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Nitro-oxidative metabolism during fruit ripening.

Francisco J Corpas1, Luciano Freschi2, Marta Rodríguez-Ruiz1

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Reactive oxygen and nitrogen species (ROS/RNS) play crucial signaling roles in the ripening of pepper and tomato fruits. Understanding nitro-oxidative metabolism offers insights into improving fruit quality and ripening regulation.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Agricultural Science

Background:

  • Pepper (Capsicum annuum L.) and tomato (Solanum lycopersicum L.) are globally significant Solanaceae fruits, rich in essential nutrients.
  • Fruit ripening involves complex metabolic and developmental changes, with tomato classified as climacteric and pepper as non-climacteric.
  • Reactive oxygen and nitrogen species (ROS/RNS) are increasingly recognized for their involvement in regulating fruit ripening processes.

Purpose of the Study:

  • To review the current understanding of nitro-oxidative metabolism during pepper and tomato fruit ripening.
  • To discuss the signaling functions of ROS/RNS in controlling fruit ripening.
  • To explore biotechnological applications for enhancing fruit ripening and nutritional quality.

Main Methods:

  • Literature review focusing on nitro-oxidative metabolism in fruit ripening.
  • Analysis of signaling roles of specific ROS/RNS molecules (H2O2, NO, etc.).
  • Exploration of post-translational modifications regulated by ROS/RNS.

Main Results:

  • ROS/RNS, including hydrogen peroxide (H2O2) and nitric oxide (NO), interact to regulate protein function via post-translational modifications.
  • These molecules are integral to the complex physiological process of fruit ripening in climacteric and non-climacteric fruits.
  • The concept of 'nitro-oxidative eustress' is proposed as a more fitting term for fruit ripening than 'nitro-oxidative stress'.

Conclusions:

  • Nitro-oxidative metabolism is a key regulator of fruit ripening in pepper and tomato.
  • Understanding these pathways can lead to improved fruit quality and yield through biotechnological interventions.
  • The proposed 'nitro-oxidative eustress' framework better describes the beneficial role of ROS/RNS in fruit development.