A dynamic regulation of nitrogen on floret primordia development in wheat

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外文摘要：Nitrogen(N)fertilization is critical for spike and floret development,which affects the number of fertile florets per spike(NFFs).However,the physiological regulation of the floret development process by N fer-tilization is largely unknown.A high temporal-resolution investigation of floret primordia number and morphology,dry matter,and N availability was conducted under three N fertilization levels:0(N0),120(N1)and 240(N2)kg ha-1.Interestingly,fertile florets at anthesis stage were determined by those floret primordia with meiotic ability at booting stage:meiotic ability was a threshold that predicted whether a floret primordium became fertile or abortive florets.Because the developmental rate of the 4th floret primordium in the central spikelet was accelerated and then they acquired meiotic ability,the NFFs increased gradually as N application increased,but the increase range decreased under N2.There were no differences in spike N concentration among treatments,but leaf N concentration was increased in the N1 and N2 treatments.Correspondingly,dry matter accumulation and N content of the leaf and spike in the N1 and N2 treatments was increased as compared to N0.Clearly,optimal N fer-tilization increased leaf N availability and transport of assimilates to spikes,and allowed more floret pri-mordia to acquire meiotic ability and become fertile florets,finally increasing NFFs.There was no difference in leaf N concentration between N1 and N2 treatment,whereas soil N concentration at 0-60 cm soil layers was higher in N2 than in N1 treatment,implying that there was still some N fertilization that remained unused.Therefore,improving the leafs ability to further use N fertilizer is vital for greater NFFs.

外文关键词：

Fertile floretsFloret primordiaGrain numberMeiotic abilityMorphological development

作者：

Zhen Zhang、Yujing Li、Yuxun Wu、Xiaoyu Zheng、Xiaolei Guo、Wan Sun、Zhencai Sun、Zhimin Wang、Yinghua Zhang

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作者单位：

College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China

College of Biological Sciences,China Agricultural University,Beijing 100193,China

Engineering Technology Research Center for Agriculture in Low Plain Areas,Cangzhou 061800,Hebei,China

基金：

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaEarmarked Fund for CARSNational Natural Science Foundation of ChinaChina Postdoctoral Science Foundation

项目编号：

2022YFD19007032022YFD2300802CARS-3318715632022M723437

出版年：

2024

DOI：

10.1016/j.cj.2023.10.009

作物学报(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.12(1)

参考文献量38