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Journal of Plant Nutrition Volume 25, 2002 - Issue 7
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Original Articles

NUTRIENT DEPRIVATION AFFECTS XYLEM SAP FLOW AND WATER CHANNEL FUNCTION IN TOMATO PLANTS

Seong Hee Lee Division of Applied Plant Science, Biotechnology Research Institute, Chonnam National University, Kwangju, 500-757, South Korea
,
Gap Chae Chung Division of Applied Plant Science, Biotechnology Research Institute, Chonnam National University, Kwangju, 500-757, South KoreaCorrespondence[email protected]
,
Baik Ho Cho Division of Applied Plant Science, Biotechnology Research Institute, Chonnam National University, Kwangju, 500-757, South Korea
,
Ja Ock Guh Division of Applied Plant Science, Biotechnology Research Institute, Chonnam National University, Kwangju, 500-757, South Korea
&
Sang Ryong Suh Department of Agricultural Engineering, College of Agriculture, Chonnam National University, Kwangju, 500-757, South Korea
Pages 1407-1413 | Published online: 14 Feb 2007
 
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ABSTRACT

Heat-balance sap-flow gauge was used to measure xylem sap flow through the main stem of tomato (Lycopersicum esculentum Mill. cv. Young-Kwang) plants grown under nitrogen- or phosphorus-deficient nutrient solutions for nine days. Nitrogen deficient plants transported less sap than phosphorus deficient plants. Moreover, the effect of nitrogen deficiency on xylem sap flow was rapid, appearing within one day of treatment. Addition of mercury to nutrient solution induced immediate and drastic reduction in sap flow of both control and nutrient deprived plants. Subsequent use of dithiothreitol (DTT), however, did not recover sap flow in nutrient deprived plants. This suggests that the alteration in the characteristics of water channel was due to nutrient deficiencies.

ACKNOWLEDGMENTS

This work was supported by Korea Research Foundation Grant (KRF-99-005-00007). Critical review by Prof. E. Steudle, Universität Bayreuth, Germany, is appreciated.

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