关键词: Glu-1位点; 缺失; 麦谷蛋白聚合体; 面团特性 Effects of Glu-1Deletion on Size Distribution of Glutenin Polymeric Protein and Dough Properties in Common Wheat ZHANG Ping-Ping1,*, MA Hong-Xiang1, YAO Jin-Bao1, Joseph M. AWIKA2 1Provincial Key Laboratory for Agrobiology / Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
2Cereal Quality Laboratory, Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843, USA
AbstractThe relationship between the HMW-GS and LMW-GS components and the size distribution of glutenin polymeric protein and dough properties were studied using Glu-1 normal and deletion lines, which provides a foundation for investigating the potential of Glu-1 deletion line in quality improvement of wheat. In the 20 hard white winter wheat lines tested, one was Glu-A1deletion line, five were Glu-D1deletion lines, and three were Glu-A1 and Glu-D1double-deletion lines. Flour protein contents of the lines tested ranged from 13.39% to 14.12% with no significant difference between each other and between deletion and non-deletion groups. In Glu-1deletion lines, the high molecular weight glutenin subunits/low molecular weight glutenin subunits ratio (HMW/LMW), content of SDS unextractable polymeric protein (UPP), and percentage of UPP (%UPP) were significantly lower than those in non-deletion lines. However, the glutenin/gliadin ratio (GLU/GLI) was similar in all genotypes, with no significant difference between deletion and non-deletion groups. Deletion at Glu-1 resulted in a significant decrease of dough elasticity and a significant increase of dough extensibility. Several Glu-1 deletion lines were characterized with medium gluten strength and excellent extensibility, suggesting that the size distribution of glutenin polymeric protein and dough properties were affected by both allelic composition and quantity of glutenin subunits. These results indicate that Glu-1 deletion lines can be used to improve dough extensibility and processing quality of common wheat.
Keyword:Glu-1 locus; Deletion; Glutenin polymeric protein; Dough properties Show Figures Show Figures
表2 高分子量麦谷蛋白亚基缺失对蛋白质含量和谷蛋白大聚体粒度分布的影响 Table 2 Effects of HMW-GS deletion on protein content and the size distribution of polymeric protein
品系 Line
蛋白含量 FPC
谷蛋白/醇溶蛋白 含量比 GLU/GLI
高低分子量谷蛋白 亚基含量比 HMW/LMW
可溶性谷蛋白 大聚体含量 EPP (× 104 AU)
不溶性谷蛋白 大聚体含量 UPP (× 104 AU)
不溶性谷蛋白 大聚体百分比 %UPP
非缺失系 Non-deletion line
L1
13.74
0.58
0.37
6.78
5.51
44.80
L2
13.71
0.64
0.40
7.12
6.13
46.31
L3
13.45
0.67
0.39
6.27
6.62
51.16
L4
13.39
0.65
0.35
6.79
6.11
47.35
L5
13.67
0.50
0.56
7.17
4.31
38.56
L6
13.76
0.69
0.56
7.05
4.46
48.23
L7
13.42
0.75
0.48
6.92
6.45
46.90
L8
13.70
0.76
0.32
7.10
4.85
33.32
L9
13.64
0.69
0.32
6.98
6.22
37.91
L11
13.54
0.62
0.34
7.93
4.89
44.54
L14
13.36
0.68
0.33
7.36
4.50
36.30
缺失系 Deletion line
L10
13.99
0.60
0.22
8.80
4.42
29.95
L12
14.12
0.61
0.22
7.86
3.41
26.96
L13
13.58
0.52
0.24
6.46
5.25
26.44
L15
13.59
0.64
0.27
7.90
2.93
29.25
L16
13.59
0.56
0.24
7.05
2.56
26.27
L17
13.85
0.61
0.29
7.40
4.21
37.15
L18
13.50
0.64
0.33
7.83
3.21
40.11
L19
13.42
0.68
0.33
8.35
3.70
37.68
L20
13.72
0.61
0.27
7.74
2.80
30.51
LSD0.05
0.732
0.087
0.028
0.942
0.848
4.037
Data are averages from two environments. FPC: flour protein content; GLU/GLI: ratio of glutenin to gliadin; HMW/LMW: ratio of HMW-GS to LMW-GS; EPP: SDS-extractable polymeric protein in the flour; UPP: SDS-unextractable polymeric protein in the flour; %UPP: percent UPP in polymeric protein. 数据为2个环境的平均值。FPC: 蛋白含量; GLU/GLI: 谷蛋白/醇溶蛋白含量比; HMW/LMW: 高低分子量谷蛋白亚基含量比; EPP: 可溶性谷蛋白大聚体含量; UPP: 不溶性谷蛋白大聚体含量; %UPP: 不溶性谷蛋白大聚体百分比。
表2 高分子量麦谷蛋白亚基缺失对蛋白质含量和谷蛋白大聚体粒度分布的影响 Table 2 Effects of HMW-GS deletion on protein content and the size distribution of polymeric protein
表4 蛋白质含量及贮藏蛋白特性参数与籽粒硬度和面团特性的相关系数 Table 4 Correlation coefficients between flour protein content, gluten protein parameters and dough properties
面团特性 Dough properties
蛋白含量 FPC
谷蛋白/醇溶 蛋白含量比 GLU/GLI
高低分子量谷 蛋白亚基含量比 HMW/LMW
可溶性谷蛋白 大聚体含量 EPP
不溶性谷蛋白 大聚体含量 UPP
不溶性谷蛋白 大聚体百分比 %UPP
揉面仪峰值时间 Mixograph peak time
-0.35
0.38
0.73* *
-0.46*
0.68* *
0.95* *
拉伸最大抗阻 Resistance to extension
-0.29
0.35
0.76* *
-0.46*
0.59* *
0.92*
拉伸延展性 Extensibility
0.46*
-0.05
-0.80* *
0.58* *
-0.56* *
-0.82* *
* and * * indicate significance at the 0.05 and 0.01 probability levels, respectively. FPC: flour protein content; GLU/GLI: ratio of glutenin to gliadin; HMW/LMW: ratio of HMW-GS to LMW-GS; EPP: SDS-extractable polymeric protein in the flour; UPP: SDS-unextractable polymeric protein in the flour; %UPP: percent UPP in polymeric protein. * 和* * 分别表示在0.05和0.01概率水平下显著。
表4 蛋白质含量及贮藏蛋白特性参数与籽粒硬度和面团特性的相关系数 Table 4 Correlation coefficients between flour protein content, gluten protein parameters and dough properties
4 结论无论Glu-1位点缺失与否, 参试品系具有相似的蛋白质含量, 谷蛋白聚合体粒度分布和面筋质量受谷蛋白亚基组成和表达量的影响。HMW-GS缺失显著降低UPP、%UPP和HMW/LMW值及面团弹性, 但提高面团延展性。HMW-GS缺失可能是改善面团延展性、提高食品加工品质的方法之一。 The authors have declared that no competing interests exist.
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