Abstract
Plant cell elongation depends on the physical properties of the primary cell wall. Because xyloglucan endotransglycosylases (XETs) are enzymes that mediate cleavage and rejoining of the beta(1-4)-XG backbone of primary cell wall, they are potentially involved in cell elongation. In this paper, the growth of the barley coleoptile was related to the expression patterns of two genes from this family (hvEXT, hvXEB) in experiments where coleoptile elongation varied according to light/dark treatments in order to assess the potential role of these genes in cell elongation. In dark-grown and light-grown coleoptiles, growth rate variations were associated with altered levels of expression of hvEXT and hvXEB: they were higher in dark-grown than in light-grown seedlings, and decreased after 5 d in darkness, and after 4 d in continuous light. In 4-d-old seedlings, coleoptile elongation decreased significantly 4 h after the onset of a continuous white- light irradiation, and hvXEB and hvEXT mRNA levels decreased, respectively, 2 h and 4 h after the onset of white-light irradiation. Moreover, the distribution of hvXEB and hvEXT along the coleoptiles of 4-d-old dark-grown seedlings were different. Altogether, these results suggest a complex pattern of temporal and positional expression for the different genes of the XET-related family.
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Claims 6
Claim · model-written summary
Coleoptile growth rate and hvEXT expression were higher in dark-grown than light-grown barley seedlings and fell after five days of darkness.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Organ / stage
- coleoptilese0
- Gene
- hvEXTe0
- Outcome
- growth rate variationse0
- Direction
- highere0
- Value
- 5 de0
- Comparator
- light-grown seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In dark-grown and light-grown coleoptiles, growth rate variations were associated with altered levels of expression of hvEXT and hvXEB: they were higher in dark-grown than in light-grown seedlings, and decreased after 5 d in darkness, and after 4 d in continuous light”
t0“barley”
Claim · model-written summary
hvXEB expression and coleoptile growth were higher in darkness and decreased after four days of continuous light.
- Taxon
- barleyHordeum vulgaret0
- Gene
- hvXEBe0
- Outcome
- levels of expressione0
- Direction
- highere0
- Value
- 4 de0
- Comparator
- light-grown seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dark-grown and light-grown coleoptiles, growth rate variations were associated with altered levels of expression of hvEXT and hvXEB: they were higher in dark-grown than in light-grown seedlings, and decreased after 5 d in darkness, and after 4 d in continuous light”
t0“barley”
Claim · model-written summary
White-light irradiation significantly reduced coleoptile elongation after four hours.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- continuous white- light irradiatione0
- Outcome
- coleoptile elongatione0
- Direction
- decreasede0
- Value
- 4 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“coleoptile elongation decreased significantly 4 h after the onset of a continuous white- light irradiation”
t0“barley”
Claim · model-written summary
hvXEB mRNA decreased two hours after white-light irradiation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- white-light irradiatione0
- Gene
- hvXEBe0
- Outcome
- mRNA levelse0
- Direction
- decreasede0
- Value
- 2 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hvXEB and hvEXT mRNA levels decreased, respectively, 2 h and 4 h after the onset of white-light irradiation”
t0“barley”
Claim · model-written summary
hvEXT mRNA decreased four hours after white-light irradiation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- white-light irradiatione0
- Gene
- hvEXTe0
- Outcome
- mRNA levelse0
- Direction
- decreasede0
- Value
- 4 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hvXEB and hvEXT mRNA levels decreased, respectively, 2 h and 4 h after the onset of white-light irradiation”
t0“barley”
Claim · model-written summary
hvXEB and hvEXT had different distributions along dark-grown coleoptiles.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- coleoptilese0
- Gene
- hvXEB and hvEXTe0
- Outcome
- distribution of hvXEB and hvEXTe0
- Direction
- differente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the distribution of hvXEB and hvEXT along the coleoptiles of 4-d-old dark-grown seedlings were different”
t0“barley”
The same questions in other papers
radiation · growth · Hordeum vulgare (barley)Results differ
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- no effect
- positive
- positive
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See all 37 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.