Journal Article

Plant hydraulic conductance measured by the high pressure flow meter in crop plants

Makoto Tsuda and Melvin T. Tyree

in Journal of Experimental Botany

Volume 51, issue 345, pages 823-828
Published in print April 2000 | ISSN: 0022-0957
Published online April 2000 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jexbot/51.345.823
Plant hydraulic conductance measured by the high pressure flow meter in crop plants

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A new high pressure flow meter (HPFM) method for measuring plant hydraulic conductances (K) was investigated to examine whether its results are comparable to those from a conventional evaporative flux (EF) method in crops. Hydraulic conductance (K) was measured by the two methods under quasi‐steady‐state conditions in six crops grown in pots: soybean (Glycine max L. Merr. cv. Tsurunoko daizu), sunflower (Helianthus annuus L. cv. Russian mammoth), kidney bean (Phaseolus vulgaris L. cv. Tsurunashi morocco), tomato (Lycopersicon esculentum Mill. cv. Sekai‐ichi), green pepper (Capsicum annuum L. cv. shishitou), and eggplant (Solanum melongena L. cv. Seiguro chunaga nasu). There was a 1 : 1 agreement between K values measured by the two methods for K values of whole plant, root and stem, and leaf under quasi‐steady‐state conditions. Leaf water potential (Ψleaf) and evaporative flux density (E) in sunflower was curvilinear, indicating whole plant K estimated by the EF method increased with increase of E. Predicted Ψleaf(=E divided by whole plant K measured by the HPFM method) agreed with measured Ψleaf. Diurnal changes were also found in K measured by the HPFM confirming that K changed in response to temperature and E. The HPFM revealed that variable conductance was located in all organs: roots, stems, petioles, and leaves. These observations indicated that the HPFM is valid for crops as well as for trees (as previously established by Tsuda and Tyree) and has advantages over the EF method because of the speed and ease of the HPFM method.

Keywords: Evaporative flux method; high pressure flow meter method; hydraulic conductance; root; shoot; water potential; variable conductance.

Journal Article.  3955 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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