Effects of postponing nitrogen topdressing on starch structural properties of superior and inferior grains in hybrid indica rice cultivars with different taste values

文献类型： 外文期刊

第一作者： Yuan, Xiaojuan

作者： Yuan, Xiaojuan;Luo, Yongheng;Yang, Yonggang;Chen, Kairui;Wen, Yanfang;Luo, Yinghan;Li, Bo;Ma, Yangming;Guo, Changchun;Chen, Zongkui;Yang, Zhiyuan;Sun, Yongjian;Ma, Jun;Guo, Changchun;Sun, Yongjian

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关键词： indica rice; postponing nitrogen topdressing; starch structure; superior and inferior grains; eating quality

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2023 年 14 卷

页码：

收录情况： SCI

摘要： Introduction: Nitrogen (N) fertilizer management, especially postponing N topdressing can affect rice eating quality by regulating starch quality of superior and inferior grains, but the details are unclear. This study aimed to evaluate the effects of N topdressing on starch structure and properties of superior and inferior grains in hybrid indica rice with different tastes and to clarify the relationship between starch structure, properties, and taste quality.Methods: Two hybrid indica rice varieties, namely the low-taste Fyou 498 and high-taste Shuangyou 573, were used as experimental materials. Based on 150 kgN hm(-2), three N fertilizer treatments were established: zero N (N-0), local farmer practice (basal fertilizer: tillering fertilizer: panicle fertilizer=7:3:0) (N-1), postponing N topdressing (basal fertilizer: tillering fertilizer: panicle fertilizer=3:1:6) (N-2).Results: The starch granules of superior grains were more complete, and the decrease in small granules content and the stability of starch crystals were a certain extent less than those of inferior grains. Compared with N-1, under N-2, low-taste and high-taste varieties large starch granules content were significantly reduced by 6.89%, 0.74% in superior grains and 4.26%, 2.71% in inferior grains, the (B2 + B3) chains was significantly reduced by 1.61%, 0.98% in superior grains, and 1.18%, 0.97% in inferior grains, both reduced the relative crystallinity and 1045/1022 cm(-1), thereby decreasing the stability of the starch crystalline region and the orderliness of starch granules. N-2 treatment reduced the Delta Hgel of two varieties. These changes ultimately contributed to the enhancement of the taste values in superior and inferior grains in both varieties, especially the inferior grains. Correlation analysis showed that the average starch volume diameter (D[4,3]) and relative crystallinity were significantly positively correlated with the taste value of superior and inferior sgrains, suggesting their potential use as an evaluation index for the simultaneous enhancement of the taste value of rice with superior and inferior grains.Discussion: Based on 150 kgN hm(-2), postponing N topdressing (basal fertilizer: tillering fertilizer: panicle fertilizer=3:1:6) promotes the enhancement of the overall taste value and provides theoretical information for the production of rice with high quality

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