Abstract:

【Objective】 In order to improve nutrient quality of wheat ( Triticum aestivum L.), the glutenin fraction content and glutenin macropolymer (GMP) changes of wheat grain were investigated after spraying ABA, as glutenin fraction content and glutenin macropolymer (GMP) play key roles in grain quality of wheat. 【Method】 The changes of glutenin fraction content and GMP size distribution were analyzed and the effects of ABA treatments on the glutenin fraction content and GMP size distribution in grains of two wheat cultivars, Shannong 8355 and Shannong 15, which had high grain yields in fields, were evaluated. 【Result】 The results showed that the protein content and glutenin content of wheat grain were improved after spraying ABA(12 mg&#8226;kg-1, 45 mL&#8226;m-2)at late booting stage and grain formation stage, the contents of HMW or LMW-insoluble glutenin in both of the two cultivars were also increased at the same time and reached a significant level when compared with the CK, but spraying ABA at the late booting stage, the grain soluble glutenin content was less affected. The GMP content and yield were increased and the particle size distribution of GMP were changed by spraying ABA, but the performance was different in different cultivars and treatments. Correlation analysis showed that HMW-insoluble glutenin content, LMW-insoluble glutenin content, GMP content and GMP/Pr. had a negative correlation with small particle size (d <15 um) distribution of GMP. 【Conclusion】 ABA could regulate the glutenin fraction content and glutenin macropolymer (GMP) size distribution and improve nutrient quality of wheat.

Key words: ABA')">ABA, wheat, glutenin, GMP, size distribution