetically variable (Vance 2011).…”

Section: Variability Between Cultivars and Genotypesmentioning

confidence: 99%

Variability of P Uptake by Plants

Panten

Godlinski

Schroetter

et al. 2016

Phosphorus in Agriculture: 100 % Zero

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Phosphorus (P) uptake affects the planning of P fertilisation of agricultural crops and subsequently the economic evaluation of farming practices and the quantification of agri-environmental burdens. The P uptake of plants is influenced by soil type, soil available P, availability of other essential nutrients, climate and weather conditions as well as by the nutrient use efficiency of the grown cultivar. Phosphorus coefficients are mainly derived from P fertiliser experiments, reflecting regional soil and weather conditions as well as farming practice. P coefficients commonly used for a single crop can vary substantially and hence rarely reflect the actual P uptake rates of crops. However, the main driving factor in P budgets is the yield level rather than the P concentration in plants. While it is difficult to determine a 'correct' P coefficient for all crops from which to calculate reliable agri-environmental indicators, it is important for farmers to be able to calculate their nutrient budgets as accurately as possible to avoid economic losses and environmental burdens.

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An Overview of Nutrient Use Efficiency and Strategies for Crop Improvement

Cited by 40 publications

References 60 publications

Expression patterns of C- and N-metabolism related genes in wheat are changed during senescence under elevated CO2 in dry-land agriculture

Expression patterns of C- and N-metabolism related genes in wheat are changed during senescence under elevated CO2 in dry-land agriculture

Vigorous Root Growth Is a Better Indicator of Early Nutrient Uptake than Root Hair Traits in Spring Wheat Grown under Low Fertility

Variability of P Uptake by Plants

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