Water Balance of Birch and Larch Leaves and Their Resistance to Short and Progressive Soil Drought

Water Balance of Birch and Larch Leaves and Their Resistance to Short and Progressive Soil Drought In a greenhouse experiment, which imitated a short (4-day-long) and progressive (3-week-long) soil drought, an infrared gas analyzer was employed to assess transpiration (mol/(m2 s)) and leaf transpiration conductivity (g w, mol H2O/(m2 s)) in intact one-year-old plants of Betula platyphylla Suk. and Larix gmelini (Rupr.) Rupr. grown at the saturation levels of photosynthetically active radiation. The drought duration did not affect the adaptation of leaf water balance, it was determined only by leaf temperature and water supply. At ample water supply and with all other conditions being equal, the transpiration of birch exceeded that of larch by the factor of 3; however, birch was less tolerant to soil drought. The authors conclude that water supply and leaf temperature determine plant resistance to soil drought. The species-specific drought resistance depends on the g w value. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Water Balance of Birch and Larch Leaves and Their Resistance to Short and Progressive Soil Drought

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Publisher
Springer Journals
Copyright
Copyright © 2004 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/B:RUPP.0000040758.45335.cd
Publisher site
See Article on Publisher Site

Abstract

In a greenhouse experiment, which imitated a short (4-day-long) and progressive (3-week-long) soil drought, an infrared gas analyzer was employed to assess transpiration (mol/(m2 s)) and leaf transpiration conductivity (g w, mol H2O/(m2 s)) in intact one-year-old plants of Betula platyphylla Suk. and Larix gmelini (Rupr.) Rupr. grown at the saturation levels of photosynthetically active radiation. The drought duration did not affect the adaptation of leaf water balance, it was determined only by leaf temperature and water supply. At ample water supply and with all other conditions being equal, the transpiration of birch exceeded that of larch by the factor of 3; however, birch was less tolerant to soil drought. The authors conclude that water supply and leaf temperature determine plant resistance to soil drought. The species-specific drought resistance depends on the g w value.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Dec 22, 2004

References

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