Carbohydrate Dynamics in Maize Leaves and Developing Ears in Response to Nitrogen Application

doi:10.3390/agronomy8120302

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	Carbohydrate Dynamics in Maize Leaves and Developing Ears in Response to Nitrogen Application
	Ning, Peng ; Peng, Yunfeng 1; Fritschi, Felix B.
刊名	AGRONOMY-BASEL
	2018
卷号	8 期号:12
关键词	grain yield nitrogen nonstructural soluble carbohydrate (NSC) starch sucrose Zea mays L
DOI	10.3390/agronomy8120302
文献子类	Article
英文摘要	Maize grain yield is considered to be highly associated with ear and leaf carbohydrate dynamics during the critical period bracketing silking and during the fast grain filling phase. However, a full understanding of how differences in N availability/plant N status influence carbohydrate dynamics and processes underlying yield formation remains elusive. Two field experiments were conducted to examine maize ear development, grain yield and the dynamics of carbohydrates in maize ear leaves and developing ears in response to differences in N availability. Increasing N availability stimulated ear growth during the critical two weeks bracketing silking and during the fast grain-filling phase, consequently resulting in greater maize grain yield. In ear leaves, sucrose and starch concentrations exhibited an obvious diurnal pattern at both silking and 20 days after silking, and N fertilization led to more carbon flux to sucrose biosynthesis than to starch accumulation. The elevated transcript abundance of key genes involved in starch biosynthesis and maltose export, as well as the sugar transporters (SWEETs) important for phloem loading, indicated greater starch turnover and sucrose export from leaves under N-fertilized conditions. In developing ears, N fertilization likely enhanced the cleavage of sucrose to glucose and fructose in the cob prior to and at silking and the synthesis from glucose and fructose to sucrose in the kernels after silking, and thus increasing kernel setting and filling. At the end, we propose a source-sink carbon partitioning framework to illustrates how N application influences carbon assimilation in leaves, transport, and conversions in developing reproductive tissues, ultimately leading to greater yield.
学科主题	Agronomy ; Plant Sciences
电子版国际标准刊号	2073-4395
出版地	BASEL
WOS关键词	ZEA-MAYS-L ; GRAIN-YIELD ; METABOLISM ; SUCROSE ; KERNELS ; CARBON ; DEFICIENCY ; MOVEMENT ; STARCH ; GROWTH
语种	英语
出版者	MDPI
WOS记录号	WOS:000454722400030
资助机构	Natural Science Basic Research Plan in Shaanxi Province of China [2018JQ3072] ; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [Z109021713]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/20354]
专题	植被与环境变化国家重点实验室
作者单位	1.Ning, Peng; Peng, Yunfeng; Fritschi, Felix B.] Univ Missouri, Div Plant Sci, 1-31 Agr Bldg, Columbia, MO 65211 USA 2.Chinese Acad Sci, Inst Bot, Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Ning, Peng,Peng, Yunfeng,Fritschi, Felix B.. Carbohydrate Dynamics in Maize Leaves and Developing Ears in Response to Nitrogen Application[J]. AGRONOMY-BASEL,2018,8(12).
APA	Ning, Peng,Peng, Yunfeng,&Fritschi, Felix B..(2018).Carbohydrate Dynamics in Maize Leaves and Developing Ears in Response to Nitrogen Application.AGRONOMY-BASEL,8(12).
MLA	Ning, Peng,et al."Carbohydrate Dynamics in Maize Leaves and Developing Ears in Response to Nitrogen Application".AGRONOMY-BASEL 8.12(2018).