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Plant Growth Regulation

, Volume 86, Issue 1, pp 37–48 | Cite as

Differential effect of the nitrogen form on the leaf gas exchange, amino acid composition, and antioxidant response of sweet pepper at elevated CO2

  • María C. Piñero
  • Margarita Pérez-Jiménez
  • Josefa López-Marín
  • Plácido Varó
  • Francisco M. del Amor
Original paper

Abstract

It is well known that NH4+ used as the sole N source is toxic, and that the degree of toxicity depends on environmental factors. However, far too little is known about the effect of the use of different NO3/NH4+ ratios when the CO2 concentration [CO2] is high. Therefore, this work evaluates the extent to which the optimal form of the N-supply can increase growth at elevated CO2. Sweet pepper plants (Capsicum annuum L., cv. Melchor) were grown at ambient or elevated [CO2] (400 or 800 µmol mol−1) with a nutrient solution containing different NO3/NH4+ ratios (concentration percentages of 100/0, 100/0 plus foliar urea (100/U), 90/10, 50/50, or 25/75). The results show that a low dose of NH4+ (90/10) in combination with the elevated [CO2] had beneficial effects on the plants. These plants had greater growth, root respiration rates, water-use efficiency, and chlorophyll fluorescence. Additionally, total phenolic compounds and ascorbate peroxidase activity were affected differentially, while the amino acid profile was also altered. This study reveals the strong interaction between the N form and the [CO2] in relation to the uptake of N, which requires further analysis to establish better nutritional strategies for the future.

Keywords

Capsicum annuum L. Climate change Foliar urea Ammonium Nitrate 

Notes

Acknowledgements

M.C. Piñero is the recipient of a pre-doctoral fellowship from INIA. The authors thank Miguel Marín, for his technical assistance, and Dr. David J. Walker, for assistance with the correction of the English. This work was supported by the European Regional Development Fund (ERDF) 80%—Región de Murcia (FEDER 1420-07).

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • María C. Piñero
    • 1
  • Margarita Pérez-Jiménez
    • 1
  • Josefa López-Marín
    • 1
  • Plácido Varó
    • 2
  • Francisco M. del Amor
    • 1
  1. 1.Department of Crop Production and Agri-TechnologyInstituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA)MurciaSpain
  2. 2.Centro Integrado de Formación y Experiencias AgrariasTorre PachecoSpain

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