indische lotosblume /nelumbo nucifera
sound installation
pflanzenklänge group exhibition, botanical garden, vienna

indische lotosblume /nelumbo nucifera is a sonification of the pathways of air circulation of the plant as described by s. vogel in the work " Contributions to the functional anatomy and biology of Nelumbonucifera (Nelumbonaceae)"

"The thermo-osmotically driven airstream that temporarily ventilates the plant bodyof Nelumbo nucifera, supplying rhizome and rootswith oxygen, takes its way through interconnectedcanals and caverns. The course of this circulation,starting with the uptake of gas through leafstomata and ending with its expulsion via thespecialized navel (‘‘central plate’’) of the leaves, aswell as organs regulating the circuit, were examinedusing anatomical, pneumatic, and silicone castingmethods. The aerenchyma of the peltate leaf,closely paralleling the nervature, is divided intofour separate domains: two mirroring lateral halvesincluding halves of the central plate, and each halfagain separated into an adaxial (basal) and abaxial(distal) sector. Gas absorbed by the adaxial sectorsflows through a definite pair of pipes down thepetiole into three lateral pairs of the eight maintubes of the horizontal shoot. There it passesseveral nodes with adjoining leaves, where homol-ogous ducts, arranged in series along the shoot,contribute to the gas flux in its basipetal course. Areverse gas flow, confined to another pair of caulinepipes and also arranged in series, enters in thenodes another pair of petiolar pipes that directlylead to the foliar central plates, where it is releasedthrough stomatal pores. These pores are three timesas large as the laminal stomata and control the gasrelease by opening and closing. Each abaxial leafsector is, apart from its ducts leading down the petiole, via a shortcut connected with the upstreampipes supplying the central plate, so that its aircircuit, when active, is only intralaminar and doesnot join the entirety of the system. The questionwhere, and how, the two downstreaming currentsmerge into the two upstreaming ones remainsunresolved. The structure of the two types of aircanal diaphragms, petiolar and nodal, are docu-mented by SEM."

this piece was featured on ö1 zeit-ton

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