Ammonium nutrition inhibits plant growth and nitrogen uptake in citrus seedlings

Chen, Huanhuan; Jia, Yamin; Xu, Haiyan; Wang, Yuwen; Zhou, Yi; Huang, Zeng-Rong; Yang, Lin-Tong; Li, Yán; Chen, Li‐Song; Guo, Jiuxin

doi:10.1016/j.scienta.2020.109526

Cited by 52 publications

(45 citation statements)

References 37 publications

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“…Plants show various responses to different N forms and application rates. For example, Chen et al (2020) studied the growth of citrus seedlings under different N rates and N forms and reported that its seedlings were susceptible to AN. Similarly, Zou et al (2020) studied the growth traits of Moso bamboo ( Phyllostachys edulis ) under the application of different N forms and reported that AN significantly promoted the growth traits more than NN.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is also well established that high N can cause oxidative damage to crop plants ( Chu et al, 2021 ). Therefore, the optimization of N rates, particularly when applying in different forms, is essential to reduce the damage caused by oxidative stress under high N ( Chen et al, 2020 ). Furthermore, the impacts of various N rates were also studied for invasive plant species.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Different Nitrogen Forms and Competitive Treatments on the Growth and Antioxidant System of Wedelia trilobata and Wedelia chinensis Under High Nitrogen Concentrations

et al. 2022

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Nitrogen (N) is one of the essential nutrients for plant growth. Appropriate application of N can improve the N use efficiency (NUE) and significantly promote plants’ growth. However, under N toxic conditions, the relationship between the growth and antioxidant system of invasive plants under different N forms and competitive treatments is not fully understood. Therefore, in this study, the performance of invasive species Wedelia trilobata and its native species Wedelia chinensis was evaluated under two sets of N forms and ratios, namely, NH4+-N(AN)/NO3–-N(NN) = 2:1 and NH4+-N(AN)/NO3–-N(NN) = 1:2 along with two intraspecific and interspecific competitions under without N and high N level of 15 g N⋅m–2 year–1, respectively. Data regarding the growth indices, antioxidant enzyme activities, including peroxidase (POD) and catalase (CAT), malondialdehyde (MDA), and proline contents were determined. Results showed that for competitive treatments, growth status was better for interspecific competition than intraspecific competition. The plant biomass of W. trilobata was significantly higher than that of W. chinensis. N significantly promoted the plants’ growth in terms of leaf area and biomass yield, and the antioxidant enzyme activities were significantly increased under a high N treatment than that of the control. Among N forms/ratios, ammonium N (AN)/nitrate N (NN) = 2:1 significantly enhanced the enzyme activity, particularly in W. trilobata. Furthermore, for intraspecific competition, MDA contents of W. trilobata were significantly decreased compared to that of W. chinensis. In conclusion, our results showed that W. trilobata adapted well under competitive conditions through better growth and antioxidant defense system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Different Nitrogen Forms and Competitive Treatments on the Growth and Antioxidant System of Wedelia trilobata and Wedelia chinensis Under High Nitrogen Concentrations

et al. 2022

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“…The 9). These results suggest the 4 mM nitrate concentrations in this experiment provided an appropriate level of N fertilization for bottle gourd rootstock-grafted watermelon seedlings, and appropriate N de ciency supply will not cause stress inhibition to the growth of watermelon seedlings, but may help to improve the NUE and promote the growth of watermelon seedlings (Chen et al 2020).…”

Section: Discussionmentioning

confidence: 68%

Grafting Improves Growth and Nitrogen-use Efficiency by Enhancing NO3- Uptake, Photosynthesis, and Gene Expression of Nitrate Transporters and Nitrogen Metabolizing Enzymes in Watermelon Under Low Nitrogen

