Abstract
Nitrate reduction, nitrite reduction, and ammonium assimilation were measured over c. 24 h in excised sterile barley roots, in air or under low oxygen tensions. Partial anoxia had relatively little effect, but the pathway of nitrogen assimilation was severely inhibited during complete anoxia, when the uptake of nitrate ceased. Much of the nitrate which was present in the roots at the time of excision was apparently unavailable for assimilation. None of the reactions of the pathway served in place of oxygen as an electron acceptor under anaerobic conditions. The concentration of nitrate in the external solution during growth and during the experimental treatments had no direct effect on anaerobic ethanol formation, although an indirect effect was noted which was due to variations in the carbohydrate content of the tissue.
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Claims 7
Claim · model-written summary
Partial anoxia had relatively little effect on barley root nitrogen assimilation.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- Partial anoxiae0
- Outcome
- effecte0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Partial anoxia had relatively little effect”
t0“Barley Roots”
Claim · model-written summary
Complete anoxia severely inhibited the pathway of nitrogen assimilation.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- complete anoxiae0
- Outcome
- pathway of nitrogen assimilatione0
- Direction
- severely inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pathway of nitrogen assimilation was severely inhibited during complete anoxia”
t0“Barley Roots”
Claim · model-written summary
Nitrate uptake ceased during complete anoxia.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- complete anoxiae0
- Outcome
- uptake of nitratee0
- Direction
- ceasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during complete anoxia, when the uptake of nitrate ceased”
t0“Barley Roots”
Claim · model-written summary
Much of the nitrate in roots at excision appeared unavailable for assimilation.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- rootse0
- Outcome
- unavailable for assimilatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Much of the nitrate which was present in the roots at the time of excision was apparently unavailable for assimilation”
t0“Barley Roots”
Claim · model-written summary
No nitrogen assimilation reaction substituted for oxygen as an electron acceptor anaerobically.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- served in place of oxygen as an electron acceptore0
- Qualifier
- under anaerobic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the reactions of the pathway served in place of oxygen as an electron acceptor under anaerobic conditions”
t0“Barley Roots”
Claim · model-written summary
External nitrate concentration had no direct effect on anaerobic ethanol formation.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- concentration of nitrate in the external solutione0
- Outcome
- anaerobic ethanol formatione0
- Direction
- no direct effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The concentration of nitrate in the external solution during growth and during the experimental treatments had no direct effect on anaerobic ethanol formation”
t0“Barley Roots”
Claim · model-written summary
External nitrate concentration indirectly affected anaerobic ethanol formation through tissue carbohydrate content.
- Taxon
- BarleyHordeum vulgaret0
- Compound
- carbohydratee0
- Outcome
- anaerobic ethanol formatione1
- Qualifier
- variations in the carbohydrate content of the tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an indirect effect was noted which was due to variations in the carbohydrate content of the tissue”
e1“anaerobic ethanol formation”
t0“Barley Roots”
The same questions in other papers
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See all 9 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.