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Sink to Source Transition of Pisum sativum Leaves in Relation to Leaf Plastochron Index

Author(s): O.E. Ade-Ademilua | C.E.J. Botha

Journal: American Journal of Plant Physiology
ISSN 1557-4539

Volume: 2;
Issue: 1;
Start page: 27;
Date: 2007;
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Keywords: Sink to source transition | leaf plastochron index (LPI) | sink | transition | source | 5 | 6-CF

The transition from a sink to a source state within developing leaves is synonymous with the maturation processes in leaves. We report on our investigation of the maturation of the first pair of leaflets on leaves of Pisum sativum L vis-à-vis the sink- source transition state, correlated to the leaf plastochron index. The study was carried out using the phloem-mobile fluorophore, 5,6-carboxyfluorescein (5,6-CF). Young leaves remain strong sinks until LPI 0 has been reached. The sink-to-source transition process then occurs until the leaf has reached LPI 1.8 and the transition of the leaflets to completely source state is completed by LPI 2.0. The sink to source transition in the pea plants takes place between LPI 0 and LPI 2.0 which represents 2.0 plastochrons or 4.68 days. Present results show that 1-2 leaves are simultaneously under transition in an intact plant. Present data provide convincing evidence that the leaf plastochron index is quantifiable and may be used to correlate the sink/source transition state in developing seedlings.
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