Growth and nitrogen metabolism are associated with nitrogen-use efficiency in cotton genotypes

Iqbal, Asif; Dong, Qiang; Zhun, Wang; Wang, Xiangru; Gui, Heng; Zhang, Hengheng; Pang, Nianchang; Zhang, Xiling; Song, Meizhen

doi:10.1016/j.plaphy.2020.02.002

Cited by 84 publications

(133 citation statements)

References 98 publications

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“…Graphs were generated using GraphPad Prism 7, and PCA was calculated in OriginPro 2015 (b9.2.214, OriginLab Corporation, Northampton, MA, USA). Various studied traits were used to calculate the relationships with NUpE and NUtE using R package GeneNT [90], and the results were visualized according to the method of Iqbal et al [91].…”

Section: Discussionmentioning

confidence: 99%

Variations in Nitrogen Metabolism are Closely Linked with Nitrogen Uptake and Utilization Efficiency in Cotton Genotypes under Various Nitrogen Supplies

Iqbal

Dong

Wang

et al. 2020

Plants

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Cotton production is highly sensitive to nitrogen (N) fertilization, whose excessive use is responsible for human and environmental problems. Lowering N supply together with the selection of N-efficient genotypes, more able to uptake, utilize, and remobilize the available N, could be a challenge to maintain high cotton production sustainably. The current study aimed to explore the intraspecific variation among four cotton genotypes in response to various N supplies, in order to identify the most distinct N-efficient genotypes and their nitrogen use efficiency (NUE)-related traits in hydroponic culture. On the basis of shoot dry matter, CCRI-69 and XLZ-30 were identified as N-efficient and N-inefficient genotypes, respectively, and these results were confirmed by their contrasting N metabolism, uptake (NUpE), and utilization efficiency (NUtE). Overall, our results indicated the key role of shoot glutamine synthetase (GS) and root total soluble protein in NUtE. Conversely, tissue N concentration and N-metabolizing enzymes were considered as the key traits in conferring high NUpE. The remobilization of N from the shoot to roots by high shoot GS activity may be a strategy to enhance root total soluble protein, which improves root growth for N uptake and NUE. In future, multi-omics studies will be employed to focus on the key genes and pathways involved in N metabolism and their role in improving NUE.

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Section: Discussionmentioning

confidence: 99%

Variations in Nitrogen Metabolism are Closely Linked with Nitrogen Uptake and Utilization Efficiency in Cotton Genotypes under Various Nitrogen Supplies

Iqbal

Dong

Wang

et al. 2020

Plants

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“…Root growth will affect the above ground growth of the plant. Asif et al (2020) showed that the morphological characteristics of the root system may be an important feature for improving N use efficiency in cotton. Luo et al (2015) demonstrated that cotton root activity at a depth of 40-120 cm was significantly correlated with photosynthetic rate and was significantly affected by N levels.…”

Section: Introductionmentioning

confidence: 99%

“…Cotton plant heights reach110∼120 cm under this pattern, and this aboveground growth is different from to that seen in the cotton growing regions of northwest China, in the United States and in Australia. Previous studies were conducted in either polyvinyl chloride tubes (Luo et al, 2015;Chen Z. K. et al, 2018), greenhouses (Dong et al, 2008;Asif et al, 2020), or in a wheat-cotton intercropping system. It is unknown how N affects root growth and root distribution and how roots affect shoot biomass accumulation under various N application rates in field conduction under broad irrigation in the Yellow River Basin in China.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Fertilization Increases Root Growth and Coordinates the Root–Shoot Relationship in Cotton

et al. 2020

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The root system plays an important role in the growth and development of cotton, and root growth is closely related to shoot growth, both of which are affected by N availability in the soil. However, it is unknown how N affects root growth and the rootshoot relationship under various N rates in the Yellow River Basin, China. Thus, the aim of this study was to assess the impacts of the application rate of N on root growth and the root-shoot relationship, to provide insight into the N regulation of root and shoot growth and N efficiency from the perspective of the root system. A field experiment conducted in 2014 and 2015 was used to determine the effects of N rates (0, 120, 240, and 480 kg ha −1) on root morphology, root distribution, the root-shoot relationship, and cotton yield. A moderate N fertilization rate (240 kg ha −1) increased root length, root surface area, and root biomass in most soil layers and significantly increased total root growth and total root biomass by more than 36.06% compared to the 0 kg ha −1 treatment. In addition, roots in the surface soil layers were more strongly affected by N fertilization than roots distributed in the deeper soil layers. Total root length, total root surface area, and root biomass in the 0-15 cm layer were significantly correlated with shoot biomass and boll biomass. In the 60-75 cm layer, total root length, total root surface area, and root length were significantly positively correlated with seed cotton yield. The application of a moderate level of N markedly increased total shoot biomass, boll biomass, and seed cotton yield. Our results show that increased shoot and boll biomasses were correlated with a significant increase in the root system especially the shallow roots in the moderate N treatment (240 kg ha −1), leading to an increase in cotton seed yield.

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“…This report with a small panel of modern winter oilseed rape cultivars compared root phenotypes, field harvest and NUE components. Similar investigation sought to evaluate genotypic variation for root systems and NUE were successfully conducted in core sets of other crop species (Yang et al, 2019;Iqbal et al, 2020). To strengthen this pilot experiment, further studies with a larger diversity panel should assess yield stability in multi-environment trials and across N rates (Thorup-Kristensen and Kirkegaard, 2016;Stahl and Snowdon, 2018).…”

Section: Root Traits Observed At a Seedling Stage Are Predictors Of Fmentioning

confidence: 99%

Root Morphological Traits of Seedlings Are Predictors of Seed Yield and Quality in Winter Oilseed Rape Hybrid Cultivars

2020

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The root system is responsible for soil resources acquisition. Hence, optimizing crop root characteristics has considerable implications for agricultural production. This study evaluated a panel of twenty-eight European modern cultivars of oilseed rape (Brassica napus L.) cultivated in laboratory and field environments. Root morphology was screened using a high-throughput hydroponic growth system with two divergent nitrogen supplies. The panel showed an important diversity for biomass production and root morphological traits. Differences in root and shoot dry biomasses and lateral root length were mainly explained by the genotype, and differences in primary root length by nitrogen nutrition. The cultivars were tested in a pluriannual field trial. The field variation for yield and seed quality traits attributed to the genotype was more important than the year or the genotype × year interaction effects. The total root length measured at the seedling stage could predict the proportion of nitrogen taken up from the field and reallocated to seed organs, a component of the nitrogen use efficiency. The genetic interrelationship between cultivars, established with simple sequence repeat markers, indicated a very narrow genetic base. Positive correlations were found between the genetic distance measures, root morphological traits during nitrogen depletion and yield components. This study illustrates a root phenotyping screen in the laboratory with a proof of concept evaluation in the field. The results could assist future genetic improvements in oilseed rape for desirable root characteristics to reduce nutrient losses in the environment.

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Growth and nitrogen metabolism are associated with nitrogen-use efficiency in cotton genotypes

Cited by 84 publications

References 98 publications

Variations in Nitrogen Metabolism are Closely Linked with Nitrogen Uptake and Utilization Efficiency in Cotton Genotypes under Various Nitrogen Supplies

Variations in Nitrogen Metabolism are Closely Linked with Nitrogen Uptake and Utilization Efficiency in Cotton Genotypes under Various Nitrogen Supplies

Nitrogen Fertilization Increases Root Growth and Coordinates the Root–Shoot Relationship in Cotton

Root Morphological Traits of Seedlings Are Predictors of Seed Yield and Quality in Winter Oilseed Rape Hybrid Cultivars

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