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Stephen P. Long: Visionary, teacher, and doer.

Elizabeth A Ainsworth1,2, Donald R Ort1,2

  • 1Department of Plant Biology, University of Illinois, Urbana, IL 61801.

Proceedings of the National Academy of Sciences of the United States of America
|February 4, 2026
PubMed
Summary

Stephen Long

Area of Science:

  • Plant Science
  • Agricultural Science
  • Biotechnology

Background:

  • Photosynthesis research traditionally focused on molecular and cellular levels.
  • Understanding crop responses to environmental changes like rising CO2 and ozone is crucial for agriculture.
  • Previous understanding limited C4 photosynthesis to tropical and subtropical climates.

Purpose of the Study:

  • To advance photosynthesis knowledge through a multidisciplinary approach.
  • To investigate crop responses to atmospheric changes.
  • To engineer photosynthesis for increased crop yield and improved CO2 utilization.

Main Methods:

  • Integrated molecular, cellular, organismal, and ecological research.
  • Developed mathematical models and patented equipment for photosynthetic efficiency analysis.

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  • Utilized the world's largest open-air laboratory for crop response studies.

    • Main Results:

    • Demonstrated that C4 plants, like Miscanthus x giganteus, can thrive in cold climates.
    • Showed that maize can be adapted to cooler conditions, significantly increasing yield in the Corn Belt.
    • Fundamentally changed the understanding of crop responses to rising CO2 and ozone.

    Conclusions:

    • Stephen Long's research shifted the paradigm for C4 photosynthesis applicability.
    • His work provides new strategies for increasing agricultural productivity sustainably.
    • Pioneered engineering photosynthesis for enhanced crop performance in changing environments.