Effects of nitrogen fertilizer on protein synthesis, accumulation, and physicochemical properties in common buckwheat
0301 basic medicine
Common buckwheat
03 medical and health sciences
S
Agriculture (General)
Grain quality
Storage protein
Agriculture
Nitrogen metabolism
Nitrogen fertilizer
S1-972
DOI:
10.1016/j.cj.2023.01.002
Publication Date:
2023-02-02T11:29:47Z
AUTHORS (7)
ABSTRACT
Nitrogen (N) fertilization affects grain quality in common buckwheat (Fagopyrum esculentum Moench). But the effects of N fertilizer on various buckwheat protein parameters are not fully understood. This study aimed to investigate the synthesis, accumulation, and quality of buckwheat protein under four N application rates in the Loess Plateau, China. Optimal N application (180 kg N ha−1) improved yield, agronomic traits, and N transport and increased protein yield and protein component accumulation. Prolamin and glutelin accumulation first increased and then decreased with increasing N application. The relationships between the contents of protein components and the amount of applied N generally followed quadratic functions. Nitrate reductase and glutamine synthetase activities first increased and then decreased with increasing N levels. Optimal N fertilizer increased the waterholding capacity and thermal stability of buckwheat protein and reduced its emulsification capacity, but negligibly changed its oil-absorption capacity. Hydrophobic amino acids and glutelin content were the main factors affecting protein quality.
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