Variation in concentrations of high-molecular-weight glutenin subunits and macropolymers in wheat grains of a recombinant inbred lines population and in two contrasting eco-sites in China.
BACKGROUND
Concentrations of high-molecular-weight glutenin subunits and macropolymers in wheat grains are important indicators of grain quality, which are genetically determined and affected by environmental factors. The 6 VS·6AL translocation chromosome segment is reported to own high powdery mildew and yellow rust resistance genes of Pm21 and Yr26. This study investigated the variation in concentrations of high-molecular-weight glutenin subunits (HMW-GS) and glutenin macropolymer (GMP) in response to the 6 VS·6AL translocation segment and the two contrasting sites.


RESULTS
Large variations in concentrations of HMW-GS and GMP were observed within lines containing different HMW-GS compositions and between the contrasting eco-sites. However, 6 VS·6AL chromosome translocation segment showed no significant effects on concentrations of HMW-GS and GMP. In addition, HMW-GS concentration was also found to be significantly correlated with the GMP concentration.


CONCLUSIONS
Concentrations of HMW-GS and GMP are largely affected by the eco-sites and the composition of HMW-GS, whilst not by the presence of 6 VS·6AL chromosome segment translocation. The 6 VS·6AL translocation is suggested as potential donor for breeding wheat cultivars for high resistence to powdery mildew and yellow rust with less risk of undesirable effects on grain quality.
Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture/Hi-Tech Key Laboratory of Information Agriculture of Jiangsu Province, Nanjing Agricultural University, P.R. China.
Xiangnan
X
Li
Jian
J
Cai
Fulai
F
Liu
Yun
Y
Bo
Zengjun
Z
Qi
Tingbo
T
Dai
Weixing
W
Cao
Dong
D
Jiang
D001947:Breeding; D002681:China; D032461:Chromosomes, Plant; D017753:Ecosystem; D002523:Edible Grain; D017343:Genes, Plant; D005983:Glutens / Q000235:genetics* / Q000378:metabolism; D008970:Molecular Weight; D011108:Polymers; D021122:Protein Subunits / Q000235:genetics* / Q000378:metabolism; D012639:Seeds / Q000378:metabolism; D014178:Translocation, Genetic; D014908:Triticum / Q000235:genetics* / Q000378:metabolism
D011108:Polymers; D021122:Protein Subunits; D005983:Glutens; C037302:glutenin