Effects of elevated nitrogen fertilizer on the multi-level structure and thermal properties of rice starch granules and their relationship with chalkiness traits
文献类型： 外文期刊
作者： Guo, Changchun 1 ; Wuza, Riqu 1 ; Tao, Ziling 1 ; Yuan, Xiaojuan 1 ; Luo, Yinghan 1 ; Li, Feijie 1 ; Yang, Guotao 3 ; Chen, Zongkui 1 ; Yang, Zhiyuan 1 ; Sun, Yongjian 1 ; Ma, Jun 1 ;
作者机构： 1.Sichuan Agr Univ, Rice Res Inst, Crop Ecophysiol & Cultivat Key Lab Sichuan Prov, Chengdu, Peoples R China
2.Sichuan Acad Agr Sci, Rice & Sorghum Res Inst, Key Lab Southwest Rice Biol & Genet Breeding, Minist Agr & Rural Affairs, Deyang, Peoples R China
3.Southwest Univ Sci & Technol, Sch Life Sci & Engn, Mianyang, Peoples R China
4.Sichuan Agr Univ, Rice Res Inst, Crop Ecophysiol & Cultivat Key Lab Sichuan Prov, Chengdu 611130, Peoples R China
关键词： nitrogen rate; chalkiness; amylopectin multi-level structure distribution; thermal property
期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：4.1； 五年影响因子：4.2 ）
ISSN： 0022-5142
年卷期： 2023 年
页码：
收录情况： SCI
摘要： BACKGROUNDChalkiness in rice reduces its market value and affects consumer acceptance. Research on the mechanism of chalkiness formation has focused primarily on the activity of key enzymes of carbon metabolism and starch accumulation. The relationship between the formation of chalkiness induced by N fertilizer and rice starch's multi-level structure and thermal properties still needs to be fully elucidated. RESULTSIn this study, the rates of chalky grains and degree of chalkiness decreased with the increase in N fertilizer dosage. This was attributed to an increased proportion of short chains, ordered structure carbon chains, small starch granules, and branched starches, and a higher degree of crystallinity and & UDelta;H-g in protein, and a decreased proportion of amylose, large starch granules, and weighted average diameter of starch granule surface area and volume. Application of N fertilizer promoted an increased proportion of short-branched chain amylopectin to develop a more ordered carbohydrate structure and crystalline lamella. These effects enhanced the normal development and compactness of starch granules in grains, and improved their arrangement morphology, thereby reducing the chalkiness in rice. CONCLUSIONThese changes in starch multi-level structure and protein improve the physicochemical characteristics of starch and enhance the fullness, crystallinity and compactness of starch granules, while synergistically increasing the regularity and homogeneity of starch granules and thus optimizing the stacking pattern of starch granules, leading to a reduction in rice chalkiness under nitrogen fertilization and thus improving the appearance of rice. & COPY; 2023 Society of Chemical Industry.
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