Effect of N supply on the carbon economy of barley when accounting for plant size

Negrini, Ana Clarissa Alves; Evans, John R.; Kaiser, Brent N.; Millar, A. Harvey; Kariyawasam, Buddhima C; Atkin, Owen K.

doi:10.1071/fp19025

Cited by 6 publications

(3 citation statements)

References 67 publications

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“…The nutritional growth of plants is influenced by many intrinsic and extrinsic factors, and productivity can be effectively increased by changing some of them [35,36]. Numerous studies have demonstrated that exogenous N addition is one of the most effective ways to increase productivity [37,38], and the results of this work were consistent with the fact that N addition to the nutrient solution increased the growth of pecan to varying degrees compared to the N deficiency treatment (Figure 1B,D).…”

Section: Comprehensive Evaluation Of Photosynthesis and Growth Of Pecansupporting

confidence: 84%

Ammonia–Nitrate Mixture Dominated by NH4+–N Promoted Growth, Photosynthesis and Nutrient Accumulation in Pecan (Carya illinoinensis)

Chen

Zhu

Tan

et al. 2021

Forests

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Although ammonia–nitrogen (NH4+–N) and nitrate–nitrogen (NO3−–N) are the two main forms of N absorbed and utilized by plants, the preferences of plants for these forms are still unclear. In this study, we analyzed the growth, photosynthesis, and nutrients of pecan under different NH4+:NO3− ratios (0/0, 0/100, 25/75, 50/50, 75/25, 100/0) by indoor aerosol incubation. The results showed that additions of different N forms promoted the growth and development of pecan seedlings. When NO3−–N was used as the sole N source, it significantly promoted the ground diameter growth of pecan and increased the leaf pigment content and photosynthetic rate. The NH4+:NO3− ratio of 75:25 and NH4+–N as the sole N source significantly increased the soluble sugars in stems and roots, starch in leaves, stems and roots, soluble protein in leaves and stems, and soluble phenols in stems and roots. Additionally, the NH4+:NO3− ratio of 75:25 increased plant height, leaf number, root soluble protein, and leaf soluble phenol contents. In conclusion, regarding the physiological aspects of pecan growth, pecans are more inclined to use NH4+–N. Considering that the NH4+–N as the only N source may lead to nutrient imbalance or even toxicity, the NH4+:NO3− ratio of 75:25 was most favorable for the growth and development of pecan seedlings.

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Section: Comprehensive Evaluation Of Photosynthesis and Growth Of Pecansupporting

confidence: 84%

Ammonia–Nitrate Mixture Dominated by NH4+–N Promoted Growth, Photosynthesis and Nutrient Accumulation in Pecan (Carya illinoinensis)

Chen

Zhu

Tan

et al. 2021

Forests

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“…The application of N fertilizer is an important way to improve the productivity of cash crops ( Negrini et al., 2020 ). However, the effect of different forms of N fertilizer on plant growth is different ( Nicodemus et al., 2008 ; Lang et al., 2018 ; Qin et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Ammonium-nitrate mixtures dominated by NH4+-N promote the growth of pecan (Carya illinoinensis) through enhanced N uptake and assimilation

et al. 2023

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Nitrogen (N) limits plant productivity, and its uptake and assimilation may be regulated by N sources, N assimilating enzymes, and N assimilation genes. Mastering the regulatory mechanisms of N uptake and assimilation is a key way to improve plant nitrogen use efficiency (NUE). However, it is poorly known how these factors interact to influence the growth process of pecans. In this study, the growth, nutrient uptake and N assimilation characteristics of pecan were analyzed by aeroponic cultivation at varying NH4 +/NO3 − ratios (0/0, 0/100,25/75, 50/50, 75/25,100/0 as CK, T1, T2, T3, T4, and T5). The results showed that T4 and T5 treatments optimally promoted the growth, nutrient uptake and N assimilating enzyme activities of pecan, which significantly increased aboveground biomass, average relative growth rate (RGR), root area, root activity, free amino acid (FAA) and total organic carbon (TOC) concentrations, nitrate reductase (NR), nitrite reductase (NiR), glutamine synthetase (GS), glutamate synthase (Fd-GOGAT and NADH-GOGAT), and glutamate dehydrogenase (GDH) activities. According to the qRT-PCR results, most of the N assimilation genes were expressed at higher levels in leaves and were mainly significantly up-regulated under T1 and T4 treatments. Correlation analysis showed that a correlation between N assimilating enzymes and N assimilating genes did not necessarily exist. The results of partial least squares path model (PLS-PM) analysis indicated that N assimilation genes could affect the growth of pecan by regulating N assimilation enzymes and nutrients. In summary, we suggested that the NH4 +/NO3 − ratio of 75:25 was more beneficial to improve the growth and NUE of pecan. Meanwhile, we believe that the determination of plant N assimilation capacity should be the result of a comprehensive analysis of N concentration, N assimilation enzymes and related genes.

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“…Therefore empirical evidence conflicts on whether root:shoot ratios should increase or decrease from changes in CO 2 and soil nitrogen availability. An emergent property of the model is the decline in root:shoot ratio with age and is seen commonly in plants (Poorter et al, 1988;Negrini et al, 2020). Another emergent property of the model is that low N availability produces small plants with reasonable intermediate concentrations of carbon and nitrogen (Wu et al, 2007) rather than the alternative of producing larger plants with a diluted nitrogen content and consequences of functioning (Vos et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Implementing a framework of carbon and nitrogen feedback responses into a plant resource allocation model

Holland

Monk

Clayton

et al. 2023

Preprint

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The allocation of resources to roots and shoots can greatly alter total plant mass. Allocation is thought to be the consequence of growth processes (i.e uptake rates, transport rates, growth rates) and the communication between them via signalling mechanisms. Feedbacks that alter growth processes are induced in nature by changes in the internal pools of carbon and nitrogen, but how these function together to define allocation remains unclear. We introduce a framework model of internal feedback responses to changes in plant carbon and nitrogen concentrations. We evaluate how well the model responds to changes in carbon and nitrogen availability by simulating external environmental perturbations that influence the uptake of resources. The model reflects experimental results when looking at the effect of atmospheric CO2 and soil nitrogen concentrations on total plant mass and replicates observed responses to leaf defoliation events. Overall this shows that a combination of known signalling mechanisms are sufficient to reproduce experimentally observed responses to external resource availability. Model simulations highlight key areas of uncertainty where more empirical data is needed. In particular, quantitative data is needed to establish the strengths and rates at which feedback responses to carbon and nitrogen substrate concentrations alter growth and uptake rates.

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Effect of N supply on the carbon economy of barley when accounting for plant size

Cited by 6 publications

References 67 publications

Ammonia–Nitrate Mixture Dominated by NH4+–N Promoted Growth, Photosynthesis and Nutrient Accumulation in Pecan (Carya illinoinensis)

Ammonia–Nitrate Mixture Dominated by NH4+–N Promoted Growth, Photosynthesis and Nutrient Accumulation in Pecan (Carya illinoinensis)

Ammonium-nitrate mixtures dominated by NH4+-N promote the growth of pecan (Carya illinoinensis) through enhanced N uptake and assimilation

Implementing a framework of carbon and nitrogen feedback responses into a plant resource allocation model

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