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Biostimulants Improve Plant Growth and Bioactive Compounds of Young Olive Trees under Abiotic Stress Conditions

Author

Listed:
  • Giulia Graziani

    (Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy
    These authors contributed equally to this work.)

  • Aurora Cirillo

    (Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, Italy
    These authors contributed equally to this work.)

  • Paola Giannini

    (Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy)

  • Stefano Conti

    (Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, Italy)

  • Christophe El-Nakhel

    (Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, Italy)

  • Youssef Rouphael

    (Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, Italy)

  • Alberto Ritieni

    (Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy
    Unesco Health Education and Sustainable Development, 80131 Naples, Italy)

  • Claudio Di Vaio

    (Department of Agricultural Sciences, University of Naples Federico II, Via Università 100, 80055 Portici, Italy)

Abstract

The negative impacts of extreme heat and drought on olive plants have driven the quest for mitigation approaches based on the use of biostimulants, which have proved to be effective in contrasting environmental stresses. The aim of our study was to evaluate the effectiveness of six biostimulants in mitigating high temperature and water stress in young olive trees in terms of vegetative and eco-physiological parameters as well as bioactive compound content. Biostimulants based on glycine betaine and macro- and micro-algae effectively protected the plants from abiotic stress by improving their eco-physiological and vegetative parameters. At the end of the growing season, olive plants were experiencing water deficit which had built up through the summer months. At this time, the glycine betaine-treated plants had a three-fold higher stomatal conductance compared with the control, while plants sprayed with the seaweed mix had a relative water content 33% higher than the control. The kaolin treatment resulted in higher total phenolics and antioxidant activities (DPPH, FRAP and ABTS) in water stress conditions and caused an increase of 238.53 and 443.49% in leaves total polyphenols content in 100% and 50% water regime, respectively. This study showed the effectiveness of biostimulants in mitigating the damage from abiotic stress on young olive trees, by improving some vegetative, eco-physiological and leaf nutraceutical parameters. Further studies are needed to test the efficiency of these biostimulants in open field conditions on olive trees in full production.

Suggested Citation

  • Giulia Graziani & Aurora Cirillo & Paola Giannini & Stefano Conti & Christophe El-Nakhel & Youssef Rouphael & Alberto Ritieni & Claudio Di Vaio, 2022. "Biostimulants Improve Plant Growth and Bioactive Compounds of Young Olive Trees under Abiotic Stress Conditions," Agriculture, MDPI, vol. 12(2), pages 1-18, February.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:2:p:227-:d:742071
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    References listed on IDEAS

    as
    1. Luca Regni & Daniele Del Buono & Begoña Miras-Moreno & Biancamaria Senizza & Luigi Lucini & Marco Trevisan & Diletta Morelli Venturi & Ferdinando Costantino & Primo Proietti, 2021. "Biostimulant Effects of an Aqueous Extract of Duckweed ( Lemna minor L.) on Physiological and Biochemical Traits in the Olive Tree," Agriculture, MDPI, vol. 11(12), pages 1-14, December.
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    Cited by:

    1. Dario Priolo & Ciro Tolisano & Eleonora Ballerini & Monica Brienza & Daniele Del Buono, 2024. "Stimulatory Effect of an Extract of Lemna minor L. in Protecting Maize from Salinity: A Multifaceted Biostimulant for Modulating Physiology, Redox Balance, and Nutrient Uptake," Agriculture, MDPI, vol. 14(5), pages 1-13, April.
    2. Aurora Cirillo & Lucia De Luca & Giulia Graziani & Marco Cepparulo & Christophe El-Nakhel & Maria Giordano & Youssef Rouphael & Alberto Ritieni & Raffaele Romano & Claudio Di Vaio, 2022. "Biostimulants Application on Olea europaea L. in Mediterranean Conditions Increase the Production and Bioactive Compounds of Drupes and Oil," Agriculture, MDPI, vol. 12(12), pages 1-17, December.
    3. Agnieszka Lenart & Dariusz Wrona & Tomasz Krupa, 2022. "Health—Promoting Properties of Highbush Blueberries Depending on Type of Fertilization," Agriculture, MDPI, vol. 12(10), pages 1-11, October.

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    1. Daniele Del Buono & Luca Regni & Primo Proietti, 2023. "Abiotic Stresses, Biostimulants and Plant Activity," Agriculture, MDPI, vol. 13(1), pages 1-5, January.

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