Agronomic traits and physicochemical properties of starch of different grain positions in wheat spike under nitrogen treatment
Agronomic traits and physicochemical properties of starch of different grain positions in wheat spike under nitrogen treatment
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氮肥处理下小麦穗不同粒位淀粉农艺性状及理化特性
DOI：
10.1002/star.202100190
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发表时间：
2021-10
期刊：
影响因子：
2.3
通讯作者：
Fei Xiong
中科院分区：
文献类型：
--
作者：
Leilei Wang;Zhisheng Xu;Yong Zhang;Yuren Duan;Yumeng Zhang;Yunfei Wu;Xurun Yu;Gang Chen;Fei Xiong
氮素是影响小麦籽粒产量和品质的重要因素。然而，很少有人知道它对不同位置的籽粒在小穗。与对照相比，施氮显著提高了各部位籽粒的重量、淀粉含量和蛋白质含量。特别是扬麦13（YM 13）高粒位的蛋白质含量与烟农19（YN 19）在正常水平下的蛋白质含量相近。施氮显著提高了YN19第一粒（G1）和第二粒（G2）的淀粉小颗粒比例和平均聚合度（DP），但降低了表观直链淀粉含量（AAC）和崩解值（BV）。施氮显著提高了YM13 G1和G2的AAC、BV和DP，G1的AAC、小淀粉粒的体积比例和淀粉表面的有序结构。说明中氮水平有利于提高高位籽粒的农艺性状和低位籽粒淀粉的糊化特性。
Nitrogen is an important factor that influences the yield and quality of wheat grain. However, little is known about its effect on the different positions of the grain in spikelets. Compared with the control group, nitrogen application increased the weight, starch content, and protein content of grains in each position considerably. In particular, the protein content in high grain positions of Yangmai 13 (YM 13) under nitrogen treatment are similar to those positions in Yannong 19 (YN 19) under normal levels. Nitrogen application substantially increased the volume proportion of small starch granules and the average degree of polymerization (DP) but reduced the apparent amylose content (AAC), and the breakdown values (BV) of the first grain (G1) and the second grain (G2) in YN19. Nitrogen application considerably increased AAC, the volume proportion of small starch granules, and the ordered structure of starch surface of G1 and AAC, BV, and DP of G2 in YM13. These results demonstrated that a medium nitrogen level is conducive to increase the agronomic traits in high‐position grains and a better pasting properties of starch in low‐position grains.