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Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions
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Published on: November 6, 2016

Membrane chemical stability and seed longevity.

Elena A Golovina1, Henk Van As, Folkert A Hoekstra

  • 1Laboratory of Plant Physiology, Wageningen University, 6703 BD Wageningen, The Netherlands. elena.golovina@wur.nl

European Biophysics Journal : EBJ
|October 14, 2009
PubMed
Summary

Seed longevity in tomatoes and onions depends on membrane surface chemical stability, not just immobilization. Chemical status differences explain why tomato seeds last longer than onion seeds.

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Area of Science:

  • Plant biology
  • Biophysics
  • Biochemistry

Background:

  • Seed longevity is crucial for agriculture and food security.
  • Membrane stability is a key factor in seed viability.
  • Understanding the chemical basis of seed aging is important for preservation.

Purpose of the Study:

  • To investigate the relationship between membrane surface chemical stability and seed longevity.
  • To compare the chemical stability of membrane surfaces in long-lived tomato and short-lived onion seeds.
  • To elucidate the role of the membrane environment's physical and chemical status in membrane surface chemical stability.

Main Methods:

  • Used 5-doxyl-stearic acid (5-DS) spin-labeling to assess membrane surface chemical stability in dry seeds.
  • Employed electron spin resonance (ESR) spectroscopy to monitor temperature-induced changes in 5-DS signal intensity.
  • Utilized model systems with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and Fourier transform infrared (FTIR) spectroscopy to study membrane dynamics and chemical stability.

Main Results:

  • Onion seeds showed irreversible loss of the 5-DS signal above 345 K, indicating decreased chemical stability, while tomato seeds did not.
  • In model systems, irreversible loss of the 5-DS signal occurred when POPC was embedded in a glucose matrix, suggesting sugar-induced chemical changes.
  • The chemical status of the membrane surface, rather than its immobilization, was identified as the primary determinant of differences in seed longevity.

Conclusions:

  • Differences in seed longevity between tomato and onion are attributed to variations in the chemical status of their membrane surfaces.
  • The chemical environment significantly impacts membrane surface stability and contributes to seed aging processes.
  • Findings provide insights into the molecular mechanisms underlying seed longevity and potential strategies for seed preservation.