Abstract

Streptanthus 조직배양 세포에서 유조직 세포로부터 사부 세포의 발달 동안 설탕 운반자는 유도되었고, 단당류인 포도당의 운반자는 사라졌다 (Cho 1998). Streptanthus 조직배양 세포에서 유도된 사부영역과 사공은 sieve endoplasmic reticulum (SER)과 p-protein 합성이 거의 완성되는 시기에 형성되며, SER이 새로 합성된 세포벽을 에워싼 후에 세포벽이 분해되기 시작하였다. 세포벽의 분해와 사공의 형성은 비교적 규칙적으로 진행되었다. 사공의 모양은 계란형이었고, 사공의 외부크기는 세로 1.2 <TEX>$\mu\textrm{m}$</TEX>~l.6 <TEX>$\mu\textrm{m}$</TEX>, 가로 0.8 <TEX>$\mu\textrm{m}$</TEX>~l.3 <TEX>$\mu\textrm{m}$</TEX>, 다양하고 사공의 내부크기는 별모양과 유사한 불규칙한 형태였다. 두 사부세포 사이에서 사공의 수는 <TEX>$\mu\textrm{m}$</TEX><TEX>$^2$</TEX>당 2개~7개였고, 육상체를 포함한 사공벽에 두께는 0.05 <TEX>$\mu\textrm{m}$</TEX>~0.07 <TEX>$\mu\textrm{m}$</TEX>,의 두꺼운 벽으로 구성되었다. 사공영역과 사공의 형성에 필요한 에너지는 세포벽 가까이에 위치하고 있는 미토콘드리아에서 얻을 것으로 추측하며, 사공 형성에 대한 SER의 역할은 아직까지 설명할 수 없었다. 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 <TEX>${\mu}{\textrm}{m}$</TEX>~1.6 <TEX>${\mu}{\textrm}{m}$</TEX> in longitudinal, 0.8 <TEX>${\mu}{\textrm}{m}$</TEX>~1.3 <TEX>${\mu}{\textrm}{m}$</TEX> 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 <TEX>${\mu}{\textrm}{m}$</TEX><TEX>$^2$</TEX> and the sieve pore wall with callose was 0.05 <TEX>${\mu}{\textrm}{m}$</TEX>~0.07 <TEX>${\mu}{\textrm}{m}$</TEX> 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.

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