Abstract
The present paper deals with the effects of osmotic potential of a medium on cell reproduction and elongation of the roots ofVicia faba L. andVicia sativa L. As the osmoticum polyethylene glycol (PEG 4000) in various concentrations ranging from 5 % to 25 % (i.e. fromca.-0.11 up to -1.27 MPa) has been used. The results show that at higher concentrations than 7.5 %, the growth of roots is slowed down and at the concentration of 25 % PEG this decrease in growth rate is as much as 6 fold compared with the control. The mitotic cycle is prolonged, however, only 1.86 times. Thus, the inhibition of root growth is caused mainly by the inhibition of cell elongation. Concerning the effect of high osmotic potential on mitotic cycle it was found that the roots after immersion into 25% PEG are able to overcome this osmotic stress and after 6 h to renew the mitotic activity. The S phase of the cycle is the most sensitive to this factor and even after mitotic activity was renewed it showed a slower rate in comparison with the control.
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Claims 6
Claim · model-written summary
PEG above 7.5% slowed root growth.
- Taxon
- Vicia faba L. andVicia sativa L.
Vicia fabae1 - Treatment
- polyethylene glycol (PEG 4000)e2
- Outcome
- growth of rootse0
- Direction
- slowed downe0
- Value
- 7.5 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at higher concentrations than 7.5 %, the growth of roots is slowed down”
e1“roots ofVicia faba L. andVicia sativa L.”
e2“polyethylene glycol (PEG 4000)”
Claim · model-written summary
At 25% PEG, root growth rate was sixfold lower than control.
- Taxon
- Vicia faba L. andVicia sativa L.Vicia fabae1
- Treatment
- 25 % PEGe0
- Outcome
- growth ratee0
- Direction
- decreasee0
- Value
- 6 folde0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the concentration of 25 % PEG this decrease in growth rate is as much as 6 fold compared with the control”
e1“roots ofVicia faba L. andVicia sativa L.”
Claim · model-written summary
The mitotic cycle was prolonged 1.86 times under PEG stress.
- Taxon
- Vicia faba L. andVicia sativa L.Vicia fabae1
- Treatment
- polyethylene glycol (PEG 4000)e2
- Outcome
- mitotic cyclee0
- Direction
- prolongede0
- Value
- 1.86 timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mitotic cycle is prolonged, however, only 1.86 times”
e1“roots ofVicia faba L. andVicia sativa L.”
e2“polyethylene glycol (PEG 4000)”
Claim · model-written summary
Root growth inhibition was attributed mainly to inhibited cell elongation.
- Taxon
- Vicia faba L. andVicia sativa L.Vicia fabae1
- Outcome
- inhibition of root growthe0
- Qualifier
- inhibition of cell elongatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibition of root growth is caused mainly by the inhibition of cell elongation”
e1“roots ofVicia faba L. andVicia sativa L.”
Claim · model-written summary
After 6 hours in 25% PEG, root mitotic activity resumed.
- Taxon
- Vicia faba L. andVicia sativa L.Vicia fabae1
- Treatment
- 25% PEGe0
- Outcome
- renew the mitotic activitye0
- Value
- 6 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the roots after immersion into 25% PEG are able to overcome this osmotic stress and after 6 h to renew the mitotic activity”
e1“roots ofVicia faba L. andVicia sativa L.”
Claim · model-written summary
The S phase remained slower than control after mitotic activity resumed.
- Taxon
- Vicia faba L. andVicia sativa L.Vicia fabae1
- Treatment
- polyethylene glycol (PEG 4000)e2
- Outcome
- S phase of the cyclee0
- Direction
- slowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The S phase of the cycle is the most sensitive to this factor and even after mitotic activity was renewed it showed a slower rate in comparison with the control”
e1“roots ofVicia faba L. andVicia sativa L.”
e2“polyethylene glycol (PEG 4000)”
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