Crop Science Grow Your Career with CSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 16:184-190 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Baughn, J. W.
Right arrow Articles by Tanner, C. B.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Baughn, J. W.
Right arrow Articles by Tanner, C. B.
Agricola
Right arrow Articles by Baughn, J. W.
Right arrow Articles by Tanner, C. B.

Excision Effects on Leaf Water Potential of Five Herbaceous Species1

J. W. Baughn and C. B. Tanner2

Dewpoint hygrometers were used to compare the in situ water potential of a leaf with the potential of a tissue piece excised from the same leaf and measured either by a hygrometer or psychrometer. Excised tissue potential was found to average 1.0 to 3.0 bars lower (drier), depending on species and water potential range, than the in situ potential for potato (Solanum tuberosum L.), sunflower (Helianthus annuus L.), pepper (Capsicum annuum L.), and soybean (Glycine max L.). With oat (Avena sativa L.) the potential increased after the tissue was excised. Internal tissue changes following excision contributed significantly to the potential changes in oat and soybean. Internal changes could not be separated from tissue drying for the other three species. Loss of tissue water during sample preparation and confinement in sample holder was superimposed on the internal shifts; drying losses appeared greatest for the psychrometer, on the average.

All our data were obtained on glasshouse-grown plants, so there is no immediate extrapolation of our data to field-grown plants, nor to other species. It is clear, however, that water potential methods requiring excised tissue are liable to incur significant errors from the excision, especially in the wet range where such errors can be relatively large.

Key Words: Leaf hygrometer • Psychrometer • Solanum tuberosum • Helianthus annuus • Capsicum annuum • Glycine max • Avena sativa

1 Contribution from the Dep. of Soil Science, Univ. of Wisconsin-Madison. Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin, Madison, WI 53706, and by USDA Hatch funds.

2 Research assistant (presently at U.W. University-Industry Research Program) and professor of Soil Science, Univ. of Wisconsin-Madison, respectively.

Received for publication June 28, 1975.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1976 by the Crop Science Society of America.