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Related Experiment Videos

Sink to source translocation in soybean.

A B Bennett1, B L Sweger, R M Spanswick

  • 1Section of Plant Biology, Division of Biological Sciences, Cornell University, Ithaca, New York 14853.

Plant Physiology
|February 1, 1984
PubMed
Summary

Nutrient movement from soybean seed coats to vegetative parts occurs via xylem, not phloem loading. This study clarifies transport pathways in reproductive soybean tissues.

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Area of Science:

  • Plant Physiology
  • Plant Biochemistry
  • Agricultural Science

Background:

  • Soybean (Glycine max) reproductive tissues are significant sinks for photosynthates.
  • The precise mechanisms of nutrient transport within soybean reproductive structures are not fully elucidated.
  • Understanding nutrient allocation is crucial for crop yield optimization.

Purpose of the Study:

  • To investigate the potential for phloem loading in soybean reproductive sink tissues, specifically the seed coat.
  • To differentiate between phloem and xylem transport pathways in nutrient movement from developing soybean seeds.

Main Methods:

  • Radioactive labeling of seed coat tissues with [(14)C]sucrose after embryo removal.
  • Surgical removal of developing embryos from soybean seed coats.
  • Phloem disruption using steam girdling above and below the labeled pod to assess transport pathways.

Main Results:

  • A small percentage (0.1%–0.5%) of [(14)C]sucrose translocated from labeled seed coats to vegetative plant parts.
  • Sink-to-source translocation from seed coats was largely unaffected by phloem disruption.
  • Phloem disruption completely inhibited [(14)C]sucrose translocation from mature leaves to developing fruits, confirming phloem functionality.

Conclusions:

  • Nutrient translocation from soybean seed coats to vegetative tissues occurs primarily through the xylem.
  • Phloem loading does not appear to be a significant process in soybean seed coat sink tissues.
  • The findings highlight distinct transport mechanisms for reproductive versus vegetative sinks in soybeans.

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