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

doi:10.3390/agronomy8120302

	Carbohydrate Dynamics in Maize Leaves and Developing Ears in Response to Nitrogen Application
	Ning, Peng ; Peng, Yunfeng 2; Fritschi, Felix B.
	2018
发表期刊	AGRONOMY-BASEL
卷号	8 期号:12
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.
关键词	grain yield nitrogen nonstructural soluble carbohydrate (NSC) starch sucrose Zea mays L
学科领域	Agronomy ; Plant Sciences
DOI	10.3390/agronomy8120302
收录类别	SCI
语种	英语
WOS关键词	ZEA-MAYS-L ; GRAIN-YIELD ; METABOLISM ; SUCROSE ; KERNELS ; CARBON ; DEFICIENCY ; MOVEMENT ; STARCH ; GROWTH
WOS记录号	WOS:000454722400030
出版者	MDPI
文献子类	Article
出版地	BASEL
EISSN	2073-4395
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]
作者邮箱	ningp@nwafu.edu.cn ; pengyf@ibcas.ac.cn ; fritschif@missouri.edu
作品OA属性	gold, Green Submitted
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	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.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China 2.Ning, Peng; Peng, Yunfeng; Fritschi, Felix B.] Univ Missouri, Div Plant Sci, 1-31 Agr Bldg, Columbia, MO 65211 USA 3.Chinese Acad Sci, Inst Bot, Key Lab Vegetat & Environm Change, Beijing 100093, 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).

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