Genotypic variation in the uptake, partitioning and remobilisation of nitrogen during grain-filling in wheat

Abstract

HighlightsTwenty elite varieties of wheat grown at 2 N-rates in a field experiment at Rothamsted, UK.To quantify genetic variation in uptake, partitioning and remobilisation of N during grain-filling.Significant genetic variation in yield and %N, and in N-uptake, organ N-contents and N remobilised from straw to grain.N remobilised from vegetative organs with high levels of efficiency (80–85%).No strong correlations between N-related plant parameters (e.g. stem-N) and crop performance at a given N-rate.

Nitrogen use efficiency in modern wheat cultivars

“…It was observed a direct effect (DE) with sign and magnitude similar to the correlation coefficient (r) of the NRE over the NUE under low (DE = 0.94, r = 0.617) and high (DE = 0.65, r = 0.721) N supply, corroborating the studies of Barraclough et al (2014), Guo et al (2014) and Le Gouis et al (2000). Although NUtE has been associated with the NUE (r = 0.487 and r = 0.516), this was mainly due to indirect effects (IE) of NRE (IE = 0.587) under low N supply.…”

“…The highest protein concentrations in the grain are related to the higher remobilization of post-anthesis N (Barraclough et al 2014;Bogard et al 2010). According to Kichey et al (2007), much of the N found in grains comes from the remobilization of N stored in the shoots and roots of the plant before anthesis.…”

“…Management practices to help farmers increase productivity and reduce production costs should be studied to ensure agricultural sustainability (Kaneko et al 2010). In this sense, studies indicate that the development and use of wheat cultivars with higher NUE can contribute to reduce the applied N amounts without decreasing GY (Barraclough et al 2014;Gaju et al 2014).…”

Nutritional Quality of Triticale (×Triticosecale Wittm.) Grown under Different Cropping Systems

“…Similar protein content in triticale varieties has been previously reported: Tohver et al (2005) reported 9.7-14.5 g·100 g -1 depending on genotype grown in Northern conditions, Rakha et al (2011) observed 11.7-15.7 g·100 g -1 depending on cultivar and growing site; and Fraú et al (2016) reported 11.8-15.2% depending on cultivar (Fraú et al, 2016). The observed inverse relationship between grain yield and protein content in our study was previously reported by several researchers (Martre et al, 2003;Barraclough et al, 2014).…”

Influence of Nitrogen Fertilizer Application on Grain Yield, Nitrogen Uptake Efficiency, and Nitrogen Use Efficiency of Bread Wheat (Triticum aestivum L.) Cultivars in Eastern Ethiopia

“…Gaju et al (2011) also reported genetic variability in NUE under low N application rate due largely to differences in NUtE rather than NUpE. Studies indicate that the development and use of wheat cultivars with higher NUE can contribute to a reducing the amount of nitrogen to be applied without decreasing grain yield (Barraclough et al, 2014;Gaju et al, 2014). Therefore, understanding the physiological basis of variations among wheat cultivars in NUtE may offer avenues to increase NUE for enhancing whaet yield in Ethiopia.…”