PMID: 16667043Sep 1, 1989Paper

Extracellular polysaccharides and proteins of tobacco cell cultures and changes in composition associated with growth-limiting adaptation to water and saline stress

Plant Physiology
N M IrakiN C Carpita


The chemical composition of extracellular polymers released by cells of tobacco (Nicotiana tabacum L. cv W38) adapted to a medium containing 30% polyethylene glycol 8000 (-28 bar) or 428 millimolar NaCl (-23 bar) was compared to the composition of those released by unadapted cells. Unadapted cells released uronic acid-rich material of high molecular weight, arabinogalactan-proteins, low molecular weight fragments of hemicellulosic polysaccharides, and a small amount of protein. Cells adapted to grow in medium containing NaCl released arabinogalactan and large amounts of protein but not the uronic acid-rich material, and cells adapted to grow in polyethylene glycol released only small amounts of an arabinogalactan of much lower molecular weight and some protein. Secretion of all material was nearly blocked by polyethylene glycol, but when cells were transferred to a medium containing iso-osmolar mannitol, they again released extracellular polymers at rates similar to those of unadapted cells. Like cells adapted to NaCl, however, these cells released arabinogalactan and large amounts of protein but only small amounts of the uronic acid-rich material. Media of NaCl-adapted cells were enriched in 40, 29, and 11 kilodalton polypepti...Continue Reading


Nov 1, 1969·Canadian Journal of Biochemistry·G O AspinallJ W Craig
Feb 1, 1987·Proceedings of the National Academy of Sciences of the United States of America·N K SinghR A Bressan
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Sep 1, 1985·Plant Physiology·M L BinzelR A Bressan
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