What Does the Movement of the Phloem-mobile Symplastic Tracer, 5,6-carboxyfluorescein in shoots of Pisum Sativum L. Indicate - the Existence of a Symplastic Transport System? - A bid to Answer Some Puzzling Questions.

Ade-Ademilua, O.E. and Botha, C.E.J. (2006) What Does the Movement of the Phloem-mobile Symplastic Tracer, 5,6-carboxyfluorescein in shoots of Pisum Sativum L. Indicate - the Existence of a Symplastic Transport System? - A bid to Answer Some Puzzling Questions. American Journal of Plant Physiology, 1 (2). pp. 127-131. ISSN 1557- 4539

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Abstract

Like other members of the Fabaceae, the minor veins of Pisum are categorized as a closed system termed type 2 minor vein configuration due to the presence of few or no plasmodesmal connections between the sieve element-transfer cell complex (SE-TCC) and the adjacent cells (Gamalei, 1989; van Bel and Gamalei, 1991) Pisum is classified further into the category of type 2 b minor vein configuration due to the presence of transfer cells with the characteristic wall ingrowths in the minor vein phloem (Gamalei, 1989). According to van Bel et al. (1992), there is a correlation between minor vein configuration and phloem loading. However, by reason of low plasmodesmal frequency, the pathway of the flow of assimilates in plants with type 2 minor vein configuration is considered to be apoplasmic (Gamalei, 1989; van Bel and Gamalei, 1991). Therefore, present reports on the movement of phloem-mobile 5,6-carboxyfluorescein, a known symplamically transported compound between pea leaflets raises some doubts on the accession that transport within the phloem in pea is strictly apoplasmic. In this study we look at different points of arguments and try to offer our explanation and conclusions on the transport pathways that are likely to exist in Pisum.

Item Type:Article
Uncontrolled Keywords:Pisum sativum, pea, plasmodesmata
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Botany
ID Code:378
Deposited By: Ms Vivien Botha
Deposited On:10 May 2007
Last Modified:06 Jan 2012 16:18
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