Dynamic Resistant Starch Accumulation in Contrasting Wheat Genotypes Highlights the Lipid Metabolic Pathway Related to Resistant Starch Synthesis

Resistant starch (RS) shows several health benefits. Enhancing the RS content of wheat is of major commercial importance. However, knowledge regarding the RS synthesis mechanism in wheat remains limited. In this study, the dynamic accumulation of RS during the filling process in two wheat (Triticum...

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Published in:Agriculture (Basel) 2022-02, Vol.12 (2), p.308
Main Authors: Wang, Hong-Pan, Cai, Hai-Ya, Zhu, Jing-Huan, Wei, Xia, Zhang, Shuo, Liu, Gang, He, Yong-Gang, Li, Bo, Xu, Le, Jiao, Chun-Hai, Hua, Wei, Xu, Yan-Hao
Format: Article
Language:English
Subjects:
Accumulation
Barley
Biosynthesis
Cultivars
Gene expression
Genes
Genomes
Genotypes
Grain
Lipid metabolism
lipid metabolism pathway
Lipids
Metabolic pathways
Network analysis
Pollination
resistant starch
secondary accumulation
Starch
Synthesis
transcriptome
Transcriptomes
Triticum aestivum
Wheat
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Summary:Resistant starch (RS) shows several health benefits. Enhancing the RS content of wheat is of major commercial importance. However, knowledge regarding the RS synthesis mechanism in wheat remains limited. In this study, the dynamic accumulation of RS during the filling process in two wheat (Triticum aestivum L.) genotypes with contrasting RS contents (H242, high RS content; H189, low RS content) were investigated. The results demonstrate that beyond 25 days after pollination (DAP), the RS content of H189 was relatively stable, but that of H242 continued to increase. Secondary accumulation was observed in the high-RS-content wheat genotype. A comparative transcriptome analysis between H242 and H189 at 20 DAP and 35 DAP showed that the differentially expressed genes were mainly involved in glycerolipid metabolism, glycerophospholipid metabolism and glucuronate interconversions. Furthermore, weighted gene coexpression network analysis suggested that lipid metabolic pathways such as the glycerophospholipid metabolism pathway might be involved in RS synthesis, and lipid-related genes upregulated beyond 25 DAP resulted in RS secondary accumulation. This work provides insight into the characteristics and mechanisms of RS synthesis.
ISSN:2077-0472
2077-0472
DOI:10.3390/agriculture12020308