Residual nitrogen pools in mature winter wheat straw as affected by nitrogen application

Hecke, Jan van; Cour, Rasmus la; Jørgensen, Henning; Schjøerring, Jan K.

doi:10.1007/s11104-020-04600-6

Cited by 1 publication

(1 citation statement)

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“…The findings of previous studies have revealed that mild water deficits promote N availability and uptake ( Széles et al., 2012 ; Yan et al., 2020 ), whereas irrigation at the anthesis and grain-filling stages has been found to cause reductions in the N harvest index ( Moradi et al., 2022 ). GN is primarily determined by the N stored in the leaves at anthesis ( Zheng et al., 2020 ), and during the grain-filling stage, proteins deposited in the leaves are broken down into free amino acids that are remobilized to the grain via rachis ( Zhao et al., 2015 ; Hecke et al., 2020 ). In response to water deficit, the leaves of wheat plants at the late grain-filling stage undergo premature senescence, with concomitant rapid reductions in the concentration of leaf and rachis N. The process of leaf senescence, reductions in the sucrose and N concentration in leaves, and increases in GNC occur synchronously, and Gomez-Sanchez et al.…”

Section: Discussionmentioning

confidence: 99%

The end-use quality of wheat can be enhanced by optimal water management without incurring yield loss

Sheng

Wang

et al. 2022

Front. Plant Sci.

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In China, water-saving irrigation is playing important roles in ensuring food security, and improving wheat quality. A barrel experiment was conducted with three winter wheat (Triticum aestivum L.) genotypes and two irrigation pattens to examine the effects of regulated deficit irrigation (RDI) on wheat grain yield, water-use efficiency (WUE), and grain quality. In order to accurately control the soil water content, wheat was planted in the iron barrels set under a rainproof shelter, and the soil water content in the iron barrel was controlled by gravity method. The mechanisms whereby water management influences the end-use functional properties of wheat grain were also investigated. The results revealed that RDI improved the end-use functional properties of wheat and WUE, without significant yield loss (less than 3%). Moderate water deficit (60% to 65% field capacity) before jointing and during the late grain-filling stage combined with a slight water deficit (65% to 70% field capacity) from jointing to booting increased grain quality and WUE. The observed non-significant reduction in wheat yield associated with RDI may be attributed to higher rate of photosynthesis during the early stage of grain development and higher rate of transfer of carbohydrates from vegetative organs to grains during the later stage. By triggering an earlier rapid transfer of nitrogen deposited in vegetative organs, RDI enhances grain nitrogen content, which in turn could enhance dough elasticity, given the positive correlation between grain nitrogen content and dough midline peak value. Our results also indicate that the effects of RDI on grain quality are genotype dependent. Therefore, the grain end-use quality of some specific wheat genotypes may be enhanced without incurring yield loss by an optimal water management.

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