Shoot biomass in wheat is the driver for nitrogen uptake under low nitrogen supply, but not under high nitrogen supply

Kamiji, Yoshiaki; Pang, Jiayin; Milroy, S.P.; Palta, Jairo A.

doi:10.1016/j.fcr.2014.04.009

Cited by 35 publications

(16 citation statements)

References 24 publications

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“…24 also found that deep root growth in wheat was correlated with water uptake, while Kamiji et al . 25 revealed that the correlation between wheat shoot N content and root biomass was siginificant under low N supply. Root growth and development is therefore affected by the complex belowground environment, and thus, further efforts are required to fully understand the role of the root system in terms of yield.…”

Section: Discussionmentioning

confidence: 99%

Root and nitrate-N distribution and optimization of N input in winter wheat

Guo

Wang

et al. 2019

Sci Rep

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Scientific management of nitrogen (N) fertilizer has a significant effect on yield while also reducing the environmental risks. In this study, we conducted field experiments over three years at two different sites (Zhengzhou and Shangshui) in Henan Province, China, using different N application rates (0, 90,180, 270, and 360 kg ha−1) to determine the relationships between soil N supply and N demand in winter wheat (Triticum aestivum L.). Optimal N input was then determined. Both sites showed the same trend. Namely, aboveground N uptake and soil nitrate N (NO3−-N) increased with increasing N, while NO3−-N decreased with increasing soil depth, gradually moving downwards with growth. A significant correlation (p < 0.001) between increasing aboveground N uptake and increasing NO3−-N was also observed under N application, with the best relationships occurring in the 20–60 cm layer during jointing-anthesis (R2 = 0.402–0.431) and the 20–80 cm layer at maturity (R2 = 0.474). Root weight density showed the same spatial-temporal characteristics as NO3−-N, following a unimodal trend with increasing N, and peaking at 90 kg ha−1. The root weight density was mainly distributed in the 0–60 cm layer (above 80%), with the 20–60 cm layer accounting for 30% of the total root system. In this layer, the root weight density was also significantly positively correlated with aboveground N uptake. Wheat yield reached saturation under high N (>270 kg ha−1), with a sharp decrease in N use efficiency (NUE) and linear increase in residual NO3−-N. To balance yield and the risk of environmental pollution in the experimental area, an N application rate of 180–270 kg ha−1 is recommended under sufficient irrigation, thereby supporting a well-developed root system while ensuring balance between N supply and demand.

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Section: Discussionmentioning

confidence: 99%

Root and nitrate-N distribution and optimization of N input in winter wheat

Guo

Wang

et al. 2019

Sci Rep

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“…Greater seedling vigour in root and shoot growth affects N uptake in wheat , and rooting depth of winter wheat genotypes is important for the uptake of nitrogen during stem elongation and grain filling (Ytting et al, 2014). Under limited supply of available nitrogen in early developmental phases, as common in organic farming, early shoot growth will result in higher photosynthesis, resulting in more assimilates being translocated to the roots Kamiji et al, 2014). Nutrient availability is often poorer under organic conditions and nutrient mineralization from organic sources tends to be slow in spring as higher temperatures are required to begin this process compared to the direct uptake soluble mineral fertilizer (Messmer et al, 2012;Finckh and van Bruggen, 2015).…”

Section: Discussionmentioning

confidence: 99%

Evolutionary changes of weed competitive traits in winter wheat composite cross populations in organic and conventional farming systems

Bertholdsson

Weedon

Brumlop

et al. 2016

European Journal of Agronomy

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a b s t r a c tSeedling root and shoot growth in hydroponics and allelopathic activity using a bioassay have been studied in very diverse populations of winter wheat grown under either organic or conventional conditions for a number of generations and subjected only to natural selection. The study was conducted on seeds from generation 6 (F 6 ) and 11 (F 11 ) from three composite cross populations (CCPs) produced by the Organic Research Centre in the UK. Since the F 5 the populations were maintained under organic and conventional conditions in Germany. Two parallel populations were created from each CC, resulting in a total of six organic and six conventional CCPs. The sets of parallel populations showed similar evolutionary trends indicating that the observed changes are related to differences in management rather than chance. Seedling root length and seedling root and shoot weight in the F 11 of the organically-managed CCPs were significantly greater than in the organic F 6 CCPs. In the conventionally-managed CCPs no such differences were observed. Both organic and conventional CCPs produced for quality showed higher early root and shoot growth than those produced for yield pointing to genetic differences among population types and highlighting the importance of early vigour for NUE. There were no significant differences in the allelopathic activity of the populations and between generations. The Shannon-Weaver diversity indices were similar for the studied traits in organic and conventional CCPs and hence no major changes in diversity had occurred between F 6 to F 11 . As changes in plant height were small and weed pressure in the fields low it is concluded that the observed differences are more related to NUE, rather than intra-specific competition for light or the direct effect of increased weed pressure in the organic system.

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“…The agronomic nitrogen‐use efficiency (ANUE) of wheat comprises both uptake efficiency and utilization efficiency, and the process of uptake is the foundation on which the total agronomic efficiency is built (Dhugga and Waines , Kamiji et al. ). Here, under post‐anthesis drought and/or heat stress, the primed plants had a significantly higher ANUE as compared with the non‐primed plants.…”

Section: Discussionmentioning

confidence: 99%

Drought Priming at Vegetative Growth Stage Enhances Nitrogen‐Use Efficiency Under Post‐Anthesis Drought and Heat Stress in Wheat

Liu

Larsen

et al. 2016

J Agronomy Crop Science

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To study the effects of early drought priming at 5th‐leaf stage on grain yield and nitrogen‐use efficiency in wheat (Triticum aestivum L.) under post‐anthesis drought and heat stress, wheat plants were first exposed to moderate drought stress (drought priming; that is, the leaf water potential reached ca. −0.9 MPa) at the 5th‐leaf stage for 11 days, and leaf water relations and gas exchange rates, grain yield and yield components, and agronomic nitrogen‐use efficiency (ANUE) of the primed and non‐primed plants under post‐anthesis drought and heat stress were investigated. Compared with the non‐primed plants, the drought‐primed plants possessed higher leaf water potential and chlorophyll content, and consequently a higher photosynthetic rate during post‐anthesis drought and heat stress. Drought priming also resulted in higher grain yield and ANUE in wheat under post‐anthesis drought and heat stress. Drought priming at vegetative stage improves carbon assimilation and ANUE under post‐anthesis drought and heat stress and their combination in wheat, which might be used as a field management tool to enhance stress tolerance of wheat crops to multiple abiotic stresses in a future drier and warmer climate.

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Shoot biomass in wheat is the driver for nitrogen uptake under low nitrogen supply, but not under high nitrogen supply

Cited by 35 publications

References 24 publications

Root and nitrate-N distribution and optimization of N input in winter wheat

Root and nitrate-N distribution and optimization of N input in winter wheat

Evolutionary changes of weed competitive traits in winter wheat composite cross populations in organic and conventional farming systems

Drought Priming at Vegetative Growth Stage Enhances Nitrogen‐Use Efficiency Under Post‐Anthesis Drought and Heat Stress in Wheat

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