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Post-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize
Alternative TitlePost-silking nitrogen accumulation and remobilization are associated with green leaf persistence and plant density in maize
Zhang Lili1; Zhou Xiangli3; Fan Ye2; Fu Jun2; Hou Peng4; Yang Hailong2; Qi Huai1
2019
Source PublicationJOURNAL OF INTEGRATIVE AGRICULTURE
ISSN2095-3119
Volume18Issue:8Pages:1882-1892
AbstractStay 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.
Other AbstractStay 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.
KeywordGRAIN-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
Indexed ByCSCD
Language英语
Funding Project[National Key Research and Development Program of China] ; [National Natural Science Foundation of China] ; [National Basic Research Program of China (the 973 Program)]
CSCD IDCSCD:6560436
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/151348
Collection中国科学院金属研究所
Affiliation1.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
Recommended Citation
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.
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