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Updated: Dec 20, 2025
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A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses
Published on: January 25, 2018
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Soybean vegetative lipoxygenases are not vacuolar storage proteins
Glenn W Turner1, Howard D Grimes2, B Markus Lange1
1Institute of Biological Chemistry, Washington State University, Pullman, WA 99164-6340, USA.
Functional Plant Biology : FPB
|June 3, 2020
Summary
Soybean lipoxygenases (Vlx) are not found in storage vacuoles as previously thought. This study reveals VlxB, VlxC, and VlxD are located in the cytoplasm and nucleus of leaf cells, challenging their role as storage proteins.
Area of Science:
- Plant molecular biology
- Plant biochemistry
- Soybean physiology
Background:
- The paraveinal mesophyll (PVM) of soybean leaves contains vegetative storage proteins (Vspα and Vspβ).
- Five soybean vegetative lipoxygenase (Vlx) isozymes (VlxA-E) were hypothesized to co-localize with Vsps in PVM vacuoles.
- Previous studies reported conflicting tissue and subcellular localization data for Vlx isozymes.
Purpose of the Study:
- To precisely determine the subcellular localization of soybean Vlx isozymes.
- To investigate Vlx localization under sink-limited conditions.
- To evaluate the hypothesis of Vlx isozymes functioning as vegetative storage proteins.
Main Methods:
- Immuno-cytochemistry utilizing affinity-purified, isozyme-specific antibodies.
- Analysis of Vlx localization in soybean leaf cells during a sink limitation experiment.
Main Results:
- VlxB and VlxC were localized to the cytoplasm and nucleoplasm of PVM cells.
- VlxD was found in the cytoplasm and nucleoplasm of mesophyll chlorenchyma (MC) cells.
- No Vlx signal was detected in storage vacuoles or protein bodies.
Conclusions:
- The subcellular localization of VlxB, VlxC, and VlxD is primarily cytoplasmic and nuclear, not within storage vacuoles.
- These findings cast doubt on the proposed function of Vlx isozymes as vegetative storage proteins in soybean.
- Further research is needed to elucidate the actual function of Vlx isozymes in soybean.
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