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Leafminers help us understand leaf hydraulic design
- Publication Year :
- 2010
-
Abstract
- Leaf hydraulics of Aesculus hippocastanum L. were measured over the growing season and during extensive leaf mining by the larvae of an invasive moth (Cameraria ohridella Deschka et Dimic) that specifically destroy the palisade tissue. Leaves showed seasonal changes in hydraulic resistance (R(lamina)) which were related to ontogeny. After leaf expansion was complete, the hydraulic resistance of leaves and the partitioning of resistances between vascular and extra-vascular compartments remained unchanged despite extensive disruption of the palisade by leafminers (up to 50%). This finding suggests that water flow from the petiole to the evaporation sites might not directly involve the palisade cells. The analysis of the temperature dependence of R(lamina) in terms of Q(10) revealed that at least one transmembrane step was involved in water transport outside the leaf vasculature. Anatomical analysis suggested that this symplastic step may be located at the bundle sheath where the apoplast is interrupted by hydrophobic thickening of cell walls. Our findings offer some support to the view of a compartmentalization of leaves into well-organized water pools so that the transpiration stream would involve veins, bundle sheath and spongy parenchyma, while the palisade tissue would be largely by-passed with the possible advantage of protecting cells from short-term fluctuations in water status.
- Subjects :
- Physiology
Water flow
Aesculus
Plant Science
Biology
Moths
Palisade cell
Petiole (botany)
Aesculus hippocastanum
suberin
Botany
Animals
Cameraria ohridella
bundle sheath
hydraulic architecture
leaf
Transpiration
Water transport
Temperature
Water
Plant Transpiration
Vascular bundle
Apoplast
Plant Leaves
Larva
Transpiration stream
Seasons
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....3df339a9b7ac01f80304b46b2803c68e