Claim · model-written summary
A stimulus from an illuminated primary pulvinus to shaded secondary pulvini of the same leaf caused re-orientation of individual leaflets and the whole leaf.
- Taxon
- Macroptilium atropurpureum
Macroptilium atropurpureumt0 - Organ / stage
- shaded secondary pulvinie1
- Treatment
- illuminated primary pulvinuse1
- Outcome
- re-orientation of both individual leaflets and the whole leafe1
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The stimulus for movement was transmitted from an illuminated primary pulvinus to the shaded secondary pulvini of the same leaf, and this caused re-orientation of both individual leaflets and the whole leaf”
t0“Macroptilium atropurpureum cv. Siratro”
Title
Diaheliotropic Responses of Leaves of Macroptilium atropurpureum cv. Siratro
DW Sheriff; MM Ludlow Australian Journal of Plant Physiology 1985. doi:10.1071/pp9850151
Other claims from this paper (15)
- Intervention effect Secondary pulvini flexed more in response to light than primary pulvini.
- Intervention effect Blue light caused the illuminated side of the pulvinus to contract.
- Intervention effect Blue light reoriented the leaflet so that its adaxial surface faced the light.
- Intervention effect A light gradient along the illuminated surface of the pulvinus enhanced the leaf response to light.
- Intervention effect Additional low-intensity diffuse light enhanced the leaf response to light.
- Intervention effect A photon irradiance greater than 0.5 mmol m-2 s-1 enhanced the leaf response to light.
- Intervention effect A change of photon irradiance enhanced the leaf response to light.
- Intervention effect The abaxial surface of the pulvinus was more sensitive to light than its adaxial surface.
- Observation A stimulus from illuminated secondary pulvini or the adjacent petiole to the primary pulvinus caused deflection of the petiole and re-orientation of the whole leaf toward the light.
- Observation Secondary pulvini move individual leaflets in three dimensions.
- Observation Terminal leaflets showed greater three-dimensional movement than lateral leaflets.
- Association Movement of light through large angles produced leaflet re-orientation proportional to, but less than, the change in light angle.
- Observation Secondary pulvini caused leaflets to track, though imperfectly, a light source simulating the sun.
- Mechanism A circumnutational circadian rhythm is partly responsible for the diaheliotropic movements of Siratro leaves outdoors.
- Association A leaflet ability to track the sun depends on its orientation with respect to the sun.