Journal of Food, Agriculture and Environment

HMW-GS accumulation and GMP particles size distribution in wheat grain in relation to nitrogen rate 

Author(s):

Wenyang Li, Suhui Yan *, Xiaqing Shi, Congyu Zhang, Qingqin Shao

Recieved Date: 2013-01-21, Accepted Date: 2013-04-24

Abstract:

High molecular weight glutenin subunits (HMW-GS) content and glutenin macropolymer (GMP) particle size distribution affect grain quality fatally in wheat. The present study was carried out to evaluate the effect of nitrogen rate on HMW-GS accumulation and GMP particle size distribution in wheat grain. The results showed that the diameter of GMP particles changed in the range of 0.375~200 µm. Volume distribution of GMP particles show the typical bimodal distribution with peak values in the ranges of 4~4.9 µm and 87.9~105.9 µm, respectively. A typical population of number distribution of GMP particles with peak values range from 0.9 to 1 µm. Most particles in the wheat grain were smaller particles. Nitrogen application could increase the percentages of volume of GMP particles and >100 µm within the nitrogen rates from 0 to 240 kg ha^-1, which indicates that nitrogen application (240 kg ha^-1) was conducive to the formation of larger GMP particles. However, excessive nitrogen of 360 kg hm^-2 went against the formation of large particles. The appropriate nitrogen fertilizer could improve the total HMW-GS accumulation, but too much was unfavorable. The appropriate nitrogen rate especially could improve the contents of HMW-GS (Dx5+Dy10) coded by Glu-D locus. Remarkable negative correlation was found between the content of HMW-GS and volume percentage of GMP particles of 12-100 µm. However, there was a significant positive correlation between the content of HMW-GS and volume percentage of particles >100 µm. The D(4, 3) increased with decreasing GMP particles >100 µm. The results suggested that larger GMP particles had more HMW-GS content. 

Keywords:

Wheat (Triticum aestivum L.), high molecular weight glutenin subunits (HMW-GS), glutenin macropolymer (GMP), nitrogen

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Agriculture
Pages: 773-776

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