Abstract
Plant responses to herbivory include slow changes in growth patterns and biomass distribution. A recent study, however, showed that a convolvulaceous vine began twining sooner around a stake after 25% of the plant was defoliated (damaged). We evaluated whether this induced response is widespread within the Convolvulaceae, and made preliminary studies of its underlying mechanisms. Leaf damage was applied to seven twining vine species from the genera Convolvulus, Calystegia, and Ipomoea. We compared the twining rate (proportion of plants successfully climbing at a given time), growth rate, and twining geometry in the control and in damaged plants. We further evaluated the consequences of jasmonic acid application on the twining rate of Ipomoea purpurea (L.) Roth. Five out of the seven species tested showed an enhanced twining rate after leaf damage. Growth rate did not differ between damaged and undamaged plants in any species. The angle of ascent of the twining stem was lower in damaged plants during the first gyres. Jasmonic acid increased twining rate in I. purpurea, as did leaf damage. The induced twining was not due to increased growth, but to changes in the climbing process, and further mechanistic approaches should consider the jasmonate pathway. Induced twining may be common in the Convolvulaceae, and its occurrence in other families should be tested.
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Claims 7
Claim · model-written summary
Five of seven tested vine species had enhanced twining after leaf damage.
- Taxon
- ConvolvulaceaeConvolvulaceaet0
- Treatment
- leaf damagee0
- Outcome
- twining ratee0
- Direction
- enhancede0
- Value
- Five out of the seven speciese0
Not reportedComparator
Verbatim
e0“Five out of the seven species tested showed an enhanced twining rate after leaf damage”
t0“Convolvulaceae climbing plants”
Claim · model-written summary
Growth rate did not differ between damaged and undamaged vines.
Verbatim
e0“Growth rate did not differ between damaged and undamaged plants in any species”
t0“Convolvulaceae climbing plants”
Claim · model-written summary
Leaf damage lowered the angle of ascent during the first stem gyres.
- Taxon
- ConvolvulaceaeConvolvulaceaet0
- Treatment
- damaged plantse0
- Outcome
- angle of ascent of the twining steme0
- Direction
- lowere0
- Qualifier
- during the first gyrese0
Not reportedComparator
Verbatim
e0“The angle of ascent of the twining stem was lower in damaged plants during the first gyres”
t0“Convolvulaceae climbing plants”
Claim · model-written summary
Jasmonic acid increased the twining rate of I. purpurea.
- Taxon
- I. purpurea
Ipomoea purpureae0 - Treatment
- Jasmonic acide0
- Outcome
- twining ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jasmonic acid increased twining rate in I. purpurea”
Claim · model-written summary
Leaf damage also increased twining rate in I. purpurea.
- Taxon
- I. purpureaIpomoea purpureae0
- Treatment
- leaf damagee0
- Outcome
- twining ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jasmonic acid increased twining rate in I. purpurea, as did leaf damage”
Claim · model-written summary
The authors interpreted induced twining as arising from a changed climbing process rather than increased growth.
- Taxon
- ConvolvulaceaeConvolvulaceaet0
- Outcome
- induced twininge0
- Qualifier
- changes in the climbing processe0
Verbatim
e0“The induced twining was not due to increased growth, but to changes in the climbing process”
t0“Convolvulaceae climbing plants”
Claim · model-written summary
The authors recommended testing induced twining in other plant families.
- Taxon
- ConvolvulaceaeConvolvulaceaet0
- Outcome
- its occurrence in other families should be testede0
Verbatim
e0“its occurrence in other families should be tested”
t0“Convolvulaceae climbing plants”