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http://dx.doi.org/10.5010/JPB.2002.29.1.041

Determination of the Period of the Formation and Size of Sieve Element Area and Sieve Pore  

Cho, Bong-Heuy (Department of Life Science, the University of Suwon)
Publication Information
Journal of Plant Biotechnology / v.29, no.1, 2002 , pp. 41-44 More about this Journal
Abstract
During the phloem development from parenchyma cells in a suspension culture of Streptanthus induced sucrose carrier and glucose carrier disappeared. Sieve element area and sieve pore induced suspension culture of Streptanthus were formed almost at the last period of the synthesis of sieve endoplasmic reticulum (SER) and p-protein. The new synthesized cell wall begann to digeste only after the new cell wall was surrounded by SER. The digested region of the cell wall and the formed region of sieve pore were regular comparatively. The completed sieve pore was an oval form, and the outer portion of sieve pore varied, ca 1.2 ${\mu}{\textrm}{m}$~1.6 ${\mu}{\textrm}{m}$ in longitudinal, 0.8 ${\mu}{\textrm}{m}$~1.3 ${\mu}{\textrm}{m}$ in tangential, and the inner size of sieve pore was irregular form of a star-like shape. The number of sieve pore between sieve cells was ca 2~7 per ${\mu}{\textrm}{m}$$^2$ and the sieve pore wall with callose was 0.05 ${\mu}{\textrm}{m}$~0.07 ${\mu}{\textrm}{m}$ in thickness. The energy for the formation of sieve element area and sieve pore might be supplied by mitochondria near the new cell wall and the role of SER remains to be illucidated.
Keywords
SER; sieve pore; sieve pore area; sieve pore size;
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