Ecological variation of wheat grain protein components and its relationships with N translocation

Abstract

Abstract: Wheat grain protein and protein components play a key role on grain-processing quality such as dough rheology and food cooking.The formations of protein components are in sequence and closely related to N accumulation and translocation after anthesis in wheat.Three wheat cultivars differing in grain protein contents grown at two different ecological sites were used to study the variations of protein and protein component contents.Significant genotype differences in protein and protein component contents were found among three wheat cultivars of the two eco-sites.There was a increase of crude protein content in wheat at Xuzhou signifiantly higher than that at Nanjing,which was resulted from the increase of albumin and glutenin contents.N accumulation and translocation after anthesis at Xuzhou were higher than that at Nanjing,while N assimilation after anthesis was higher at Nanjing than at Xuzhou.The contents of albumin,gliadinin and glutenin had soundly positive relationships with protein content and N translocation after anthesis.There were similar temporal shape of development rate after anthesis,but the highest rate appeared later at Nanjing than at Xuzhou.High development rate hampered the formation of albumin and glutenin in wheat at Nanjing,which led to a lower total grain protein in wheat at Nanjing than that at Xuzhou.

Key words: Transpiration, Agro-forestrial system, Affecting factors

CLC Number:

S512

JING Qi, DAI Tingbo, JIANG Dong, CAO Weixing. Ecological variation of wheat grain protein components and its relationships with N translocation[J]. cje, 2005, (7): 747-750.

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