Dynamic Resistant Starch Accumulation in Contrasting Wheat Genotypes Highlights the Lipid Metabolic Pathway Related to Resistant Starch Synthesis
Hong-Pan Wang,
Hai-Ya Cai,
Jing-Huan Zhu,
Xia Wei,
Shuo Zhang,
Gang Liu,
Yong-Gang He,
Bo Li,
Le Xu,
Chun-Hai Jiao,
Wei Hua,
Yan-Hao Xu
Affiliations
Hong-Pan Wang
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
Hai-Ya Cai
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
Jing-Huan Zhu
Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Xia Wei
Hubei Key Laboratory of Waterlogging Disaster and Agriculture Use of Wetland/Hubei Collaborative Innovation Centre for Grain Industry, Yangtze University, Jingzhou 434025, China
Shuo Zhang
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
Gang Liu
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
Yong-Gang He
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
Bo Li
Hubei Key Laboratory of Waterlogging Disaster and Agriculture Use of Wetland/Hubei Collaborative Innovation Centre for Grain Industry, Yangtze University, Jingzhou 434025, China
Le Xu
Hubei Key Laboratory of Waterlogging Disaster and Agriculture Use of Wetland/Hubei Collaborative Innovation Centre for Grain Industry, Yangtze University, Jingzhou 434025, China
Chun-Hai Jiao
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
Wei Hua
Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Yan-Hao Xu
Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement, Food Crops Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
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.
