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Role of phloem in sucrose transport by Ricinus cotyledons
1Institut für Botanik, Fachbereich Biologie und Vorklinische Medizin der Universität Regensburg, Universitätsstra\e 31, D-8400, Regensburg, Federal Republic of Germany.
Planta
|December 7, 2013
Summary
Ricinus communis cotyledons primarily accumulate sucrose in the phloem. This sucrose is exported via mass flow, providing evidence for proton-sucrose symport in phloem loading.
Area of Science:
- Plant physiology
- Biochemistry
- Molecular biology
Background:
- Plant cotyledons are crucial for nutrient storage and transport.
- Understanding sucrose transport mechanisms is vital for plant development.
Purpose of the Study:
- To investigate the mechanism of sucrose uptake and accumulation in Ricinus communis cotyledons.
- To determine the pathway and mechanism of sucrose export from cotyledons.
Main Methods:
- Autoradiography was used to track sucrose accumulation.
- Analysis of sucrose distribution within cotyledon tissues.
- Investigated mass flow in phloem for sucrose export.
Main Results:
- Sucrose is predominantly accumulated in the phloem of Ricinus communis cotyledons.
- Sucrose export from cotyledons to hypocotyl and roots occurs via phloem mass flow.
- Experimental data supports proton-sucrose symport as the phloem loading mechanism.
Conclusions:
- Proton-sucrose symport is the primary mechanism for phloem loading in Ricinus communis cotyledons.
- Sucrose transport in plants involves specific pathways and mechanisms for efficient distribution.
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