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Metabolism of cell wall polysaccharides in cell suspension cultures of Populus alba in relation to cell growth
Author(s) -
Kakegawa Koichi,
Edashige Yusuke,
Ishii Tadashi
Publication year - 2000
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1034/j.1399-3054.2000.t01-1-100412.x
Subject(s) - galactan , polysaccharide , cell wall , pectin , xyloglucan , biochemistry , chemistry , elongation , sugar , glucan , materials science , metallurgy , ultimate tensile strength
Changes in the composition of cell walls and extracellular polysaccharides (ECP) were studied during the growth of suspension‐cultured Populus alba cells. Three growth phases, namely the cell division phase, cell elongation phase and stationary phase, were distinguished. The active deposition of polysaccharides in cell wall fractions (50 m M Na 2 CO 3 ‐, 1 M KOH‐, 4 M KOH‐soluble and 4 M KOH‐insoluble) was observed during the elongation phase. A 50 m M Na 2 CO 3 ‐soluble pectic fraction mainly composed of 1,4‐linked galactan and arabinan except acidic sugars. The 1,4‐linked galactan decreased markedly during elongation. In 1 and 4 M KOH‐soluble hemicellulosic fractions, non‐cellulosic 1,4‐glucan and xyloglucan were observed as major components, respectively. These polysaccharides also decreased during elongation. A large amount of polysaccharides was secreted into the medium as ECP. Neutral sugars were detected predominantly by sugar composition analysis. Acidic sugars, such as galacturonic acid, were less than 12% of total. In this study, active metabolism of pectic polysaccharides in addition to hemicellulosic polysaccharides, especially neutral side chains of pectin, during cell growth, was clarified.