Abstract
Previous work has provided evidence that plants may require boron to maintain adequate levels of pyrimidine nucleotides, suggesting that the state of boron deficiency may actually be one of pyrimidine starvation. Since the availability of pyrimidine nucleotides is influenced by their rates of synthesis, salvage, and catabolism, we compared these activities in the terminal 3 centimeters of roots excised from boron-deficient and -sufficient squash plants (Cucurbita pepo L.). Transferring 5-day-old squash plants to a boron-deficient nutrient solution resulted in cessation of root elongation within 18 hours. However, withholding boron for up to 30 hours did not result in either impaired de novo pyrimidine biosynthesis or a change in the sensitivity of the de novo pathway to regulation by end product inhibition. Boron deprivation had no significant effect on pyrimidine salvage or catabolism. These results provide evidence that boron-deficient plants are not starved for uridine nucleotides collectively. Whether a particular pyrimidine nucleotide or derivative is limiting during boron deprivation remains to be examined.
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Claims 6
Claim · model-written summary
Boron deprivation stopped squash root elongation within 18 hours.
- Taxon
- squashe0
- Organ / stage
- roote0
- Treatment
- boron-deficient nutrient solutione0
- Outcome
- root elongatione0
- Direction
- cessatione0
- Value
- 18 hourse0
Not reportedComparator
Verbatim
e0“Transferring 5-day-old squash plants to a boron-deficient nutrient solution resulted in cessation of root elongation within 18 hours”
Claim · model-written summary
Withholding boron for up to 30 hours did not impair de novo pyrimidine biosynthesis.
- Taxon
- Squasht0
- Organ / stage
- Rootst0
- Treatment
- withholding boron for up to 30 hourse0
- Outcome
- de novo pyrimidine biosynthesise0
- Direction
- did not result in either impairede0
Not reportedComparator
Verbatim
e0“withholding boron for up to 30 hours did not result in either impaired de novo pyrimidine biosynthesis”
t0“Squash Roots”
Claim · model-written summary
Withholding boron for up to 30 hours did not change sensitivity of de novo pyrimidine biosynthesis to end product inhibition.
- Taxon
- Squasht0
- Treatment
- withholding boron for up to 30 hourse0
- Outcome
- sensitivity of the de novo pathway to regulation by end product inhibitione0
- Direction
- did not result in either impairede0
Not reportedComparator
Verbatim
e0“withholding boron for up to 30 hours did not result in either impaired de novo pyrimidine biosynthesis or a change in the sensitivity of the de novo pathway to regulation by end product inhibition”
t0“Squash Roots”
Claim · model-written summary
Boron deprivation had no significant effect on pyrimidine salvage.
- Taxon
- Squasht0
- Treatment
- Boron deprivatione0
- Outcome
- pyrimidine salvagee0
- Direction
- no significant effecte0
Not reportedComparator
Verbatim
e0“Boron deprivation had no significant effect on pyrimidine salvage or catabolism”
t0“Squash Roots”
Claim · model-written summary
Boron deprivation had no significant effect on pyrimidine catabolism.
Not reportedComparator
Verbatim
e0“Boron deprivation had no significant effect on pyrimidine salvage or catabolism”
t0“Squash Roots”
Claim · model-written summary
Boron deficient plants were not collectively starved for uridine nucleotides.
Verbatim
e0“boron-deficient plants are not starved for uridine nucleotides collectively”
t0“Squash Roots”
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See all 23 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.