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Related Experiment Videos

Sugars and desiccation tolerance in seeds.

K L Koster1, A C Leopold

  • 1Field of Botany, Boyce Thompson Institute, Cornell University, Ithaca, New York 14853.

Plant Physiology
|November 1, 1988
PubMed
Summary

Soluble sugars, particularly sucrose, are crucial for maintaining seed desiccation tolerance. Their loss during germination leads to a loss of this protective ability in soybean, pea, and corn seeds.

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Area of Science:

  • Plant Physiology
  • Biochemistry

Background:

  • Soluble sugars are known to protect biological systems from desiccation.
  • Their role in seed desiccation tolerance is proposed but not fully elucidated.

Purpose of the Study:

  • To investigate the relationship between soluble sugar content and the loss of desiccation tolerance in germinating soybean, pea, and corn axes.
  • To identify specific sugars involved in maintaining desiccation tolerance.

Main Methods:

  • Monitoring germination after desiccation following varying imbibition periods.
  • Measuring electrolyte leakage from dried and rehydrated axes.
  • Analyzing soluble sugar content in axes during the transition from tolerance to intolerance.

Main Results:

  • Desiccation tolerance decreased as soluble oligosaccharides were lost from the axes.
  • Sucrose and larger oligosaccharides were present during the desiccation-tolerant stage.
  • The loss of oligosaccharides correlated with the loss of desiccation tolerance.

Conclusions:

  • Sucrose likely acts as the primary agent for desiccation tolerance in these seeds.
  • Larger oligosaccharides may prevent sucrose crystallization, enhancing its protective function.

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