Abstract
Boron deprivation has multiple effects upon root growth within 6 hr after this essential micronutrient is withheld. Root elongation is inhibited and this response has been attributed to a cessation of mitosis and DNA synthesis. Our preliminary results using an autoradiographic analysis of sunflower roots labeled with [3H]-thymidine demonstrated no difference in label distribution between +/-B root tips. We found that mitosis in inhibited in -B roots but does not completely cease. Scintillation counting of whole root tips shows that boron-deficient roots up to 72 hr of treatment incorporate radioactive label at a level comparable to that of the controls. Because mitosis and presumably DNA synthesis are affected by prolonged boron deficiency, these results may be brought about by a change in membrane integrity or permeability. We propose that effects of boron deprivation on DNA synthesis and mitosis in sunflower are secondary and that primary events involve alterations in cellular membranes.
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Claims 5
Claim · model-written summary
Boron deprivation inhibited root elongation within six hours.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- Boron deprivatione0
- Outcome
- Root elongatione0
- Direction
- inhibitede0
- Qualifier
- within 6 hre0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron deprivation has multiple effects upon root growth within 6 hr after this essential micronutrient is withheld. Root elongation is inhibited”
t0“Sunflower Root Tips”
Claim · model-written summary
Thymidine label distribution did not differ between boron deprived and control sunflower root tips.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Be0
- Outcome
- label distributione0
- Direction
- no differencee0
- Comparator
- root tipse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower roots labeled with [3H]-thymidine demonstrated no difference in label distribution between +/-B root tips”
Claim · model-written summary
Mitosis was inhibited but continued in boron deficient sunflower roots.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- -Be0
- Outcome
- mitosise0
- Direction
- inhibitede0
- Qualifier
- does not completely ceasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mitosis in inhibited in -B roots but does not completely cease”
t0“Sunflower Root Tips”
Claim · model-written summary
Boron deficient sunflower root tips incorporated radioactive label at levels comparable to controls up to 72 hours.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- boron-deficiente0
- Outcome
- incorporate radioactive labele0
- Direction
- comparablee0
- Qualifier
- up to 72 hr of treatmente0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“boron-deficient roots up to 72 hr of treatment incorporate radioactive label at a level comparable to that of the controls”
t0“Sunflower Root Tips”
Claim · model-written summary
The authors propose membrane alterations as primary effects of boron deprivation in sunflower.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- boron deprivatione0
- Outcome
- DNA synthesis and mitosise0
- Qualifier
- primary events involve alterations in cellular membranese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“effects of boron deprivation on DNA synthesis and mitosis in sunflower are secondary and that primary events involve alterations in cellular membranes”
The same questions in other papers
boron atom · growth · Helianthus annuus (common sunflower)Results differ
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- positive
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See all 39 papers →boron atom · molecular: metabolites · Helianthus annuus (common sunflower)Positive and negative results
2 papers in the same direction as this paper · 5 reporting no difference from an alternative
- positive
- positive
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See all 8 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.