A passive two-band sensor of sunlight-excited plant fluorescence Rev.

The open photoacoustic cell technique was used to measure tomato leaves from plants with and without mycorrhizal fungi (Glomus fasciculatum). Based on measurement of the photobaric contribution of the photoacoustic signal, the exponential parameter of the diffusion behavior for this contribution was calculated. From this value, the oxygen diffusion coefficient was derived. The changes in the oxygendiffusion-coefficient-dependent exponential parameter are statistically significant ( p < 0.05) and are consistent with the expected benefits of mycorrhizal symbiosis. Potentially similar results obtained from the photothermal contribution are discussed.

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