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 [ 3 H]‐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
- Value
- 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
Label distribution did not differ between boron treatments.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- ‐Be0
- Outcome
- label distributione0
- Direction
- no differencee0
- Comparator
- +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no difference in label distribution between +/‐B root tips”
t0“sunflower”
Claim · model-written summary
Boron deficiency inhibited mitosis without completely stopping it.
- 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 root tips incorporated radioactive label comparably to controls through 72 hours.
- Taxon
- SUNFLOWERHelianthus annuust0
- Treatment
- boron‐deficiente0
- Outcome
- incorporate radioactive labele0
- Direction
- comparablee0
- Qualifier
- up to 72 hr of treatmente0
- Comparator
- the 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 the primary event and DNA synthesis and mitosis effects as secondary.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- boron deprivatione0
- Outcome
- effects of boron deprivation on 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“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”
The same questions in other papers
boron atom · growth · Helianthus annuus (common sunflower)Results differ
5 papers in the same direction as this paper · 33 in the opposite direction
- positive
- positive
- positive
35 papers more in this group
See all 39 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.