Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize

IMR OpenIR

	Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize
其他题名	Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize
	Zhang Lili 1; Zhou Xiangli 3; Fan Ye 2; Fu Jun 2; Hou Peng 4; Yang Hailong 2; Qi Huai 1
	2019
发表期刊	JOURNAL OF INTEGRATIVE AGRICULTURE
ISSN	2095-3119
卷号	18 期号:8 页码:1882-1892
摘要	Stay green (SG) maize was found to have higher grain yield and post-silking nitrogen (N) uptake (PostN) compared with a non-stay green (NSG) hybrid. To understand the effects of plant density on grain yield (GY) and N efficiency in modern maize hybrids, we compared two modern hybrids (SG hybrid DY508 and NSG hybrid NH101) with similar maturity ratings at three plant densities (45 000, 60 000, and 75 000 pl ha(-1)) in 2014 and 2015. GY, leaf senescence, dry matter (DM) accumulation, N accumulation, PostN, and post-silking N remobilization (RemN) were analyzed. DY508 and NH101 had similar GY, but DY508 had higher thousand kernel weight (TKW) and lower kernel number (KN) than NH101. Plant density significantly increased GY in the two hybrids. On average, over the two years, plant density improved GY in DY508 and NH101 by 18.5 and 11.1%, respectively, but there were no differences in total dry matter (TDM) and post-silking DM (PostDM) between the two hybrids. Plant density improved leaf N, stem N, and grain N at the silking and maturity stages in 2014 and 2015. DY508 was lower in harvest index (HI), nitrogen harvest index (NHI), and grain N concentration (GNC) than NH101. Grain N in DY508 was 2.61 kg ha(-1) less than in NH101, and this was caused by lower GNC and leaf RemN. On the average, DY508 was 1.62 kg ha(-1) less in leaf remobilized N (leaf RemN) than NH101, but was similar in stem remobilized N (stem RemN; 2.47 kg ha(-1) vs. 3.41 kg ha(-1)). Maize hybrid DY508 shows delayed leaf senescence in the upper and bottom canopy layers in the later stages of growth. The present study provides evidence that the NH101, which has rapid leaf senescence at the late grain-filling stage, has gained equivalent GY and higher leaf RemN, and was more efficient in N utilization.
其他摘要	Stay green (SG) maize was found to have higher grain yield and post-silking nitrogen (N) uptake (PostN) compared with a non-stay green (NSG) hybrid. To understand the effects of plant density on grain yield (GY) and N efficiency in modern maize hybrids, we compared two modern hybrids (SG hybrid DY508 and NSG hybrid NH101) with similar maturity ratings at three plant densities (45 000, 60 000, and 75 000 pl ha~(–1)) in 2014 and 2015. GY, leaf senescence, dry matter (DM) accumulation, N accumulation, PostN, and post-silking N remobilization (RemN) were analyzed. DY508 and NH101 had similar GY, but DY508 had higher thousand kernel weight (TKW) and lower kernel number (KN) than NH101. Plant density significantly increased GY in the two hybrids. On average, over the two years, plant density improved GY in DY508 and NH101 by 18.5 and 11.1%, respectively, but there were no differences in total dry matter (TDM) and post-silking DM (PostDM) between the two hybrids. Plant density improved leaf N, stem N, and grain N at the silking and maturity stages in 2014 and 2015. DY508 was lower in harvest index (HI), nitrogen harvest index (NHI), and grain N concentration (GNC) than NH101. Grain N in DY508 was 2.61 kg ha~(–1) less than in NH101, and this was caused by lower GNC and leaf RemN. On the average, DY508 was 1.62 kg ha~(–1) less in leaf remobilized N (leaf RemN) than NH101, but was similar in stem remobilized N (stem RemN; 2.47 kg ha~(–1) vs. 3.41 kg ha~(–1)). Maize hybrid DY508 shows delayed leaf senescence in the upper and bottom canopy layers in the later stages of growth. The present study provides evidence that the NH101, which has rapid leaf senescence at the late grain-filling stage, has gained equivalent GY and higher leaf RemN, and was more efficient in N utilization.
关键词	GRAIN-YIELD STAY-GREEN GENETIC-IMPROVEMENT PHYSIOLOGICAL-BASIS DRY-MATTER HYBRIDS SENESCENCE RESPONSES CARBON METABOLISM maize N remobilization post-silking N uptake stay green plant density
收录类别	CSCD
语种	英语
资助项目	[National Key Research and Development Program of China] ; [National Natural Science Foundation of China] ; [National Basic Research Program of China (the 973 Program)]
CSCD记录号	CSCD:6560436
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/151348
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Dandong Acad Agr Science, Fengcheng 118109, Peoples R China 3.西北农林科技大学 4.Chinese Acad Agr Sci, Institute Crop Sci, Beijing 100081, Peoples R China Institute Crop Sci
推荐引用方式 GB/T 7714	Zhang Lili,Zhou Xiangli,Fan Ye,et al. Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize[J]. JOURNAL OF INTEGRATIVE AGRICULTURE,2019,18(8):1882-1892.
APA	Zhang Lili.,Zhou Xiangli.,Fan Ye.,Fu Jun.,Hou Peng.,...&Qi Huai.(2019).Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize.JOURNAL OF INTEGRATIVE AGRICULTURE,18(8),1882-1892.
MLA	Zhang Lili,et al."Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize".JOURNAL OF INTEGRATIVE AGRICULTURE 18.8(2019):1882-1892.