Chen¹,

Guo²,

Wang³

et al. 2022

Preprint

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Background Excessive and insufficient application of N fertilizer can inhibit plant growth, reduce N-use efficiency (NUE) and lead to production reduction. Watermelon is an important crop that often restricted by inappropriate N supply. The study aims to test whether grafting with bottle gourd rootstock can improve NUE and growth performance of watermelon under low N and to clarify the underlying physiological mechanism. Methods Grafted (self-grafted and rootstock-grafted watermelon) and ungrafted (watermelon and bottle gourd) seedlings were tested respectively, and treated with 9 mM (normal condition) and 4 mM (low N condition) NO3--N concentrations for 18 days under hydroponic conditions.Results The growth and NUE of bottle gourd rootstock-grafted watermelon seedlings increased under low-nitrate, while decreased slightly in self-grafted seedlings compared with control. Rootstock-grafted plants had higher root morphological characteristics, NO3- uptake, photosynthesis, and NUE traits than self-grafted plants under low-nitrate. The expression of nitrate transporter genes NRT1.5 and NRT2.1, and N metabolizing enzyme genes NR, NiR, GS1 and GS2 of rootstock-grafted plants were significantly up-regulated at low-nitrate treatment, which may lead to increased NO3- uptake and metabolism.Conclusion The bottle gourd rootstock grafting can improve the growth and NUE of watermelon seedlings under low-nitrate treatment. The improved plant performance is attributed to the vigorous root systems and higher NO3- uptake of rootstock roots, and the enhanced N metabolism and photosynthetic capacity of scion leaves. Grafting with the bottle gourd rootstock may be beneficial to the efficient production of watermelon and economic application of N fertilizer.

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“…Root growth is sensitive to changes in the soil nutrient environment. For instance, ammonium nutrition inhibits root growth and nitrogen (N) absorption on citrus seedlings [6], while Arabidopsis thaliana modulates root N acquisition efficiency in response to the N demands of shoots [5]. One study suggests that fertigation with 50% of the recommended fertilizer could be most effective for enhancing the growth and N use efficiency (NUE) of rabbiteye blueberry [7].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fertilizers on Rabbiteye Blueberry (Vaccinium ashei Reade.) Root Distribution and Fruit Yield

Guo¹,

Liu²,

Shakeel³

et al. 2022

Phyton

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The root system plays an important role in the growth and development of blueberry. The aim of this study was to assess the impacts of different fertilizers on the root growth and root-yield relationship of blueberry to provide insight into the regulation of root growth and fruit yield by fertilizing from the perspective of the root system. Rabbiteye blueberry variety 'Britewell' as the test material, and six fertilizers, including BF, OR, CF, SF, HF, and RT were used in single-factor fertilization experiments to analyze the effects of different fertilizer treatments on the root morphology, root distribution, and fruit yield of blueberry. Fertilization overall increased the root length density and root surface area in most soil layers, and the RT treatment significantly increased the total root length density and total root surface area 98.6% and 98.5%, respectively, compared with a control lacking fertilizer. In addition, the effect of fertilization on the blueberry root system was mainly observed in the 0-20 cm layer. Fruit yield was positively correlated with total root length density and total root surface area, and negatively correlated with average root diameter. In summary, the SF and RT treatments increased the morphological indexes of the root system, particularly in the shallow soil layers, leading to an increase in blueberry fruit yield.

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Ammonium nutrition inhibits plant growth and nitrogen uptake in citrus seedlings

Cited by 52 publications

References 37 publications

Effects of Different Nitrogen Forms and Competitive Treatments on the Growth and Antioxidant System of Wedelia trilobata and Wedelia chinensis Under High Nitrogen Concentrations

Effects of Different Nitrogen Forms and Competitive Treatments on the Growth and Antioxidant System of Wedelia trilobata and Wedelia chinensis Under High Nitrogen Concentrations

Grafting Improves Growth and Nitrogen-use Efficiency by Enhancing NO3- Uptake, Photosynthesis, and Gene Expression of Nitrate Transporters and Nitrogen Metabolizing Enzymes in Watermelon Under Low Nitrogen

The Effects of Fertilizers on Rabbiteye Blueberry (Vaccinium ashei Reade.) Root Distribution and Fruit Yield

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