Plants depend on gas exchanges with atmosphere for surviving. Indeed gas flow isdeterminant factor for main vital processes (photosynthesis and respiration). Measurementof gas (CO2 and Oxygen) exchange reflects the healthy state of plants. Photosynthesis isperformed in leaves, which make its determination independent of culture system. However,roots respiration depends on support texture. Indeed, monitoring of oxygen flow isinfluenced by soil texture and structure. In hydroponic systems, mainly aeroponic andsystems based on non sandy inert supports allowing easy air circulation (gravel, coconuthusk…), the measurement of oxygen flow is a “simple” manipulation using specificelectrodes and oxygen monitor related to root atmosphere both in closed of open systems.Jebara et al. (2001) reported differential response of symbiotic common bean (Phaseolusvulgaris) varieties to salt stress based on ability of nodules to maintain respiration understressful conditions.
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