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We present a semi- in vitro  chemotropism assay that can be used to evaluate the chemoattractant effect of diffusible plant signaling molecules on growing pollen tubes. We constructed an array of microslit channels in a microfluidic device that prevented the passage of randomly growing pollen tubes but permitted ones that are responsive to the chemoattractant. Depending on the microslit channel size, 80%–100% of the randomly growing  Torenia fournieri  pollen tubes were excluded from reaching the source of the attractant. Thus, the selection of pollen tubes that are capable of responding to chemoattractants from a mixed population can be realized using this platform.

Quantitative assessment of chemotropism in pollen tubes using microslit channel filters