Source-sink relations and kernel weight in maize inbred lines and hybrids: Responses to contrasting nitrogen supply levels

Hisse, Ignacio R.; D'andrea, Karina Elizabeth; Otegui, Marı́a Elena

doi:10.1016/j.fcr.2018.10.011

Cited by 48 publications

(15 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mean kernel weight was reduced under combined water/N stress (nw rep ) relative to NW rep (231 mg kernel -1 vs. 182 mg kernel -1 ; Table 4). Because kernel weight reductions occur when post-silking source-sink ratio declines (Borrás and Gambín, 2010; Hisse et al, 2019), it appears that N veg was unable to completely prevent deterioration in the source-sink ratio during grain-fill under combined post-silking N and water stress.…”

Section: Discussionmentioning

confidence: 99%

Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding

2019

View full text Add to dashboard Cite

During vegetative growth maize can accumulate luxury nitrogen (N) in excess of what is required for biomass accumulation. When post-silking N uptake is restricted, this luxury N may mitigate N stress by acting as an N reserve that buffers grain yield and maintains plant function. The objective of this study was to determine if and how luxury accumulation of N prior to silking can buffer yield against post-silking N and/or water stress in maize. In a greenhouse experiment, maize was grown in high (N veg ) and low (n veg ) N conditions during vegetative growth. The n veg treatment did not affect biomass accumulation or leaf area by silking but did accumulate less total N compared to the N veg treatment. The N veg treatment generated a reserve of 1.1 g N plant -1 . Plants in both treatments were then subjected to water and/or N stress after silking. 15 N isotope tracers were delivered during either vegetative or reproductive growth to measure N remobilization and the partitioning of post-silking N uptake with and without a luxury N reserve. Under post-silking N and/or water stress, yield was consistently greater in N veg compared to n veg due to a reduction in kernel abortion. The N veg treatment resulted in greater kernel numbers and increased N remobilization to meet grain N demand under post-silking N stress. Luxury N uptake at silking also improved leaf area longevity in N veg plants compared to n veg under post-silking N stress, leading to greater biomass production. While post-silking N uptake was similar across N veg and n veg , N veg plants partitioned a greater proportion of post-silking N to vegetative organs, which may have assisted with the maintenance of leaf function and root N uptake capacity. These results indicate that N uptake at silking in excess of vegetative growth requirements can minimize the effect of N and/or water stress during grain-fill.

show abstract

Section: Discussionmentioning

confidence: 99%

Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding

2019

View full text Add to dashboard Cite

show abstract

“…In particular, the increase in the maize grain-filling rate tended to be stronger with increased N input under high planting density (HD). The first grain-filling period (the lag grain-filling period) determines the potential kernel weight size ( Hisse et al, 2019 ). Our study showed that in this period, the effect of increased N input on the kernel weight (i.e., the demand of the sink) significantly increased and advanced the completion of the lag grain-filling period, especially under HD conditions ( Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

“…The grain-filling process can be divided into two stages: the first is the lag stage in which the kernel number and the potential kernel weight (size) are determined, and the second stage is the effective grain-filling stage in which the final kernel weight is established ( Jones et al, 1996 ; Gambín et al, 2006 ; Hisse et al, 2019 ). The final kernel weight is highly dependent on the accumulation of assimilates during the initial grain-filling stages, but under stressful environmental conditions (such as low nitrogen and high planting density), the limitations of the supply of assimilates seriously influence the initial grain-filling stages and reduce the final kernel weight ( Ouattar et al, 1987 ; Cirilo and Andrade, 1996 ; Gambín et al, 2006 ).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Supply Regulates Vascular Bundle Structure and Matter Transport Characteristics of Spring Maize Under High Plant Density

et al. 2021

View full text Add to dashboard Cite

Nitrogen (N) fertilizer application greatly enhances grain yield by improving dry matter accumulation and grain filling in spring maize. However, how N application rates regulate the vascular bundle structure, matter transport and grain filling of spring maize under a high planting density has been poorly understood thus far. In this study, we analyzed the relationship between grain filling, vascular bundle structure and matter transport efficiency (MTE) of spring maize in the field. Zhongdan909 (ZD909) was used as the experimental material in a 2-year field experiment from 2015 to 2016, and it was grown under different N levels (0, 150, and 300 kg N ha–1) applied to the grain-filling stage of plots with planting densities of 67,500 plants ha–1 (ND) and 90,000 plants ha–1 (HD). Nitrogen application significantly optimized the structure of the big and small vascular bundles. In particular, there was an increase in the total number of small vascular bundles in the peduncle and cob of the ear system, i.e., increases of 51.8% and 25.7%, respectively, and the proportions of small vascular bundles to the total number of vascular bundles in the peduncle and cob were significantly increased. The root bleeding sap and MTE of maize were significantly increased by N application under both ND and HD, as indicated by the significant increase in the rate of 13C-photosynthate allocation to grain and amount of postsilking dry matter at maturity. Moreover, N application greatly improved the mean grain-filling rate (Gmean) under ND and HD by 30.0% and 36.1%, respectively, and the grain-filling rate increased, leading to a distinct improvement in the grain sink at the grain-filling stage. We concluded that nitrogen application significantly optimized the vascular bundle structure of the ear system, increased the MTE and improved photosynthate distribution to the grain, ultimately enhancing the filling rate and grain yield.

show abstract

“…In maize, a sub-optimal N supply can decrease yield due to reductions in several key yield components, including the number of ears per plant (Monneveux et al, 2005), kernel number (KN) per ear (Uhart and Andrade, 1995;Andrade et al, 2002;Paponov et al, 2005b), and/or weight of individual kernels (Hisse et al, 2019). Numerous experiments have shown that KN per plant is the main determinant of yield.…”

Section: Introductionmentioning

confidence: 99%

Differential Regulation of Kernel Set and Potential Kernel Weight by Nitrogen Supply and Carbohydrate Availability in Maize Genotypes Contrasting in Nitrogen Use Efficiency

Paponov

Sambo

et al. 2020

Front. Plant Sci.

View full text Add to dashboard Cite

show abstract

Source-sink relations and kernel weight in maize inbred lines and hybrids: Responses to contrasting nitrogen supply levels

Cited by 48 publications

References 45 publications

Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding

Luxury Vegetative Nitrogen Uptake in Maize Buffers Grain Yield Under Post-silking Water and Nitrogen Stress: A Mechanistic Understanding

Nitrogen Supply Regulates Vascular Bundle Structure and Matter Transport Characteristics of Spring Maize Under High Plant Density

Differential Regulation of Kernel Set and Potential Kernel Weight by Nitrogen Supply and Carbohydrate Availability in Maize Genotypes Contrasting in Nitrogen Use Efficiency

Contact Info

Product

Resources

About