The lack of information on the response time and calibration characteristics of the available porometer leaf cups at high diffusive resistances caused us to design and construct a teflon porometer leaf cup suitable for measurement f the very high epidermal diffusive resistances (re) encountered with pineapple [Ananas comosus (L.) Merr.] The cup was calibrated to diffusive resistances near 200 sec cm−1 and calibration was linear throughout the range. Measurements on pineapple confirmed that this species has high midday re with values for field grown plants estimated to exceed 400 sec cm−1 on a day with full sun. Minimum resistances of 5 to 10 sec cm−1 were reached at about 1800 hours and early morning values were comparable until 2 to 3 hours after sunrise. The data suggest that the water economy of the pineapple plant is enhanced by increased diffusive resistance at higher levels of radiation and temperature.
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Bartholomew et al. (1976) studied this question.
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