Claim · model-written summary
Overall root growth-rates were reduced during the phase of positive curvature.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Outcome
- overall root growth-ratese3
- Direction
- reducede3
- Qualifier
- During the phase of positive curvaturee3
Verbatim
e0“roots of Pisum sativum seedlings”
e3“During the phase of positive curvature overall root growth-rates were considerably reduced and were slowly restored to normal during recovery”
Title
L. J. AUDUS; M. E. BROWNBRIDGE Journal of Experimental Botany 1957. doi:10.1093/jxb/8.1.105
Other claims from this paper (13)
- Observation Positive curvature started at a maximum rate of 0.30–0.32 deg./min.
- Observation Positive curvature had a reaction time of 11.5 minutes.
- Observation Recovery was complete after a further 150–200 minutes at a similar rate of curvature.
- Intervention effect Low concentrations of both auxins increased the rate of positive curvature by 30–40 per cent.
- Intervention effect Low concentrations of both auxins shortened the reaction time roughly in proportion.
- Intervention effect Low concentrations of both auxins increased growth-rates of both sides of the root to the same extent.
- Intervention effect High concentrations of both auxins reduced the rates of curvature by 50 per cent.
- Intervention effect High concentrations of both auxins lengthened the reaction time.
- Intervention effect High concentrations of both auxins inhibited the growth of both sides of the root.
- Intervention effect Neither auxin concentration otherwise affected the time course of response and recovery.
- Mechanism Geotropic response is suggested to be due to de novo production of an endogenous inhibitor.
- Mechanism The inhibitor is suggested not to be indole-3-acetic acid or any similar compound.
- Mechanism Recovery may be largely independent of the inhibitor and auxins and due to another growth factor limiting cell length.