Distribution and accumulation of zinc and nitrogen in wheat grain pearling fractions in response to foliar zinc and soil nitrogen applications

doi:10.1016/S2095-3119(20)63491-8

摘要/Abstract

摘要：

提高小麦籽粒锌含量对缓解人类膳食中锌缺乏有重要作用。本研究在华北平原连续两年小麦生长季，评价了叶面喷施锌肥和土壤施用氮肥对小麦籽粒粉样中氮、锌累积、分配、氮素转运及其相互关系。结果表明，小麦籽粒中氮、锌主要累积在籽粒胚乳中心层，其含量由外到内呈逐渐减小趋势。土壤施氮显著提高了籽粒各粉样中氮含量，而叶面喷锌显著增加了种皮中氮含量；两种措施均能显著增加胚乳中心层中锌含量。叶面喷锌对籽粒中氮、锌分配的影响不显著，而施氮则能促进氮素向糊粉层、锌素向胚乳中心层的转运，提高植株地上部氮素向籽粒转运的数量，但对贡献率无影响。相关分析表明，籽粒及其粉样中氮含量与开花期和成熟期营养器官中氮含量显著正相关，而种皮和胚乳过渡层中氮含量与胚乳中心层中锌含量亦呈显著的正相关。因此，叶面喷锌和土壤施氮可有效地提高小麦产量和籽粒氮、锌含量，尤其是提高胚乳中的氮、锌含量，可作为解决锌缺乏的有效途径。

Abstract:

Increasing zinc (Zn) concentration in wheat grain is important to minimize human dietary Zn deficiency. This study aimed to investigate the effect of foliar Zn and soil nitrogen (N) applications on the accumulation and distribution of N and Zn in grain pearling fractions, N remobilization, and the relationships between nutrient concentration in the vegetative tissues and grain or its fractions in two cropping years in the North China Plain. The results showed a progressive decrease in N and Zn concentrations from the outer to the inner parts of grain, with most of the accumulation in the core endosperm. Foliar Zn application significantly increased N concentration in the pericarp, and soil N application increased N concentration in each grain fraction. Both treatments significantly increased core endosperm Zn concentration. Foliar Zn had no effect on grain N and Zn distribution. Soil N application made N concentrated in the aleurone, promoted Zn translocation to the core endosperm and also increased N remobilization and its efficiency from the shoot to the grain, but no improved contribution to grain was found. N concentration in grain and its fractions were positively correlated with N in vegetative organs at anthesis and maturity, while positive correlations were obtained between N concentration in the pericarp and progressive central area of the endosperm and Zn concentration in the core endosperm. Thus, foliar Zn and soil N applications effectively increased yield and N and Zn concentrations in the wheat grain, particularly in the endosperm, and could be promising strategies to address Zn deficiency.

Key words: foliar Zn application , soil N application , winter wheat , nutrient distribution , N remobilization

. [J]. Journal of Integrative Agriculture, 2021, 20(12): 3277-3288.

ZHANG Pan-pan, CHEN Yu-lu, WANG Chen-yang, MA Geng, LÜ Jun-jie, LIU Jing-bao, GUO Tian-cai. Distribution and accumulation of zinc and nitrogen in wheat grain pearling fractions in response to foliar zinc and soil nitrogen applications[J]. Journal of Integrative Agriculture, 2021, 20(12): 3277-3288.

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