O.E. Ade-Ademilua
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LiveDNA: 234.2660
C.E.J. Botha
Not Available
ABSTRACT
The functionality of a well-developed cross-connected phloem supply between paired leaflets in peas and the subsequent connection to the petiole and the stem vascular supply was determined using the phloem mobile fluorophore 5,6-Carboxyfluorescein (5,6-CF). The fluorophore was applied routinely to one of a pair of leaflets. After incorporation within the mesophyll cells, 5,6-CF was first transported to the leaflet opposite the fed leaflet, irrespective of the leaflet pair being in a source, sink or sink to source transition state. In sink leaflets, the fluorochrome was transported between leaflet pairs across the cross connected nodal supply, without any visible transfer out of the compound leaf. In transition and source leaflets, the fluorochrome was transported first to the opposite leaflet of the pair before export via the axis took place. Present data shows strong evidence that transport across the vascular connections between leaflets is independent of the relationship between the fed leaf and other leaves within the phyllotaxy; or of the source to sink gradient. Our experiments further suggest and support the concept of a modular transport process, which ensures that re-allocation and balancing of assimilates occur between leaflets of the same physiological age, photosynthetic and transport status, thereby load balancing their local transport system, before exporting any available assimilate to other younger (sink) regions.
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How to cite this article
O.E. Ade-Ademilua and C.E.J. Botha, 2006. A Modular Supply and Load-balancing Mechanism Is a Prerequisite for Export in Compound Leaves of Pea Plants. American Journal of Plant Physiology, 1: 160-168.
DOI: 10.3923/ajpp.2006.160.168
URL: https://scialert.net/abstract/?doi=ajpp.2006.160.168
DOI: 10.3923/ajpp.2006.160.168
URL: https://scialert.net/abstract/?doi=ajpp.2006.160.168
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