HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Bartholomew, D. P. Articles by Kadzimin, S. B. Search for Related Content PubMed Articles by Bartholomew, D. P. Articles by Kadzimin, S. B. Agricola Articles by Bartholomew, D. P. Articles by Kadzimin, S. B.

Porometer Cup to Measure Leaf Resistance of Pineapple¹

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 (r_e) 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 r_e 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.

Key Words: Diffusion resistance porometer • Leaf diffusion resistance • Stomatal resistance • Ananas comosus (L.) Merr.

² Assistant agronomist, Univ. of Hawaii; and instructor, Univ. of Agric. Malaysia. Sungei Besi, Selangor, Malaysia.

Received for publication November 22, 1975.

This article has been cited by other articles:

				D. L. Marzola and D. P. Bartholomew Photosynthetic Pathway and Biomass Energy Production Science, August 10, 1979; 205(4406): 555 - 559. [Abstract] [PDF]