2002
DOI: 10.1007/s00425-001-0721-1
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Induction of (1→3,1→4)-*- D -glucan hydrolases in leaves of dark-incubated barley seedlings

Abstract: When seedlings of barley (Hordeum vulgare L.) were transferred from a natural light/dark cycle into darkness, (1-->3,1-->4)-beta- D-glucan endohydrolase (EC 3.2.1.73) activity in leaf extracts increased 3- to 4-fold after 2 days. Activity decreased to normal levels within a day if the light/dark cycle was restored. Although there are two (1-->3,1-->4)-beta-D-glucan endohydrolase isoenzymes in barley, the increased enzyme activity in dark-grown seedlings was attributable entirely to increases in isoenzyme EI. N… Show more

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Cited by 65 publications
(57 citation statements)
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“…Similar developmental patterns have been observed in the coleoptiles of other species, where (1 fi 3,1 fi 4)-b-Dglucan begins to decline in total amount at or just before elongation ceases (Inouhe and Nevins 1998;Kim et al 2000). Several (1 fi 3,1 fi 4)-b-D-glucan endo-and exohydrolases are probably responsible for the hydrolysis of the (1 fi 3,1 fi 4)-b-D-glucan during both the growth and maturation phases of coleoptile wall development (Thomas et al 2000;Inouhe and Nevins 1988;Kim et al 2000;Harvey et al 2001;Roulin et al 2002). One might conclude from these observations that in addition to the turnover of (1 fi 3,1 fi 4)-b-D-glucan that occurs during the elongation phase of growth (Gibeaut and Carpita 1991;Herrera et al 1989), the wall (1 fi 3,1 fi 4)-b-D-glucans can be converted to glucose as a source of energy during the maturation phase of coleoptile development (Gibeaut and Carpita 1991;Roulin et al 2002).…”
Section: Discussionmentioning
confidence: 97%
“…Similar developmental patterns have been observed in the coleoptiles of other species, where (1 fi 3,1 fi 4)-b-Dglucan begins to decline in total amount at or just before elongation ceases (Inouhe and Nevins 1998;Kim et al 2000). Several (1 fi 3,1 fi 4)-b-D-glucan endo-and exohydrolases are probably responsible for the hydrolysis of the (1 fi 3,1 fi 4)-b-D-glucan during both the growth and maturation phases of coleoptile wall development (Thomas et al 2000;Inouhe and Nevins 1988;Kim et al 2000;Harvey et al 2001;Roulin et al 2002). One might conclude from these observations that in addition to the turnover of (1 fi 3,1 fi 4)-b-D-glucan that occurs during the elongation phase of growth (Gibeaut and Carpita 1991;Herrera et al 1989), the wall (1 fi 3,1 fi 4)-b-D-glucans can be converted to glucose as a source of energy during the maturation phase of coleoptile development (Gibeaut and Carpita 1991;Roulin et al 2002).…”
Section: Discussionmentioning
confidence: 97%
“…In some tissues, the levels of (1, In related work, Roulin et al (2002) reported that when barley seedlings were transferred into darkness, the (1,3;1,4)-b-D-glucan content of leaf cell walls decreased by about 30% and that this was associated with increased levels of (1,3;1,4)-b-D-glucan endohydrolase isoenzyme EI and b-D-glucan glucohydrolases. The authors concluded that cell wall (1,3;1,4)-b-Dglucans might be remobilized in nonelongating, dark-incubated leaves and the Glc so generated could serve as an energy source under conditions of sugar depletion (Roulin et al, 2002).…”
Section: Biosynthesis Of (13;14)-b-d-glucans In the Grassesmentioning
confidence: 98%
“…The authors concluded that cell wall (1,3;1,4)-b-Dglucans might be remobilized in nonelongating, dark-incubated leaves and the Glc so generated could serve as an energy source under conditions of sugar depletion (Roulin et al, 2002).…”
Section: Biosynthesis Of (13;14)-b-d-glucans In the Grassesmentioning
confidence: 99%
“…They have been implicated in wall loosening during cell elongation, in wall remodeling, in defense reactions against fungal pathogens, in the release of Glc from wall polysaccharides as an energy source in darkgrown seedlings, and in the general recovery of Glc from different classes of polysaccharides and oligosaccharides Roulin et al, 2002).…”
Section: Introductionmentioning
confidence: 99%